In-situ testing device for mechanical behavior of material under neutron and X-ray fusion imaging

Abstract

The invention discloses a material mechanical behavior in-situ testing device under neutron and X-ray fusion imaging, which belongs to the technical field of material mechanical behavior testing and comprises a mechanical loading testing module, a positioning supporting module, a variable-temperature loading module, an X-ray phase contrast imaging module and a neutron imaging module. X-ray phase contrast imaging is adopted, and the imaging sensitivity is high; the movable base can drive the space positions of the modules such as the test cassette and the neutron imaging module, and can match the neutron receiver to the same axis with the neutron traceability emitter, so that the problem that the neutron imaging module and the X-ray imaging module are difficult to integrate into one system is solved; in the mechanical loading process, the loading arm can drive the sample to rotate by 360 degrees, so that the X-ray phase contrast imaging module and the neutron imaging module can complete comprehensive scanning of the sample in the mechanical loading and heat loading processes of the sample; the problem that neutron and X-ray imaging and the loading process cannot be synchronously carried out due to space conflicts is solved.

Description

Technical Field

[0001] The invention relates to the technical field of material mechanical behavior testing, and in particular to an in-situ testing device for material mechanical behavior under neutron and X-ray fusion imaging. Background Art

[0002] With the development of science and technology, the requirements for the mechanical properties of materials under temperature fields, electromagnetic fields and complex mechanical loads have been significantly improved in many fields such as aerospace, deep-sea exploration, and automobile manufacturing. Advanced working condition simulation methods and imaging characterization technologies are the key to studying the structural properties of materials under service conditions and optimizing their processes. One of the most advanced characterization methods is neutron imaging and X-ray combined imaging. Both imaging methods can penetrate materials and image the internal structure of materials. For example, the National Institute of Standards and Technology of the United States, the Laue-Langevin Institute in France, and the Paul Scherrer Institute in Switzerland have successively developed neutron and X-ray absorption contrast imaging combined technology and equipment. However, there are currently three problems with the above-mentioned neutron and X-ray absorption contrast imaging combined technology and equipment: First, the imaging sensitivity of X-ray absorption contrast imaging is far inferior to that of X-ray phase contrast imaging, and the imaging quality is poor; second, the neutron tracer emitter is an extremely large device and cannot be moved, which makes it difficult to integrate X-ray imaging and neutron imaging into a system; third, due to spatial interference problems, when testing materials, mechanical loading or temperature loading can only be performed first, and then imaging can be performed. It is impossible to image the mechanical behavior of the material during the loading process, and the characterization accuracy is low. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned technical problems and to provide an in-situ testing device for the mechanical behavior of materials under neutron and X-ray fusion imaging, which adopts X-ray phase contrast imaging and has high imaging sensitivity. The spatial positions of modules such as the test cassette and the neutron imaging module can be moved by moving the base, so that the testing device can find the position of the neutron tracing emitter. There is no need to integrate the neutron tracing emitter and other modules into an integrated device, which can solve the problem that the neutron imaging module and X-ray imaging are difficult to integrate into a system. During the mechanical loading process, the loading arm can drive the sample to rotate 360°, so that the X-ray phase contrast imaging module and the neutron imaging module can complete a comprehensive scan of the sample during the process of mechanical loading and thermal loading of the sample, which solves the problem that neutron and X-ray imaging cannot be carried out synchronously with the loading process due to spatial conflicts.

[0004] To achieve the above object, the present invention provides the following solution: The present invention discloses an in-situ testing device for material mechanical behavior under neutron and X-ray fusion imaging, comprising:

[0005] A positioning support module, wherein the positioning support module comprises a mobile base capable of moving in space, a test cassette is arranged on the mobile base, a test cassette is arranged in the test cassette for testing a test area, a fixture entrance is arranged on the left and right sides of the test cassette, a line connecting the fixture entrances on the left and right sides of the test cassette passes through the test area, an X-ray outlet and an X-ray entrance are arranged on the top and bottom of the test cassette, a line connecting the X-ray outlet and the X-ray entrance passes through the test area, a neutron beam entrance and a neutron beam exit are arranged on the front and rear sides of the test cassette, a line connecting the neutron beam entrance and the neutron beam exit passes through the test area;

[0006] A mechanical loading test module, the mechanical loading test module comprising two loading arms that can rotate around their own axes, the two loading arms being mounted on the mobile base, and the two loading arms corresponding to the fixture entrances on the left and right sides of the test dark box respectively, the axes of the two loading arms being coaxial and arranged horizontally, an adjustable clamping distance being provided between the two loading arms, a clamp being provided on the loading arm and being located within the clamping distance, a pressure sensor being provided between the loading arm and the clamp, and the clamps of the two loading arms being used to clamp the two ends of the sample respectively;

[0007] A variable temperature loading module, used for controlling and monitoring the temperature of the sample, wherein the variable temperature loading module is arranged on the mobile base;

[0008] An X-ray phase contrast imaging module, comprising an X-ray transmitter and an X-ray receiver, wherein the X-ray transmitter and the X-ray receiver are mounted on the mobile base, and are respectively located below and above the test cassette, wherein the X-ray transmitter is used to transmit X-rays to the X-ray inlet, and the X-ray receiver is used to receive X-rays emitted by the X-ray outlet;

[0009] The neutron imaging module comprises a neutron beam receiver, which is mounted on the movable base and located behind the test cassette and is used to receive the neutron beam emitted from the neutron beam outlet.

[0010] Preferably, the positioning support module also includes a portal truss, the X-ray receiver is installed on the top of the portal truss, and the test dark box is installed on the mobile base through a support frame; the mobile base includes a bottom walking platform, a vertical moving platform, a longitudinal moving platform and a transverse moving platform, the bottom walking platform is placed on the ground through universal wheels with feet, the vertical moving platform is installed on the bottom walking platform through a height adjustment mechanism, the longitudinal moving platform is installed on the vertical moving platform through a horizontal longitudinal moving mechanism, the horizontal longitudinal direction is parallel to the clamping spacing size change direction, the transverse moving platform is installed on the longitudinal moving platform through a horizontal transverse moving mechanism, the horizontal transverse direction is perpendicular to the clamping spacing size change direction, and the portal truss, the support frame, and the loading arm are all arranged on the transverse moving platform.

[0011] Preferably, the height adjustment mechanism includes a height adjustment handwheel, an adjustment bearing seat, three gear boxes and four worm gear lifts, the four worm gear lifts are arranged in a rectangular shape on the bottom walking platform, the adjustment bearing seat is installed on the bottom walking platform, a rotating rod is rotatably connected to the adjustment bearing seat, the height adjustment handwheel is connected to the input port of one of the gear boxes through the rotating rod, two of the four worm gear lifts are a group of each other, and the output ports of the other two gear boxes connect two of the worm gear lifts in a group through transmission rods, and the two output ports of the gear box connected to the rotating rod are respectively connected to the input ports of the other two gear boxes through transmission shafts; the horizontal longitudinal movement mechanism includes a longitudinal adjustment seat, a longitudinal adjustment screw, a longitudinal adjustment handwheel and two A longitudinal linear guide rail is arranged horizontally and longitudinally, the longitudinal adjustment seat is fixedly connected to the vertical movable platform, the longitudinal adjustment screw is threadedly connected to the longitudinal adjustment seat, the longitudinal adjustment screw is arranged horizontally and longitudinally, the longitudinal adjustment handwheel is fixedly connected to the longitudinal adjustment screw, and the longitudinal adjustment screw is rotatably connected to the longitudinal movable platform; the horizontal longitudinal movable mechanism includes a transverse adjustment seat, a transverse adjustment screw, a transverse adjustment handwheel and two transverse linear guide rails arranged horizontally and transversely, the transverse adjustment seat is fixedly connected to the longitudinal movable platform, the transverse adjustment screw is threadedly connected to the transverse adjustment seat, the transverse adjustment screw is arranged horizontally and transversely, the transverse adjustment handwheel is fixedly connected to the transverse adjustment screw, and the transverse adjustment screw is rotatably connected to the transverse movable platform.

