A multi-functional micro-CT apparatus

Abstract

The present application belongs to the technical field of precision nondestructive testing, and relates to a multifunctional micro-CT device which can simultaneously realize in-situ compression, stretching and torsion loading of a test piece, and comprises a one-way adjustable X-ray emitting mechanism, a multifunctional in-situ loading device, a double-shaft adjustable detector and a bed body. The multifunctional loading device is located between the one-way adjustable X-ray emitting mechanism and the double-shaft adjustable detector, and the one-way adjustable X-ray emitting mechanism, the double-shaft adjustable detector and the multifunctional in-situ loading device are installed on the bed body. On the basis of ensuring a larger bearing capacity and sufficient moving space of the test piece, high spatial resolution imaging of 3 microns is realized, and the bearing performance, moving flexibility and imaging precision are taken into account, so that the device can be widely adapted to nondestructive testing requirements in many fields such as additive manufacturing, mechanical processing and material science.

Description

Technical Field

[0001] This invention belongs to the field of precision non-destructive testing technology and relates to a multifunctional micro-CT device that can simultaneously perform in-situ compression, tension and torsional loading on specimens. Background Technology

[0002] In the fields of materials science and engineering, micro-CT, as a non-destructive three-dimensional imaging technique, has become an important tool for observing internal structural damage in materials. Combined with in-situ loading devices, it can monitor and analyze the dynamic evolution of material damage. However, most current in-situ micro-CT loading devices have relatively limited functionality, with the vast majority only capable of performing simple in-situ compression loading. For example, CN111965027A discloses a micro-CT in-situ tensile testing device, including a sealed experimental chamber, upper and lower tensile rods, a control system, and an adjustment system. The sealed experimental chamber has a chamber door for sample loading and unloading, and a ring of transparent windows in the middle section of the sealed experimental chamber allowing X-rays to pass through. The upper and lower tensile rods pass through the top and bottom of the experimental chamber, respectively, and are dynamically sealed to the sealed experimental chamber. The control system includes a pressure control system and a temperature control system. The pressure control system controls the atmosphere in the sealed experimental chamber, and the temperature control system controls the temperature of the sample in the sealed experimental chamber, including a heating lamp and a temperature sensor. The system is used to adjust the spatial position of the sample, and includes a control platform and a hexagonal platform, which are dynamically sealed to the bottom of the sealed experimental chamber via an adapter plate. CN121164332A discloses a bidirectional in-situ compression device and its operation method for matching X-ray imaging detection. The bidirectional in-situ compression device includes a lower support platform, a lower weight plate slidably sleeved on the right side of the lower support platform, a lower detection platform fixed on the top of the lower support platform, and a lower detection pressure block slidably installed inside the lower detection platform; and an upper support cylinder detachably installed on the top of the lower detection platform. However, in actual engineering, materials will also be subjected to tensile and torsional loads, and existing technologies are difficult to achieve the above working conditions, making it impossible to comprehensively evaluate the mechanical properties of the material. Therefore, there is an urgent need for a multifunctional micro-CT device that can realize in-situ compression, tensile, and torsional loading. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and to design a multifunctional micro-CT device that enables high-resolution tomographic scanning and three-dimensional reconstruction of specimens under in-situ compression, tension and torsion loading.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A multifunctional micro-CT device includes a unidirectional adjustable X-ray emission mechanism, a multifunctional in-situ loading device, a dual-axis adjustable detector, and a bed. The multifunctional loading device is located between the unidirectional adjustable X-ray emission mechanism and the dual-axis adjustable detector. The unidirectional adjustable X-ray emission mechanism, the dual-axis adjustable detector, and the multifunctional in-situ loading device are mounted on the bed.

[0005] As a further technical solution of the present invention, the unidirectional adjustable X-ray emission mechanism 1 includes a radiation source bracket, a radiation source vertical motion guide rail, a radiation source connecting plate, a laser collimator A, an X-ray source, a motor A, and a lead screw A; the radiation source vertical motion guide rail is vertically fixed to the radiation source bracket via the lead screw A, the radiation source bracket is vertically fixed to the bed by bolts, the radiation source vertical motion guide rail is vertically arranged inside the radiation source bracket, the radiation source connecting plate is connected to the radiation source vertical motion guide rail via a sliding pair, the X-ray source is arranged on the vertical surface of the radiation source connecting plate and is fixed to the radiation source connecting plate by bolts; the laser collimator A is arranged directly above the X-ray source to achieve centering calibration of the object to be measured in the X direction; the lead screw A is arranged centrally inside the radiation source bracket and vertically along the Z-axis, the lead screw A passes through the radiation source connecting plate and the motor A, and the motor A is arranged at the upper end of the lead screw A.