[0012] Preferably, the loading arm comprises a loading base, a mechanical turntable, a loading rod, a supporting bearing seat and an electric telescopic cylinder with a built-in grating, the loading base is mounted on the mobile base, the loading rod is arranged around the periphery of the cylinder body of the electric telescopic cylinder, one end of the loading rod is connected to the output end of the mechanical turntable through an adapter plate, the other end of the loading rod is fixedly connected to the inner ring of the supporting bearing in the supporting bearing seat, the supporting bearing seat is mounted on the mobile base, the cylinder body of the electric telescopic cylinder is fixedly connected to the inner ring of the supporting bearing, and the piston rod of the electric telescopic cylinder is connected to the clamp through the pressure sensor; The loading base includes an I-shaped steel plate, an L-shaped steel plate and a mounting bracket, the lower flange of the I-shaped steel plate is mounted on the movable base, the transverse plate section of the L-shaped steel plate is mounted on the upper flange of the I-shaped steel plate, the mechanical turntable is mounted on the transverse plate section of the L-shaped steel plate, the mechanical turntable abuts against the vertical plate section of the L-shaped steel plate, the mounting bracket is mounted on the transverse plate section of the L-shaped steel plate, and the support bearing seat is mounted on the transverse plate section of the L-shaped steel plate; the pressure sensor is fixed to the piston rod of the electric telescopic cylinder through a sensor fixing member, and the pressure sensor is connected to the clamp through a sensor fixing shaft.

[0013] Preferably, the clamp includes two semicircular sleeves that can be combined, and the semicircular sleeves include a first clamping end and a second clamping end. The first clamping end is used to be sleeved on the sensor fixing shaft, and the outer wall of the first clamping end is provided with a locking thread for threaded connection of a locking nut, and the inner wall of the second clamping end is provided with an arc-shaped limit plate. A sleeve opening that can be sleeved on the sample is provided between the arc-shaped limit plates of the two combined semicircular sleeves, and an anti-slip convex ring with a diameter larger than the sleeve opening is provided on the end of the sample.

[0014] Preferably, the variable temperature loading module is installed on the mobile base, and the variable temperature loading module includes a refrigeration unit, a heating unit and a temperature measuring unit. The refrigeration unit includes a nitrogen gas source. The test dark box is provided with a nitrogen inlet and a nitrogen outlet, and the nitrogen inlet is connected to the nitrogen gas source. The heating unit includes a power-carrying wire connected to a power supply. The clamp is an insulating clamp, and the insulating clamp is provided with a power-carrying wire inlet. The power-carrying wire extends into the insulating clamp through the power-carrying wire inlet, and the insulating clamp crimps the power-carrying wire to the sample. The temperature measuring unit is installed in the test dark box; the temperature measuring unit includes an infrared thermometer installed in the test dark box, and the test dark box is provided with a test wire inlet. The infrared thermometer is electrically connected to the external test wire through the test wire inlet.

[0015] Preferably, the X-ray phase contrast imaging module also includes a vertical linear slide, a vertical sliding block, a receiver mounting plate, and a transmitter mounting platform. The vertical linear slide is vertically installed on the top of the portal truss, the vertical sliding block is slidably connected to the vertical linear slide, the X-ray receiver is installed on the vertical linear slide through the receiver mounting plate, the transmitter mounting platform is installed on the mobile base, and the X-ray transmitter is installed on the transmitter mounting platform.

[0016] Preferably, the neutron imaging module also includes a transverse linear slide, a transverse sliding block, and a neutron mounting table. The neutron mounting table is installed on the movable base, the transverse linear slide is installed on the neutron mounting table, the transverse sliding block is slidably connected to the transverse linear slide, and the neutron beam receiver is installed on the transverse sliding block; the neutron beam receiver includes a fluorescent screen, an optical path black box, and a receiving camera. The fluorescent screen is installed at the input end of the optical path black box, and the receiving camera is installed at the output end of the optical path black box.

[0017] Preferably, the test dark box includes a darkroom cavity and a darkroom cover, the front side of the darkroom cavity is provided with a take-in and put-out port for taking the sample, the darkroom cover is hinged at the take-in and put-out port, the clamp entrance is arranged on the left and right sides of the darkroom cavity, the X-ray outlet and the X-ray entrance are respectively arranged on the top and bottom of the darkroom cavity, the neutron beam entrance is arranged on the darkroom cover, and the neutron beam outlet is arranged on the rear side of the darkroom cavity; the darkroom cavity and the darkroom cover are connected by a lock.

[0018] Preferably, the darkroom cavity and the darkroom cover are made of ceramics; the X-ray outlet, the X-ray inlet, the neutron beam inlet and the neutron beam outlet are all made of aluminum alloy interfaces.

[0019] Compared with the prior art, the present invention has achieved the following technical effects:

[0020] The in-situ testing device for material mechanical behavior under neutron and X-ray fusion imaging of the present invention: 1. It adopts X-ray phase contrast imaging, and the imaging sensitivity is higher than that of X-ray absorption contrast imaging, so the imaging quality can be guaranteed; 2. By adjusting the movable base, the spatial positions of modules such as the test cassette and the neutron imaging module can be moved, so that the neutron beam inlet of the test cassette finds the position of the neutron beam emitted by the neutron tracing emitter, and the neutron receiver can be matched to the same axis as the neutron tracing emitter, so that there is no need to integrate the neutron tracing emitter and the test device into an integrated device, which can solve the problem that the neutron imaging module and X-ray imaging are difficult to integrate into one system due to the neutron tracing emitter being a large device that cannot be moved; 3. The neutron tracing emitter and the seed beam receiver are arranged on the front and back sides of the test cassette, and the X-ray emitter and the X-ray receiver are arranged on the upper and lower sides of the test cassette. During the mechanical loading process, the loading arm can drive the sample to rotate 360°, so that the X-ray phase contrast imaging module and the neutron imaging module can be moved when the sample is in motion. A comprehensive scan of the sample is completed during the process of mechanical loading and thermal loading, which solves the problem that neutron and X-ray imaging cannot be synchronized with the loading process due to spatial conflicts; Fourth, the mechanical loading test module can be used to perform mechanical loading such as static stretching, compression, tension-torsion composite, and low-frequency fatigue loading on the sample, and the variable temperature loading module can be used to build a high-temperature / low-temperature variable temperature environment to perform thermal loading on the sample. The two are combined to simulate near-service loading tests, realizing the transition from traditional mechanical testing to near-service in-situ testing, and the measured test results are more real, reliable and comprehensive; through the fusion processing of X-ray phase contrast imaging data and neutron imaging data, a three-dimensional model of the sample under the corresponding loading state can be constructed, combined with the analysis of the mechanical load loading and ambient temperature loading of the sample loading data and the micro-macro structural evolution of the sample revealed by the reconstruction model, and then a high-sensitivity in-situ characterization of the sample in the macro-fine-micro structural evolution is obtained; Fifth, each module is integrated in a set of devices, which is more integrated and more convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a left front view stereoscopic structure schematic diagram of the in-situ testing device for mechanical behavior of materials under neutron and X-ray fusion imaging in the embodiment;

[0023] Figure 2It is a loading imaging principle diagram of an in-situ testing device for material mechanical behavior under neutron and X-ray fusion imaging in an embodiment;

[0024] Figure 3 is a structural schematic diagram of a positioning support module in an embodiment;

[0025] Figure 4 is a schematic structural diagram of a portal truss in an embodiment;

[0026] Figure 5 is a schematic structural diagram of a mobile base in an embodiment;

[0027] Figure 6 This is a schematic diagram of the structure of the bottom walking platform in the embodiment;

[0028] Figure 7 It is a structural schematic diagram of the horizontal lateral movement mechanism in the embodiment;

[0029] Figure 8 is a structural schematic diagram of a mechanical loading test module in an embodiment;

[0030] Fig. 9 It is a schematic diagram of the single-side structure of the mechanical loading test module in the embodiment;

[0031] Fig.10 It is a schematic diagram of a single-side structural explosion of a mechanical loading test module in an embodiment;

[0032] Fig.11 is a schematic diagram of the connection structure of the clamp and the pressure sensor in the embodiment;