[0006] As a further technical solution of the present invention, the multifunctional in-situ loading device includes a compression loading device, a tensile loading device, a torsional loading device, a drag chain A, a motor B, and a lead screw B; the compression loading device is located between the middle crossbeam and the lower crossbeam, and includes a loading vertical column A, a loading vertical column B, a middle crossbeam, a lower crossbeam, an upper rotating device A, a pressure plate, a platform, and the lower rotating device A; the lower rotating device A is bolted to the upper surface of the lower crossbeam; the platform is bolted to the lower rotating device A; the upper rotating device A is bolted to the lower surface of the middle crossbeam; the pressure plate is bolted to the upper rotating device A; the tensile-torsional loading device is located between the upper crossbeam and the middle crossbeam, and the tensile-torsional loading device... The loading device includes a loading vertical column A, a loading vertical column B, an upper crossbeam, a middle crossbeam, an upper rotating device B, an upper clamp, a lower clamp, and a lower rotating device B. The lower rotating device B is bolted to the upper surface of the middle crossbeam; the lower clamp is bolted to the lower rotating device B; the upper rotating device B is bolted to the lower surface of the upper crossbeam; and the upper clamp is bolted to the upper rotating device B. Laser collimators B are installed inside the loading vertical columns B between the middle and lower crossbeams, and between the upper and middle crossbeams, to achieve centering and calibration of the object under test in the Y direction. Cable chains A are installed on the outer sides of both loading vertical columns A and B, extending along the Y-axis. One end is fixedly connected to the cable lead-out ends of the loading vertical columns A and B, and the other end extends and is fixed to the bed. The layout path of the drag chain A is adapted to the movement trajectory of the loading vertical columns A and B. Lead screws B are centrally arranged inside the loading vertical columns A and B. Lead screws B are arranged vertically along the Z-axis and pass through the upper crossbeam, middle crossbeam, lower crossbeam, and motor B. Motor B is located at the upper end of lead screw B, and the upper and middle crossbeams move up and down along the Z-axis by driving the lead screw B to rotate. Motors C are installed inside the upper rotating device A, upper rotating device B, lower rotating device A, and lower rotating device B, and rotation in the XY plane is achieved by driving the rotation through motor C. The pressure plate can extend and retract along the Z-axis. A compressive load is applied to the object to be tested on the stage. The upper and lower clamps move along the crossbeam guide rail to extend and retract, thus applying a tensile load to the specimen. The upper clamp, driven by a motor and in conjunction with the upper rotating device B, rotates in the XY plane to apply a torsional load to the specimen. The upper and lower clamps, driven by the motor, can perform a clamping function to stabilize the specimen. The loading vertical column A and loading vertical column B are vertically mounted on the column guide rail, forming a sliding pair connection. Driven by a motor, the loading vertical column A and loading vertical column B move along the Y direction. The column guide rail is horizontally mounted on the bed by bolts. A laser collimator B is installed inside the loading vertical column B to center and calibrate the position of the object to be tested in the Y direction.

[0007] As a further technical solution of the present invention, the dual-axis adjustable detector is used to receive the remaining rays after the rays emitted by the X-ray source penetrate the object under test, for subsequent CT image processing. Specifically, it includes a detector base, a detector support frame, an X-axis motion guide rail, a Y-axis motion guide rail, a Z-axis motion guide rail, a detector connecting plate, a detector, and a drag chain B. The detector and the Z-axis motion guide rail form a sliding joint connection, and the detector is driven to move along the Z-axis motion guide rail by an internal motor. The Y-axis motion guide rail is bolted to the detector support frame. The detector support frame 2 is placed along the Z-axis direction. The detector support frame and the Y-axis motion guide rail form a sliding joint connection, and the detector support frame is driven to move along the Y-axis by a motor. The Y-axis motion guide rail is bolted to the detector base. The detector base and the X-axis motion guide rail form a sliding joint connection, and the detector base is driven to move along the X-axis by a motor. The axis motion guide rail is connected to the detector base by bolts. The drag chain B is set on the outer wall of the detector support frame and extends along the Z-axis direction. One end of the drag chain B is fixedly connected to the cable lead-out end of the detector connection plate, and the other end extends and is fixed to the detector base. The layout path of the drag chain B is adapted to the motion trajectory of the detector.