[0033] Fig.12 is a schematic structural diagram of a clamp in an embodiment;

[0034] Fig.13 It is a schematic diagram of the right front view of the stereoscopic structure of the in-situ testing device for material mechanical behavior under neutron and X-ray fusion imaging in the embodiment;

[0035] Fig.14 is a schematic structural diagram of a test dark box in an embodiment;

[0036] Fig.15 Another perspective structural diagram of the test dark box in the embodiment;

[0037] Fig.16 It is a schematic diagram of the side-view stereoscopic structure of the in-situ testing device for material mechanical behavior under neutron and X-ray fusion imaging in the embodiment;

[0038] Fig.17 is a schematic structural diagram of a neutron beam receiver in an embodiment;

[0039] Fig.18Schematic diagram of the structure of the temperature measuring unit in the embodiment;

[0040] Fig.19 Schematic diagram of temperature control of variable temperature loading module in the embodiment;

[0041] Fig. 20 It is the specimen loading principle in the embodiment;

[0042] Fig.21 Implementing steps for the device in the embodiment;

[0043] Fig. 22 Schematic diagram of the neutron / X-ray phase contrast fusion imaging process in the embodiment (the image shown in the figure is only for distinguishing the difference between neutron imaging and X-ray phase contrast imaging results, and is not the actual result of neutron and X-ray phase contrast imaging);

[0044] Fig.23 It is a multi-source data fusion process implemented by the control module in the embodiment;

[0045] Fig.24 It is a method for realizing service condition simulation and mechanical behavior characterization in the embodiment.

[0046] Description of reference numerals:

[0047] 1. Positioning support module;

[0048] 10. Mobile base; 11. Test cassette; 12. Door-type truss; 13. Bottom walking platform; 14. Vertical mobile platform; 15. Longitudinal mobile platform; 16. Horizontal mobile platform;

[0049] 100, darkroom cavity; 101, darkroom cover; 102, fixture entrance; 103, X-ray exit; 104, X-ray entrance; 105, neutron beam entrance; 106, neutron beam exit; 107, test lead entrance; 108, nitrogen inlet; 109, nitrogen outlet; 110, lock; 111, lock lever; 112, handle; 113, hinge; 114, top frame; 115, center hole; 116, middle frame; 117, lower frame; 118, universal wheel; 119, foot; 120, high 121. Adjustment hand wheel; 122. Gear box; 123. Worm gear lift; 124. Rotating rod; 125. Transmission rod; 126. Coupling; 127. Longitudinal adjustment seat; 128. Longitudinal adjustment screw; 129. Longitudinal adjustment hand wheel; 130. Longitudinal linear guide; 131. Transverse adjustment seat; 132. Transverse adjustment screw; 133. Transverse adjustment hand wheel; 134. Transverse linear guide; 135. Screw nut; 136. Nut seat; 137. Screw bearing seat; 138. Support frame;

[0050] 2. Mechanical loading test module;

[0051] 20. Loading arm; 21. Clamp; 22. Pressure sensor; 23. Sample;

[0052] 200, loading base; 201, mechanical turntable; 202, loading rod; 203, support bearing seat; 204, support bearing; 205, bearing outer mounting plate; 206, bearing inner mounting plate; 207, electric telescopic cylinder; 208, electric cylinder fixing plate; 209, semicircular jacket; 210, locking nut; 211, arc-shaped limit plate; 212, power wire entrance; 213, sensor fixing piece; 214, sensor fixing shaft; 215, sensor nut; 216, adapter plate; 217, anti-dropping convex ring;

[0053] 2000, I-shaped steel plate; 2001, L-shaped steel plate; 2002, mounting bracket; 2003, triangular limit plate;

[0054] 3. Variable temperature loading module;

[0055] 30. Infrared thermometer; 31. Power-carrying wire;

[0056] 4. X-ray phase contrast imaging module;

[0057] 40. X-ray transmitter; 41. X-ray receiver; 42. Vertical linear slide; 43. Vertical slide block; 44. Receiver mounting plate; 45. Transmitter mounting platform;

[0058] 5. Neutron imaging module;

[0059] 50. Neutron beam receiver; 51. Horizontal linear slide; 52. Neutron mounting table; 501. Fluorescent screen; 502. Optical path black box; 503. Receiving camera. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] Example 1

[0062] This embodiment provides an in-situ testing device for material mechanical behavior under neutron and X-ray fusion imaging, such as Figures 1 to 24 As shown, it includes a positioning support module 1, a mechanical loading test module 2, a variable temperature loading module 3, an X-ray phase contrast imaging module 4 and a neutron imaging module 5.

[0063] The positioning support module 1 includes a test cassette 11, which can move in space, including in height and horizontal directions. A test area for testing a sample 23 is provided in the test cassette 11. Two clamp inlets 102 are provided on the left and right sides of the test cassette 11, and the clamp inlets 102 are provided for the clamp 21 to extend into. The connecting line of the clamp inlets 102 on the left and right sides of the test cassette 11 passes through the test area, and the sample 23 can be clamped at the test area by the extended clamp 21. X-ray outlets 103 and X-ray inlets 104 are provided on the top and bottom of the test cassette 11, and the connecting line of the X-ray outlet 103 and the X-ray inlet 104 passes through the test area, so that the injected X-rays can irradiate the sample 23 and pass through the sample 23. A neutron beam inlet 105 and a neutron beam outlet 106 are provided at the front and rear sides of the test dark box 11 , respectively. The line connecting the neutron beam inlet 105 and the neutron beam outlet 106 passes through the test area so that the incident neutron beam can pass through the irradiated sample 23 and penetrate the sample 23 .

[0064] The mechanical loading test module 2 includes two loading arms 20, and both loading arms 20 can rotate around their own axes. The two loading arms 20 are installed on the mobile base 10, and the two loading arms 20 correspond to the fixture entrance 102 on the left side and the fixture entrance 102 on the right side of the test cassette 11 respectively. The axes of the two loading arms 20 are both horizontally arranged, and the axes of the two loading arms 20 are coaxially arranged. There is a clamping spacing between the two loading arms 20, and the size of the clamping spacing can be adjusted. A clamp 21 is provided on the two loading arms 20, and the clamp 21 is located within the clamping spacing of the two loading arms 20. A pressure sensor 22 is provided between the loading arm 20 and the clamp 21. During the test, the clamps 21 of the two loading arms 20 need to clamp the two ends of the sample 23 respectively. By rotating the loading arms 20 and adjusting the clamping spacing, the sample 23 can be subjected to tension, compression, torsion or low-frequency fatigue loading.

[0065] The variable temperature loading module 3 is used to control and monitor the temperature of the sample 23 , and realize variable temperature loading and recording of the sample 23 .

[0066] The X-ray phase contrast imaging module 4 includes an X-ray transmitter 40 and an X-ray receiver 41, which are mounted on the mobile base 10. The X-ray transmitter 40 is located below the test cassette 11, that is, it can be extended into the X-ray inlet 104, and is used to transmit X-rays to the X-ray inlet 104. The X-ray receiver 41 is located above the test cassette 11, that is, above the X-ray outlet 103, and is used to receive the X-rays emitted by the X-ray outlet 103 to form X-ray phase contrast imaging.

[0067] The neutron imaging module 5 includes a neutron beam receiver 50 , which is mounted on the mobile base 10 and located behind the test cassette 11 , and is used to receive the neutron beam emitted from the neutron beam outlet 106 to form neutron imaging.