[0008] This invention enables high-resolution tomographic scanning and three-dimensional reconstruction of specimens under in-situ compression, tension, and torsion loading. While ensuring the placement, loading, and spatial movement of the basic specimen, it achieves micron-level imaging accuracy and is applicable to non-destructive testing needs in many fields such as additive manufacturing, machining, and materials science.

[0009] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention effectively integrates three in-situ loading modes: compression, tension and torsion. Through the reasonable layout of the multifunctional in-situ loading device, the tension-torsion loading device and the compression loading device are set up in layers. With the coordinated action of each rotating device and fixture, the specimen can be simultaneously loaded in-situ under multiple working conditions and scanned with tomography on a single device.

[0010] (2) The present invention uses two laser collimators in the X and Y directions to correct the position of the specimen and prevent the specimen from deviating from the X-ray source.

[0011] (3) This invention adopts a "coreless linear motor direct drive" as the driving scheme for translational motion, which completely eliminates the backlash and frictional nonlinearity in traditional lead screw transmission, and realizes direct, fast and smooth linear motion. At the same time, the system integrates an "absolute magnetostrictive displacement measurement system" for full closed-loop position feedback. The non-contact working mode of this sensor gives it extremely high resolution and radiation resistance, and it can work stably in X-ray environment for a long time, ensuring that the positioning accuracy of each axis can reach the submicron level.

[0012] (4) This invention achieves high spatial resolution imaging of 3 micrometers while ensuring the large load-bearing capacity and sufficient moving space of the specimen. It takes into account the load-bearing performance, moving flexibility and imaging accuracy, and can be widely adapted to the non-destructive testing needs of many fields such as additive manufacturing, machining and materials science. Attached Figure Description

[0013] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention.

[0014] Figure 2 This is a three-dimensional schematic diagram of the unidirectional adjustable X-ray emission mechanism of the present invention.

[0015] Figure 3 This is a three-dimensional schematic diagram of the multifunctional in-situ loading device of the present invention.

[0016] Figure 4 This is a schematic diagram of the internal structure of the upper rotating device B described in this invention.

[0017] Figure 5 This is a three-dimensional schematic diagram of the dual-axis adjustable detector of the present invention.

[0018] The components include: 1. A unidirectional adjustable X-ray emission mechanism; 101. A radiation source support; 102. A vertical motion guide rail for the radiation source; 103. A radiation source connecting plate; 104. A laser collimator A; 105. An X-ray source; 106. A motor A; 107. A lead screw A; 2. A multifunctional in-situ loading device; 201. A loading vertical column A; 202. A loading vertical column B; 203. An upper crossbeam; 204. A middle crossbeam; 205. A lower crossbeam; 206. An upper rotating device B; 207. An upper clamp. 208. Lower clamp; 209. Lower rotating device B; 210. Upper rotating device A; 211. Pressure plate; 212. Platform; 213. Lower rotating device A; 214. Cable chain A; 215. Column guide rail; 216. Crossbeam guide rail; 217. Laser collimator B; 218. Motor B; 219. Lead screw B; 220. Motor C; 3. Dual-axis adjustable detector; 301. Detector base; 302. Detector support frame; 303. X-axis motion guide rail; 304. Z-axis motion guide rail; 305. Detector connecting plate; 306. Detector; 307. Y-axis motion guide rail; 308. Cable chain B; 4. Bed. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example

[0020] like Figure 1As shown, this embodiment provides a multifunctional micro-CT device, including a unidirectional adjustable X-ray emission mechanism 1, a multifunctional in-situ loading device 2, a dual-axis adjustable detector 3, and a bed 4. The multifunctional loading device 2 is located between the unidirectional adjustable X-ray emission mechanism 1 and the dual-axis adjustable detector 3. The unidirectional adjustable X-ray emission mechanism 1, the dual-axis adjustable detector 3, and the multifunctional in-situ loading device 2 are mounted on the bed 4.

[0021] like Figure 2 As shown, the unidirectional adjustable X-ray emission mechanism 1 includes a radiation source bracket 101, a radiation source vertical motion guide rail 102, a radiation source connecting plate 103, a laser collimator A104, an X-ray source 105, a motor A106, and a lead screw A107. The radiation source vertical motion guide rail 102 is vertically fixed to the radiation source bracket 101 via the lead screw A107. The radiation source bracket 101 is vertically fixed to the bed 4 via bolts. The radiation source vertical motion guide rail 102 is vertically arranged inside the radiation source bracket 101. The radiation source connecting plate 103 is connected to the radiation source vertical motion guide rail 102 via a sliding joint. The X-ray source 105... The X-ray source 105 is mounted on the vertical surface of the X-ray source connecting plate 103 and fixed to the X-ray source connecting plate 103 with bolts. A laser collimator A104 is set directly above the X-ray source 105 to achieve centering and calibration of the object under test in the X-direction. A lead screw A107 is set in the center inside the X-ray source bracket 101 and arranged vertically along the Z-axis. The lead screw A107 passes through the X-ray source connecting plate 103 and the motor A106. The motor A106 is set at the upper end of the lead screw A107. The motor A106 drives the lead screw A107 to rotate, thereby moving the X-ray source 105 up and down along the Z-axis to adapt to different loading states and specimens of different sizes.