[0068] Working principle:

[0069] First, the test device is moved as a whole to the emission end of the neutron tracing emitter through the mobile base 10; then, the spatial position of the test dark box 11 is adjusted by the mobile base 10, so that the neutron beam inlet 105 of the test dark box 11 is aligned with the emission end of the neutron tracing emitter; then, the sample 23 is clamped on the clamp 21 of the two loading arms 20, so that the sample 23 is located in the test area of ​​the test dark box 11, and the mechanical loading test module 2, the variable temperature loading module 3, the X-ray phase contrast imaging module 4, the neutron imaging module 5 and the neutron tracing emitter are started, and the neutron beam and X-ray are irradiated on the sample 23, and the variable temperature loading module 3 changes the temperature of the sample 23 according to the preset temperature; then, the clamping distance between the two loading arms 20 is increased (to achieve tensile loading) or decreased (to test compression loading), and at the same time, the loading arm 20 starts to rotate, and the neutron beam and X-ray are 360° on the sample The sample 23 is scanned, and the sample 23 starts to rotate continuously by 0 to 360 degrees under the clamp 21, so that the sample 23 is imaged continuously by 0 to 360 degrees. At the same time, the deformation value of the sample 23, the value of the pressure sensor 22, the neutron imaging data, and the X-ray phase contrast imaging data are recorded. By fusion processing of the X-ray phase contrast imaging data and the neutron imaging data, a three-dimensional model of the sample 23 under the corresponding loading state can be constructed. By combining the analysis of all the loading data of the sample 23 (mechanical load loading, ambient temperature loading) with the micro-macrostructural evolution of the sample 23 revealed by the reconstructed model, the purpose of macro-fine-micro multi-scale characterization of the mechanical behavior of the sample 23 is achieved, and a highly sensitive in-situ characterization of the macro-fine-microstructural evolution of the sample 23 under near-service conditions (mechanical load loading, ambient temperature loading) is obtained.

[0070] In one embodiment, if Figures 1 to 24 As shown, the X-ray emitter 40, the X-ray receiver 41, the X-ray emitter 40, the X-ray inlet 104, and the X-ray outlet 103 are coaxially arranged. The neutron beam receiver 50, the neutron beam inlet 105, and the neutron beam outlet 106 are coaxially arranged.

[0071] In one embodiment, if Figures 1 to 24 As shown, the positioning support module 1 further includes a portal truss 12. The X-ray receiver 41 is mounted on the top of the portal truss 12, and the neutron beam receiver 50 is mounted on the mobile base 10. The test cassette 11 is mounted on the mobile base 10 through the support frame 138, and the test cassette 11 is moved in space through the mobile base 10.

[0072] In one embodiment, if Figures 1 to 24 As shown, the portal truss 12 includes a top frame 114, two middle frames 116 and two lower frames 117. The lower frames 117 and the middle frames 116 form a group from bottom to top and serve as two side walls of the portal truss 12 respectively. The two ends of the top frame 114 are installed on the two middle frames 116. The middle of the top frame 114 is provided with a center hole 115 for installing the X-ray receiver 41

[0073] In one embodiment, if Figures 1 to 24 As shown, the mobile base 10 includes a bottom walking platform 13, a vertical moving platform 14, a longitudinal moving platform 15 and a transverse moving platform 16. The bottom walking platform 13 is placed on the ground through a universal wheel 118 with a foot 119. The universal wheel 118 has two modes, one is that the foot 119 contacts the ground to achieve the function of keeping the bottom walking platform 13 immobile, and the other is that the universal wheel 118 releases the ground to achieve the walking function of the bottom walking platform 13. The vertical moving platform 14 is installed on the bottom walking platform 13 through a height adjustment mechanism, and the height of the vertical moving platform 14 can be adjusted by the height adjustment mechanism, and the height direction is set as the Z-axis direction. The longitudinal moving platform 15 is installed on the vertical moving platform 14 through a horizontal longitudinal moving mechanism, and the horizontal longitudinal moving mechanism can realize the longitudinal moving platform 15 to move in the horizontal longitudinal direction, and the horizontal longitudinal direction is parallel to the change direction of the clamping spacing size, and the horizontal longitudinal direction is set as the Y-axis direction. The transverse moving platform 16 is installed on the longitudinal moving platform 15 through a horizontal transverse moving mechanism. The horizontal transverse moving mechanism can realize the horizontal transverse movement of the transverse moving platform 16. The horizontal transverse movement is perpendicular to the clamping spacing size and changes direction. The horizontal transverse movement direction is set as the X-axis direction. The portal truss 12, the support frame 138, the loading arm 20, and the neutron beam receiver 50 are all arranged on the transverse moving platform 16. The spatial position of the test dark box 11 can be adjusted by the bottom walking platform 13, the vertical moving platform 14, the longitudinal moving platform 15 and the transverse moving platform 16, thereby ensuring that the neutron beam can be injected from the neutron beam inlet 105 of the test dark box 11 to hit the sample 23, and is injected from the neutron beam outlet 106 and received by the neutron beam receiver 50.

[0074] In one embodiment, if Figures 1 to 24As shown, the height adjustment mechanism includes a height adjustment hand wheel 120, an adjustment bearing seat 121, three gear boxes 122, four worm gear elevators 123, a rotating rod 124 and four transmission rods 125. The four worm gear elevators 123 are arranged in a rectangular shape on the bottom walking platform 13, two of the four worm gear elevators 123 are a group, and two gear boxes 122 are respectively arranged between two of the two groups of worm gear elevators 123, and the output ports of the gear boxes 122 located in the two worm gear elevators 123 are connected to the two worm gear elevators 123 through a transmission rod 125. Then the input ports of the two gear boxes 122 are connected to the two output ports of the third gear box 122. The adjustment bearing seat 121 is installed on the bottom walking platform 13, and the adjustment bearing seat 121 is located between the height adjustment hand wheel 120 and the third gear box 122. A rotating rod 124 is rotatably connected to the adjusting bearing seat 121, and the height adjustment hand wheel 120 is connected to the input port of the third gear box 122 through the rotating rod 124. In addition, the height adjustment mechanism can also adopt other lifting methods such as a jack, a scissor lift platform, etc.

[0075] In one embodiment, if Figures 1 to 24 As shown, one end of the rotating rod 124 is fixedly connected to the height adjustment hand wheel 120, and the other end of the rotating rod 124 is connected to the input port of the gear box 122 through the coupling 126. The transmission rod 125 is connected to the output port of the gear box 122 and the worm gear elevator 123 through the coupling 126.

[0076] In one embodiment, if Figures 1 to 24As shown, the horizontal longitudinal moving mechanism includes a longitudinal adjustment seat 127, a longitudinal adjustment screw 128, a longitudinal adjustment hand wheel 129 and two longitudinal linear guides 130. The two longitudinal linear guides 130 are installed on the vertical moving platform 14, and the two longitudinal linear guides 130 are arranged horizontally and longitudinally (i.e. arranged along the Y-axis direction). The longitudinal moving platform 15 is slidably connected to the two longitudinal linear guides 130 through a guide slider. The longitudinal adjustment seat 127 is fixedly connected to the vertical moving platform 14, and the fixed connection mentioned here is such as welding, bolts, riveting, etc. The longitudinal adjustment seat 127 is located between the two longitudinal linear guides 130. The longitudinal adjustment screw 128 is threadedly connected to the longitudinal adjustment seat 127, and the longitudinal adjustment screw 128 is arranged horizontally and longitudinally (i.e. arranged along the Y-axis direction), the longitudinal adjustment hand wheel 129 is fixedly connected to the longitudinal adjustment screw 128, and the longitudinal adjustment screw 128 is rotatably connected to the longitudinal moving platform 15. By rotating the longitudinal adjustment hand wheel 129, the longitudinal adjustment screw 128 can be driven to rotate, and under the threaded cooperation between the longitudinal adjustment screw 128 and the longitudinal adjustment seat 127, the longitudinal adjustment screw 128 is converted to move along the axial direction, thereby driving the longitudinal moving platform 15 to move horizontally and longitudinally, that is, move along the Y-axis direction. In addition, the horizontal longitudinal moving mechanism can also use a telescopic cylinder to replace the movement mode of the longitudinal adjustment screw 128.

[0077] In one embodiment, if Figures 1 to 24 As shown, a screw bearing seat 137 and a nut seat 136 are provided at the bottom of the longitudinal moving platform 15, and a screw nut 135 is installed on the nut seat 136. One end of the longitudinal adjustment screw 128 is threadedly connected to the longitudinal adjustment seat 127, and the other end is threadedly connected to the screw nut 135 and passes through the nut seat 136. The part passing through the nut seat 136 is rotatably connected to the screw bearing seat 137.

[0078] In one embodiment, if Figures 1 to 24As shown, the horizontal longitudinal moving mechanism includes a transverse adjustment seat 131, a transverse adjustment screw 132, a transverse adjustment hand wheel 133 and two transverse linear guides 134. The two transverse linear guides 134 are installed on the longitudinal moving platform 15, and the two transverse linear guides 134 are horizontally arranged (i.e. arranged along the X-axis direction). The transverse moving platform 16 is slidably connected to the two transverse linear guides 134 through a guide slider. The transverse adjustment seat 131 is fixedly connected to the longitudinal moving platform 15, and the fixed connection mentioned here is such as welding, bolts, riveting, etc. The transverse adjustment seat 131 is located between the two transverse linear guides 134. The transverse adjustment screw 132 is threadedly connected to the transverse adjustment seat 131, and the transverse adjustment screw 132 is horizontally arranged (i.e. arranged along the X-axis direction), the transverse adjustment hand wheel 133 is fixedly connected to the transverse adjustment screw 132, and the transverse adjustment screw 132 is rotationally connected to the transverse moving platform 16. The lateral adjustment hand wheel 133 can drive the lateral adjustment screw 132 to rotate, and under the threaded cooperation between the lateral adjustment screw 132 and the lateral adjustment seat 131, the lateral adjustment screw 132 is converted to move along the axial direction, thereby driving the longitudinal moving platform 15 to move horizontally, that is, move along the X-axis direction. In addition, the horizontal lateral movement mechanism can also use a telescopic cylinder to replace the movement mode of the lateral adjustment screw 132.

[0079] In one embodiment, if Figures 1 to 24 As shown, a screw bearing seat 137 and a nut seat 136 are provided at the bottom of the transverse moving platform 16, and a screw nut 135 is installed on the nut seat 136. One end of the transverse adjustment screw 132 is threadedly connected to the longitudinal adjustment seat 127, and the other end is threadedly connected to the screw nut 135 and passes through the nut seat 136, and the part passing through the nut seat 136 is rotatably connected to the screw bearing seat 137.

[0080] In one embodiment, if Figures 1 to 24As shown, the loading arm 20 includes a loading base 200, a mechanical turntable 201, a loading rod 202, a support bearing seat 203 and an electric telescopic cylinder 207. The electric telescopic cylinder 207 has a built-in grating. The loading base 200 is mounted on the mobile base 10, and if there is a transverse moving platform 16, it is mounted on the transverse moving platform 16. A number of loading rods 202 are arranged around the outer periphery of the cylinder body of the electric telescopic cylinder 207, one end of the loading rod 202 is connected to the output end of the mechanical turntable 201 through an adapter plate 216, and the other end of the loading rod 202 is fixedly connected to the inner ring of the support bearing 204 in the support bearing seat 203. The support bearing seat 203 is mounted on the mobile base 10, and if there is a transverse moving platform 16, it is mounted on the transverse moving platform 16. The cylinder body of the electric telescopic cylinder 207 is fixedly connected to the inner ring of the support bearing 204, and the piston rod of the electric telescopic cylinder 207 is connected to the clamp 21 through a pressure sensor 22. Multiple support bearing seats 203 can be provided to improve the stability of the electric telescopic cylinder 207. For example, two support bearing seats 203 are provided, one support bearing seat 203 supports the middle part of the electric telescopic cylinder 207, and the other support bearing seat 203 supports one end of the electric telescopic cylinder 207 close to the piston rod. The mechanical turntable 201 is started, and the electric telescopic cylinder 207 is driven to rotate under the rotation of the output end of the mechanical turntable 201, thereby driving the clamp 21 to rotate and realize the rotation of the sample 23. The extension and retraction of the electric telescopic cylinder 207 can change the clamping distance between the two loading arms 20, so that the clamp 21 pulls or compresses the sample 23. The electric telescopic cylinders 207 on the two loading arms 20 are symmetrically arranged relative to the sample 23. During the test, the electric telescopic cylinders 207 on the two loading arms 20 can act independently to perform tension, compression, torsion or low-frequency fatigue loading on one end of the sample 23, or can act synchronously to perform static and dynamic tension / compression or low-frequency fatigue loading on both ends of the sample 23 to ensure that the center of the sample 23 does not shift during the loading process. The deformation of the sample 23 can be measured by the built-in grating of the electric telescopic cylinder 207, and the force data of the sample 23 can be obtained by the pressure sensor 22. In combination with the temperature load applied to the sample 23 by the variable temperature loading module 3, all the load data of the sample 23 can be obtained.

[0081] In one embodiment, if Figures 1 to 24 As shown, the adapter plate 216 is installed on the output port of the mechanical turntable 201 by screws. One end of the loading rod 202 is connected to the adapter plate 216 by bolts, and the other end of the loading rod 202 is processed with threads. The inner ring of the support bearing 204 is fixed with a bearing inner mounting plate 206, and the bearing inner mounting plate 206 is connected to the bearing outer mounting plate 205 by bolts. The bearing outer mounting plate 205 is provided with a threaded hole, which is threadedly connected to the threaded end of the loading rod 202 through the threaded hole. The cylinder body of the electric telescopic cylinder 207 is fixedly connected to the bearing outer mounting plate 205 through the electric cylinder fixing plate 208.

[0082] In one embodiment, if Figures 1 to 24 As shown, the loading base 200 includes an I-shaped steel plate 2000, an L-shaped steel plate 2001 and a mounting bracket 2002. The lower flange of the I-shaped steel plate 2000 is mounted on the movable base 10, and if there is a transverse movable platform 16, it is mounted on the transverse movable platform 16. The transverse plate section of the L-shaped steel plate 2001 is mounted on the upper flange of the I-shaped steel plate 2000. The mechanical turntable 201 is mounted on the transverse plate section of the L-shaped steel plate 2001, and the mechanical turntable 201 abuts against the vertical plate section of the L-shaped steel plate 2001 to limit the mechanical turntable 201. The mounting bracket 2002 is mounted on the transverse plate section of the L-shaped steel plate 2001, and the supporting bearing seat 203 is mounted on the mounting bracket 2002. The above-mentioned installation methods include welding, bolt connection, riveting, etc.

[0083] In one embodiment, if Figures 1 to 24 As shown, the test dark box 11 is fixedly connected to the horizontal plate section of the L-shaped steel plate 2001 of the two loading arms 20 through the support frame 138.

[0084] In one embodiment, if Figures 1 to 24 As shown, the L-shaped steel plate 2001 is also provided with triangular limiting plates 2003 located on both sides of the mechanical turntable 201 to limit the X-axis direction of the mechanical turntable 201.

[0085] In one embodiment, if Figures 1 to 24 As shown, the pressure sensor 22 is fixed to the piston rod of the electric telescopic cylinder 207 via a sensor fixing member 213 , and the pressure sensor 22 is connected to the fixture 21 via a sensor fixing shaft 214 .

[0086] In one embodiment, if Figures 1 to 24 As shown, the pressure sensor 22 is connected to the sensor fixing member 213 through the sensor nut 215. The sensor fixing shaft 214 is processed with internal threads, and the sensing shaft of the pressure sensor 22 is processed with external threads. The sensor fixing shaft 214 and the sensing shaft of the pressure sensor 22 are connected through internal and external threads.

[0087] In one embodiment, if Figures 1 to 24As shown, the fixture 21 includes two semicircular jackets 209, and the two semicircular jackets 209 are combined to form a complete fixture 21. The semicircular jacket 209 includes a first clamping end and a second clamping end, and the first clamping end is used to be sleeved on the sensor fixed shaft 214, and a locking thread is provided on the outer wall of the first clamping end. The inner wall of the second clamping end is provided with an arc-shaped limit plate 211, and a sleeve opening is provided between the arc-shaped limit plates 211 of the two combined semicircular jackets 209. Anti-slip convex rings 217 are provided at both ends of the sample 23, and the diameter of the anti-slip convex ring 217 is larger than the sleeve opening. When in use, first put the first clamping ends of the two semicircular sleeves 209 on the sensor fixed shaft 214, and the second clamping ends of the two semicircular sleeves 209 on the sample 23, and then screw the locking nut 210 into the locking thread of the first clamping end, and the two semicircular sleeves 209 clamp the sensor fixed shaft 214 and the sample 23. With the cooperation of the anti-slip convex ring 217 and the sleeve opening of the arc-shaped limit plate 211, the sample 23 will not fall off the fixture 21.