[0022] like Figure 3As shown, the multifunctional in-situ loading device 2 includes a compression loading device, a tensile loading device, a torsional loading device, a drag chain A214, a motor B218, and a lead screw B219. The compression loading device is located between the middle crossbeam 204 and the lower crossbeam 205. The compression loading device includes a loading vertical column A201, a loading vertical column B202, a middle crossbeam 204, a lower crossbeam 205, an upper rotating device A210, a pressure plate 211, a platform 212, and a lower rotating device A213. The lower rotating device A213 is bolted to the upper surface of the lower crossbeam 205; the platform 212 is bolted to the lower rotating device A213; and the upper rotating device A210 is bolted to the lower surface of the middle crossbeam 204. The bearing plate 211 is bolted to the upper rotating device A210; the tension-torsion loading device is located between the upper crossbeam 203 and the middle crossbeam 204, and includes a loading vertical column A201, a loading vertical column B202, an upper crossbeam 203, a middle crossbeam 204, an upper rotating device B206, an upper clamp 207, a lower clamp 208, and a lower rotating device B209. The lower rotating device B209 is bolted to the upper surface of the middle crossbeam 204; the lower clamp 208 is bolted to the lower rotating device B209; the upper rotating device B206 is bolted to the lower surface of the upper crossbeam 203; the upper clamp 207 is bolted to the upper crossbeam 204; the upper clamp 208 ... The rotating device B206 is connected by bolts; laser collimators B217 are installed inside the loading vertical columns B202 between the middle crossbeam 204 and the lower crossbeam 205, and between the upper crossbeam 203 and the middle crossbeam 204, to achieve centering calibration of the object under test in the Y direction; drag chains A214 are installed on the outside of the loading vertical columns A201 and B202, extending along the Y-axis; one end of the drag chain A214 is fixedly connected to the cable lead-out end of the loading vertical columns A201 and B202, and the other end extends and is fixed to the bed 4. The layout path of the drag chain A214 is the same as that of the loading vertical columns A201 and B202. The motion trajectory of 202 is adapted to each other; a lead screw B219 is arranged in the center of the inner side of the loading vertical column A201 and the loading vertical column B202. The lead screw B219 is arranged vertically along the Z-axis and passes through the upper crossbeam 203, the middle crossbeam 204, the lower crossbeam 205 and the motor B218. The motor B218 is set at the upper end of the lead screw B219. The upper crossbeam 203 and the middle crossbeam 204 move up and down along the Z-axis by driving the lead screw B219 to rotate through the motor B218; a motor C220 is set in the upper rotating device A211, the upper rotating device B206, the lower rotating device A213 and the lower rotating device B209. The rotation in the XY plane is achieved by driving the motor C220.The pressure plate 211 can extend and retract along the Z-axis to apply a compressive load to the object to be tested on the stage 212. The upper clamp 207 and the lower clamp 208 move along the crossbeam guide rail to extend and retract the clamps, thereby applying a tensile load to the specimen. The upper clamp 207 can also rotate in the XY plane through a motor drive in conjunction with the upper rotating device B, thereby applying a torsional load to the specimen. The upper clamp 207 and the lower clamp 208 can perform a clamping function under motor drive to stabilize the specimen. The loading vertical column A201 and the loading vertical column B202 are vertically mounted on the column guide rail 215 to form a sliding pair connection. The loading vertical column A201 and the loading vertical column B202 can move along the Y direction through a motor drive. The column guide rail 215 is horizontally mounted on the bed 4 by bolts. The loading vertical column B202 is not equipped with a laser collimator B217 inside to achieve centering and calibration of the object to be tested in the Y direction. ;