[0088] In one embodiment, if Figures 1 to 24 As shown, the variable temperature loading module 3 is installed on the mobile base 10. The variable temperature loading module 3 includes a refrigeration unit, a heating unit and a temperature measuring unit, and the refrigeration unit includes a nitrogen gas source. A nitrogen inlet 108 and a nitrogen outlet 109 are provided on the test dark box 11, and the nitrogen inlet 108 is connected to the nitrogen gas source. A low-temperature gas atmosphere can be constructed inside the test dark box 11 to achieve low-temperature loading of the sample 23. The number of nitrogen inlets 108 and nitrogen outlets 109 is not limited and can be one each, or multiple ones can be set. The heating unit includes a power-carrying wire 31, and the power-carrying wire 31 is connected to a power source. The clamp 21 is an insulating clamp, and a power-carrying wire inlet 212 is provided on the insulating clamp. The power-carrying wire 31 extends into the insulating clamp through the power-carrying wire inlet 212. The insulating clamp crimps the power-carrying wire 31 with the sample 23, and then electrically heats the sample 23 to achieve high-temperature loading. If the fixture 21 is in the form of two semicircular jackets 209, the current wire inlet 212 is arbitrarily set on one of the two semicircular jackets 209. After the sample 23 is installed, the two semicircular jackets 209 are buckled together to ensure that the current wire 31 is pressed and fit tightly with the sample 23. The temperature measuring unit is installed in the test dark box 11 to monitor the temperature of the sample 23 in real time.

[0089] In one embodiment, if Figures 1 to 24 As shown, the temperature measuring unit includes an infrared thermometer 30, which is installed in the test dark box 11. The test dark box 11 is provided with a test wire inlet 107, and the infrared thermometer 30 is electrically connected to the external test wire through the test wire inlet 107. One or more infrared thermometers 30 can be provided, such as two infrared thermometers 30, which are fixed to the top wall of the test dark box 11 by screws, and the temperature measuring points of the two infrared thermometers 30 intersect at the theoretical center point of the sample 23.

[0090] In one embodiment, if Figures 1 to 24 As shown, the X-ray phase contrast imaging module 4 also includes a vertical linear slide 42, a vertical sliding block 43, a receiver mounting plate 44 and a transmitter mounting platform 45. The vertical linear slide 42 is vertically mounted on the top of the portal truss 12, and if there is a center hole 115, the vertical linear slide 42 is mounted at the center hole 115. The vertical sliding block 43 is slidably connected to the vertical linear slide 42, and the receiver mounting plate 44 is mounted on the vertical sliding block 43. The X-ray receiver 41 is mounted on the receiver mounting plate 44. The transmitter mounting platform 45 is mounted on the mobile base 10. If the mobile base 10 has a horizontal moving platform 16, the transmitter mounting platform 45 is mounted on the horizontal moving platform 16. The X-ray receiver 41 and the X-ray transmitter 40 are coaxially arranged, and the corresponding X-ray outlet 103 and the X-ray inlet 104 are coaxially arranged. The X-ray transmitter 40 can extend into the X-ray inlet 104. The above installation includes welding, bolting, riveting, etc. Due to the principle of X-ray phase contrast imaging, in order to meet the high-resolution imaging requirements of the sample 23, the vertical position of the X-ray receiver 41 is adjusted by sliding the vertical sliding block 43 up and down (moving along the Z-axis direction), thereby meeting the spacing requirements of the X-ray receiver 41 and the X-ray transmitter 40. After the X-rays emitted by the X-ray transmitter 40 pass through the sample 23, they pass through the X-ray outlet 103 and are received by the X-ray receiver 41, completing the X-ray scanning of the sample 23 and realizing X-ray phase contrast imaging.

[0091] In one embodiment, if Figures 1 to 24 As shown, the neutron imaging module 5 also includes a transverse linear slide 51, a transverse sliding block, and a neutron mounting platform 52. The neutron mounting platform 52 is mounted on the mobile base 10. If the mobile base 10 has a transverse moving platform 16, the neutron mounting platform 52 is mounted on the transverse moving platform 16. The transverse linear slide 51 is mounted on the neutron mounting platform 52, the transverse sliding block is slidably connected to the transverse linear slide 51, and the neutron beam receiver 50 is mounted on the transverse sliding block. The above-mentioned installation includes welding, bolt connection, riveting, etc. The position of the neutron beam receiver 50 is adjusted by the transverse sliding block so that the neutron beam receiver 50 extends into the neutron beam outlet 106 of the test cassette 11 and is as close to the sample 23 as possible to meet the requirements for imaging resolution. After the neutron beam emitted by the neutron tracing transmitter hits the sample 23 through the neutron beam inlet 105, it is received by the neutron beam receiver 50, and a CT tomography scan is completed on the sample 23 to achieve neutron imaging.

[0092] In one embodiment, if Figures 1 to 24As shown, the neutron beam receiver 50 includes a fluorescent screen 501, an optical black box 502, and a receiving camera 503. The fluorescent screen 501 is installed at the input end of the optical black box 502, and the receiving camera 503 is installed at the output end of the optical black box 502. After the neutron beam hits the sample 23, it will first be received by the fluorescent screen 501 and converted into visible light, and then pass through the optical black box 502 and finally be received by the receiving camera 503 to complete CT tomography and realize neutron imaging.

[0093] In one embodiment, if Figures 1 to 24 As shown, the test dark box 11 includes a dark chamber cavity 100 and a dark chamber cover 101. A take-in and take-out port for taking and putting the sample 23 is provided on the front side of the dark chamber cavity 100, and the dark chamber cover 101 is hinged at the take-in and take-out port. A fixture entrance 102 is provided on the left and right sides of the dark chamber cavity 100. The X-ray outlet 103 and the X-ray inlet 104 are respectively provided at the top and the bottom of the dark chamber cavity 100, and the X-ray outlet 103 and the X-ray inlet 104 are coaxially arranged. The neutron beam inlet 105 is arranged on the dark chamber cover 101, and the neutron beam outlet 106 is arranged on the rear side of the dark chamber cavity 100.

[0094] In one embodiment, if Figures 1 to 24 As shown, the darkroom cavity 100 and the darkroom cover 101 are hingedly connected by a hinge 113 .

[0095] In one embodiment, if Figures 1 to 24 As shown, two nitrogen inlets 108 are provided on the right side of the darkroom cavity 100 , and a nitrogen inlet 108 and a nitrogen outlet 109 are provided on the left side of the darkroom cavity 100 .

[0096] In one embodiment, if Figures 1 to 24 As shown, the darkroom cavity 100 and the darkroom cover 101 are made of ceramics to prevent electromagnetic interference and ensure smooth electric heating.

[0097] In one embodiment, if Figures 1 to 24 As shown, a handle 112 is installed on the darkroom cover 101 for an operator to open and close the darkroom cavity 100 and the darkroom cover 101 .

[0098] In one embodiment, if Figures 1 to 24 As shown, the darkroom cavity 100 and the darkroom cover 101 are connected by a lock. The lock includes a lock buckle 110 and a lock buckle pull rod 111. The lock buckle 110 is installed on the right or left side of the darkroom cavity 100. The lock buckle pull rod 111 is installed on the darkroom cover 101. The lock buckle pull rod 111 and the lock buckle 110 cooperate to achieve locking and unlocking. The above installation includes welding, bolt connection and riveting, etc.

[0099] In one embodiment, if Figures 1 to 24As shown, the X-ray outlet 103, the X-ray inlet 104, the neutron beam inlet 105 and the neutron beam outlet 106 all adopt aluminum alloy interfaces to reduce interference with X-rays and neutrons.

[0100] In one embodiment, if Figures 1 to 24 As shown, the test wire inlet 107, the nitrogen inlet 108, and the nitrogen outlet 109 are all threaded on one side and are connected to the darkroom cavity 100 by threads. The X-ray outlet 103 and the X-ray outlet 104 are connected to the darkroom cavity 100 by bolts. The fixture inlet 102 is rigidly connected to the darkroom cavity 100 by screws, and the fixture inlet 102 and the darkroom cavity 100 are sealed. The neutron beam inlet 105 is installed on the darkroom cavity 100 by screws, and the neutron beam outlet 106 is installed on the darkroom cavity 100 by bolts.

[0101] Example 2

[0102] This embodiment provides an in-situ testing method for mechanical behavior of materials under neutron and X-ray fusion imaging. The in-situ testing device for mechanical behavior of materials under neutron and X-ray fusion imaging in Embodiment 1 is used to perform the test. Figures 1 to 24 As shown, the following steps are included:

[0103] Step 1: Installing the sample: Clamp the two ends of the sample 23 with the clamps 21 of the two loading arms 20 respectively;

[0104] Step 2, each module is turned on and the spatial coordinate system is calibrated: the mechanical loading test module 2, the variable temperature loading module 3, the X-ray phase contrast imaging module 4 and the neutron imaging module 5 are turned on. The mechanical loading test module 2 and the variable temperature loading module 3 constitute a local coordinate system, and the X-ray phase contrast imaging module 4 and the neutron imaging module 5 constitute a global coordinate system of the test device. First, the local coordinate system and the global coordinate system are unified in the coordinate origin, and then the sample 23 is subjected to loading test and characterization;

[0105] Step 3: Variable temperature loading of the sample: The temperature control of the sample 23 is controlled and monitored by the variable temperature loading module 3;

[0106] Step 4: Mechanical loading of the sample: The two loading arms 20 are used to synchronously perform tensile loading or compression loading on both ends of the sample 23. At the same time, the two loading arms 20 rotate synchronously and in the same direction, driving the sample 23 to perform a 360° step rotation to serve the next step of imaging;

[0107] Step 5: In-situ monitoring of the sample: The in-situ monitoring of the sample 23 is realized by the X-ray phase contrast imaging module 4 and the neutron imaging module 5. After the X-rays emitted by the X-ray emitter 40 pass through the sample 23, they are received by the X-ray receiver 41, and the X-ray scanning of the sample 23 is completed to realize X-ray phase contrast imaging; after the neutron beam passes through the neutron beam inlet 105 and hits the sample 23, it is received by the neutron beam receiver 50, and the CT tomography scanning of the sample 23 is completed to realize neutron imaging;

[0108] Step 6: Fusion of X-ray characterization image and neutron characterization image: Since the X-ray receiver 41 and the neutron beam receiver 50 have different spatial positions, the X-ray and neutron imaging positions of the sample 23 at the same time are different. Therefore, the processed image obtained by the X-ray receiver 41 and the processed image obtained by the neutron beam receiver 50 are first time-sequentially aligned, that is, the images representing the same position of the sample 23 under the same loading state are aligned one by one, and then fused to obtain an image that takes into account the characteristics of both X-ray phase contrast imaging and neutron imaging. Finally, the aligned image is reconstructed to obtain a three-dimensional model of the sample 23 under the corresponding loading state, completing the neutron and X-ray fusion imaging process.

[0109] In one embodiment, if Figures 1 to 24 As shown, the relevant formulas for mechanical loading test, thermal loading test, and neutron and X-ray fusion imaging are as follows:

[0110] 1. Under tensile conditions

[0111] Stress σ calculation formula:

[0112]

[0113] Where F1 is the tensile force and A is the cross-sectional area of ​​the specimen;

[0114] Strain ε calculation formula:

[0115]

[0116] Δl is the elongation of the specimen, and l is the original length of the specimen.

[0117] 2. Under compression conditions

[0118] Stress σ calculation formula:

[0119]

[0120] Where F2 is the compression force and A is the cross-sectional area of ​​the specimen;

[0121] Strain ε calculation formula:

[0122]

[0123] Δl is the elongation of the specimen, and l is the original length of the specimen.

[0124] 3. Under torsion conditions

[0125] For circular cross-section material samples;

[0126] Maximum shear stress τ max Calculation formula:

[0127]

[0128] Where M is the torque, W is p is the torsional section coefficient;

[0129] The calculation formula of torsion angle φ is:

[0130]

[0131] Where G is the shear modulus, I p is the polar moment of inertia of the cross section;

[0132]

[0133] Where D is the diameter of the sample;

[0134] For rectangular cross-section material samples:

[0135] Maximum shear stress τ max Calculation formula:

[0136]

[0137] Where M is the torque, h is the long side of the rectangular cross section, b is the short side of the rectangular cross section, and a is the coefficient related to h / b;

[0138] The calculation formula of torsion angle φ is:

[0139]

[0140] Where G is the shear modulus, I t is the torsional stiffness of the material sample;

[0141] I t =βhb2 (11)

[0142] β is the coefficient related to h / b;

[0143] Under tensile or compression-torsion combined loads, the surface of the material sample is a dangerous point. The equivalent stress calculation formula of the dangerous point is:

[0144]

[0145] Where F1 is the axial tensile force, A is the cross-sectional area of ​​the material sample, M is the torque, and Wp is the torsional section coefficient;

[0146] 4. Under high (low) temperature variable temperature loading conditions

[0147] The calculation formula of the temperature of the metal sample after electrical heating is:

[0148]

[0149] In the formula, T0 is the initial temperature, U is the power-on voltage, t is the heating time, m is the sample mass, c is the sample specific heat capacity, and R is the sample resistance;

[0150] Take a microelement of the material sample with a length of dx for analysis, and the heat of convection heat transfer is:

[0151]

[0152] Where, h is the heat transfer coefficient of the convective heat transfer surface, tf is the ambient temperature, C is the circumference of the material sample section, and A is the cross-sectional area of ​​the material sample;

[0153] 5. Calculation formula for objective fusion quality coefficient of neutron and X-ray fusion imaging:

[0154]

[0155] Where QAF and QBF are the edge preservation values ​​of the neutron characterization image and the X-ray characterization image, and wA and wB are weight values.

[0156] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An in-situ testing device for material mechanical behavior under neutron and X-ray fusion imaging, characterized in that: include: A positioning support module, wherein the positioning support module comprises a mobile base capable of moving in space, a test cassette is arranged on the mobile base, a test cassette is arranged in the test cassette for testing a test area, a fixture entrance is arranged on the left and right sides of the test cassette, a line connecting the fixture entrances on the left and right sides of the test cassette passes through the test area, an X-ray outlet and an X-ray entrance are arranged on the top and bottom of the test cassette, a line connecting the X-ray outlet and the X-ray entrance passes through the test area, a neutron beam entrance and a neutron beam exit are arranged on the front and rear sides of the test cassette, a line connecting the neutron beam entrance and the neutron beam exit passes through the test area; A mechanical loading test module, the mechanical loading test module comprising two loading arms that can rotate around their own axes, the two loading arms being mounted on the mobile base, and the two loading arms corresponding to the fixture entrances on the left and right sides of the test dark box respectively, the axes of the two loading arms being coaxial and arranged horizontally, an adjustable clamping distance being provided between the two loading arms, a clamp being provided on the loading arm and being located within the clamping distance, a pressure sensor being provided between the loading arm and the clamp, and the clamps of the two loading arms being used to clamp the two ends of the sample respectively; A variable temperature loading module, used for controlling and monitoring the temperature of the sample, wherein the variable temperature loading module is arranged on the mobile base; An X-ray phase contrast imaging module, comprising an X-ray transmitter and an X-ray receiver, wherein the X-ray transmitter and the X-ray receiver are mounted on the mobile base, and are respectively located below and above the test cassette, wherein the X-ray transmitter is used to transmit X-rays to the X-ray inlet, and the X-ray receiver is used to receive X-rays emitted by the X-ray outlet; The neutron imaging module comprises a neutron beam receiver, which is mounted on the movable base and located behind the test cassette and is used to receive the neutron beam emitted from the neutron beam outlet.

2. The in-situ testing device for material mechanical behavior under neutron and X-ray fusion imaging according to claim 1, characterized in that: The positioning support module also includes a portal truss, the X-ray receiver is installed on the top of the portal truss, and the test dark box is installed on the mobile base through a support frame; the mobile base includes a bottom walking platform, a vertical moving platform, a longitudinal moving platform and a transverse moving platform, the bottom walking platform is placed on the ground through universal wheels with feet, the vertical moving platform is installed on the bottom walking platform through a height adjustment mechanism, the longitudinal moving platform is installed on the vertical moving platform through a horizontal longitudinal moving mechanism, the horizontal longitudinal direction is parallel to the clamping spacing size change direction, the transverse moving platform is installed on the longitudinal moving platform through a horizontal transverse moving mechanism, the horizontal transverse direction is perpendicular to the clamping spacing size change direction, and the portal truss, the support frame, and the loading arm are all arranged on the transverse moving platform.

3. The in-situ testing device for material mechanical behavior under neutron and X-ray fusion imaging according to claim 2, characterized in that: The height adjustment mechanism includes a height adjustment handwheel, an adjustment bearing seat, three gear boxes and four worm gear lifts. The four worm gear lifts are arranged in a rectangular shape on the bottom walking platform. The adjustment bearing seat is installed on the bottom walking platform. A rotating rod is rotatably connected to the adjustment bearing seat. The height adjustment handwheel is connected to the input port of one of the gear boxes through the rotating rod. Two of the four worm gear lifts form a group with each other, and the output ports of the other two gear boxes connect two of the worm gear lifts in a group through transmission rods. The two output ports of the gear box connected to the rotating rod are respectively connected to the input ports of the other two gear boxes through transmission shafts; the horizontal longitudinal movement mechanism includes a longitudinal adjustment seat, a longitudinal adjustment screw, a longitudinal adjustment handwheel and two horizontal A longitudinal linear guide rail is arranged longitudinally, the longitudinal adjustment seat is fixedly connected to the vertical movable platform, the longitudinal adjustment screw is threadedly connected to the longitudinal adjustment seat, the longitudinal adjustment screw is arranged horizontally and longitudinally, the longitudinal adjustment handwheel is fixedly connected to the longitudinal adjustment screw, and the longitudinal adjustment screw is rotatably connected to the longitudinal movable platform; the horizontal longitudinal movable mechanism includes a transverse adjustment seat, a transverse adjustment screw, a transverse adjustment handwheel and two transverse linear guide rails arranged horizontally and transversely, the transverse adjustment seat is fixedly connected to the longitudinal movable platform, the transverse adjustment screw is threadedly connected to the transverse adjustment seat, the transverse adjustment screw is arranged horizontally and transversely, the transverse adjustment handwheel is fixedly connected to the transverse adjustment screw, and the transverse adjustment screw is rotatably connected to the transverse movable platform.

4. The in-situ testing device for material mechanical behavior under neutron and X-ray fusion imaging according to claim 2, characterized in that: The loading arm comprises a loading base, a mechanical turntable, a loading rod, a supporting bearing seat and an electric telescopic cylinder with a built-in grating, the loading base is mounted on the mobile base, the loading rod is arranged around the periphery of the cylinder body of the electric telescopic cylinder, one end of the loading rod is connected to the output end of the mechanical turntable through an adapter plate, the other end of the loading rod is fixedly connected to the inner ring of the supporting bearing in the supporting bearing seat, the supporting bearing seat is mounted on the mobile base, the cylinder body of the electric telescopic cylinder is fixedly connected to the inner ring of the supporting bearing, and the piston rod of the electric telescopic cylinder is connected to the clamp through the pressure sensor; The supporting base includes an I-shaped steel plate, an L-shaped steel plate and a mounting bracket, the lower flange of the I-shaped steel plate is mounted on the movable base, the transverse plate section of the L-shaped steel plate is mounted on the upper flange of the I-shaped steel plate, the mechanical turntable is mounted on the transverse plate section of the L-shaped steel plate, the mechanical turntable abuts against the vertical plate section of the L-shaped steel plate, the mounting bracket is mounted on the transverse plate section of the L-shaped steel plate, and the supporting bearing seat is mounted on the transverse plate section of the L-shaped steel plate; the pressure sensor is fixed to the piston rod of the electric telescopic cylinder through a sensor fixing member, and the pressure sensor is connected to the clamp through a sensor fixing shaft.

5. The in-situ testing device for material mechanical behavior under neutron and X-ray fusion imaging according to claim 4, characterized in that: The clamp includes two semicircular sleeves that can be combined, and the semicircular sleeves include a first clamping end and a second clamping end. The first clamping end is used to be sleeved on the sensor fixing shaft, and the outer wall of the first clamping end is provided with a locking thread for threaded connection of a locking nut, and the inner wall of the second clamping end is provided with an arc-shaped limiting plate. A sleeve opening that can be sleeved on the sample is provided between the arc-shaped limiting plates of the two combined semicircular sleeves, and an anti-slip convex ring with a diameter larger than the sleeve opening is provided on the end of the sample.

6. The in-situ testing device for material mechanical behavior under neutron and X-ray fusion imaging according to claim 1, characterized in that: The variable temperature loading module is installed on the mobile base, and the variable temperature loading module includes a refrigeration unit, a heating unit and a temperature measuring unit. The refrigeration unit includes a nitrogen gas source. The test dark box is provided with a nitrogen inlet and a nitrogen outlet, and the nitrogen inlet is connected to the nitrogen gas source. The heating unit includes a power-carrying wire connected to a power supply. The clamp is an insulating clamp, and the insulating clamp is provided with a power-carrying wire inlet. The power-carrying wire extends into the insulating clamp through the power-carrying wire inlet. The insulating clamp crimps the power-carrying wire and the sample. The temperature measuring unit is installed in the test dark box; the temperature measuring unit includes an infrared thermometer installed in the test dark box. The test dark box is provided with a test wire inlet, and the infrared thermometer is electrically connected to the external test wire through the test wire inlet.

7. The in-situ testing device for material mechanical behavior under neutron and X-ray fusion imaging according to claim 2, characterized in that: The X-ray phase contrast imaging module also includes a vertical linear slide, a vertical sliding block, a receiver mounting plate, and a transmitter mounting platform. The vertical linear slide is vertically installed on the top of the portal truss, the vertical sliding block is slidably connected to the vertical linear slide, the X-ray receiver is installed on the vertical linear slide through the receiver mounting plate, the transmitter mounting platform is installed on the mobile base, and the X-ray transmitter is installed on the transmitter mounting platform.

8. The in-situ testing device for material mechanical behavior under neutron and X-ray fusion imaging according to claim 1, characterized in that: The neutron imaging module also includes a transverse linear slide, a transverse sliding block, and a neutron mounting table. The neutron mounting table is installed on the movable base, the transverse linear slide is installed on the neutron mounting table, the transverse sliding block is slidably connected to the transverse linear slide, and the neutron beam receiver is installed on the transverse sliding block; the neutron beam receiver includes a fluorescent screen, an optical path black box, and a receiving camera. The fluorescent screen is installed at the input end of the optical path black box, and the receiving camera is installed at the output end of the optical path black box.

9. The in-situ testing device for material mechanical behavior under neutron and X-ray fusion imaging according to claim 8, characterized in that: The test dark box includes a darkroom cavity and a darkroom cover, the front side of the darkroom cavity is provided with a take-in and put-out port for taking the sample, the darkroom cover is hinged at the take-in and put-out port, the clamp entrance is arranged on the left and right sides of the darkroom cavity, the X-ray outlet and the X-ray entrance are respectively arranged on the top and bottom of the darkroom cavity, the neutron beam entrance is arranged on the darkroom cover, and the neutron beam outlet is arranged on the rear side of the darkroom cavity; the darkroom cavity and the darkroom cover are connected by a lock.

10. The in-situ testing device for material mechanical behavior under neutron and X-ray fusion imaging according to claim 9, characterized in that: The darkroom cavity and the darkroom cover are made of ceramics; the X-ray outlet, the X-ray inlet, the neutron beam inlet and the neutron beam outlet are all made of aluminum alloy interfaces.

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