[0023] When conducting an in-situ compression loading test, the test object is placed on the stage 212. Different loads are applied to the specimen by adjusting the extension and retraction of the pressure plate 211. The load remains constant during loading. The upper rotating device A210 and the lower rotating device A213 rotate synchronously to perform dynamic micro-CT scanning of the test object under different loads. When conducting an in-situ tensile loading test, the test object is placed between the upper clamp 207 and the lower clamp 208. The tightness of the upper clamp 207 and the lower clamp 208 is adjusted to place and fix the test object. A tensile load is applied to the test object by moving the middle crossbeam 204 downwards. The load remains constant during tensile loading. The upper rotating device B206 and the lower rotating device B209 rotate synchronously to perform micro-CT scanning of the test object under different loads. Dynamic scanning; When performing in-situ torsional loading tests, the test specimen is placed between the upper clamp 207 and the lower clamp 208; the tightness of the upper clamp 207 and the lower clamp 208 is adjusted to place and fix the specimen. The torsional load is applied to the specimen by rotating the upper rotating device B206. The load can be kept constant at any time during the torsional loading process. By making the upper rotating device B206 and the lower rotating device B209 rotate synchronously, the micro-CT dynamic scanning of the test specimen under different loads is completed.

[0024] As shown in Figure 4, the dual-axis adjustable detector 3 is used to receive the residual rays after the X-rays emitted by the X-ray source 105 penetrate the object under test, for subsequent CT image processing. The dual-axis adjustability is designed to accommodate specimens of different sizes. Specifically, it includes a detector base 301, a detector support frame 302, an X-axis motion guide rail 303, a Y-axis motion guide rail 307, a Z-axis motion guide rail 304, a detector connecting plate 305, a detector 306, and a drag chain B308. The detector 306 and the Z-axis motion guide rail 304 are connected by a sliding joint, and the detector 306 is driven to move along the Z-axis motion guide rail 304 by an internal motor. The Y-axis motion guide rail 307 is bolted to the detector support frame 302. The detector support frame 302 is placed along the Z-axis direction. The detector support frame 302 and the Y-axis motion guide rail 307 are connected by a sliding joint, and the detector support frame 302 is driven to move along the Y-axis by a motor. The detector base 301 is bolted to the detector base 301; the detector base 301 and the X-axis motion guide rail 303 form a sliding pair connection, and the detector base 301 is driven by a motor to move along the X-axis; the X-axis motion guide rail 303 and the detector base 301 are bolted to each other; the drag chain B308 is set on the outer wall of the detector support frame 302 and extends along the Z-axis direction; one end of the drag chain B308 is fixedly connected to the cable lead-out end of the detector connecting plate 305, and the other end extends and is fixed to the detector base 301; the layout path of the drag chain B308 is adapted to the movement trajectory of the detector 306; the drag chain B308 is used to accommodate and constrain the cable connecting the detector 306 and the detector base 301; through the structured storage of the hinged chain links, the cable is prevented from being pulled, twisted, tangled or worn during the translation of the detector 306, ensuring the physical integrity of the cable and the reliability of the electrical connection.

[0025] This embodiment provides a multifunctional micro-CT device capable of in-situ compression, tension, and torsional loading. Each motion guide rail can achieve high-precision translation, and the rotating device of the multifunctional in-situ loading device 2 has high-precision rotation capability around the axis, significantly improving the imaging flexibility and spatial adaptability of the device for complex sample detection, ensuring that the detector always maintains the optimal imaging pose, thereby effectively improving the quality of CT three-dimensional imaging and the accuracy of data acquisition. The compression, torsional, and tension load application devices are all controlled by electro-hydraulic servo to ensure the accuracy and stability of load application.

[0026] In this embodiment, the bed frame is made of natural marble, which has a dense material, low coefficient of thermal expansion, and good shape and position stability, effectively suppressing deformation caused by changes in ambient temperature and external vibrations. The bed frame surface is covered with a 5mm carbon fiber epoxy composite surface layer. This material has high strength, wear resistance, and corrosion resistance, which can effectively protect the marble substrate surface and avoid damage from bumps during the testing process. The overall structure takes into account the support stability, surface protection, and durability, ensuring the long-term high-precision operation of the equipment.

[0027] In this embodiment, a laser collimator A104 extending in the Z direction is placed directly above the X-ray source 105 to achieve centering calibration of the object under test in the X direction; a laser collimator extending in the Z direction is placed inside the vertical column B to achieve centering calibration of the object under test in the Y direction. A two-dimensional positioning reference is formed by relying on the laser light path extending in the Z direction, which effectively improves the placement and positioning accuracy of the object under test, avoids imaging distortion and data deviation caused by positional deviation, and ensures the image quality and data accuracy of micro-CT detection.

[0028] The stage 212 described in this embodiment has a maximum diameter of 20cm and a maximum load capacity of 25kg. This specification design can be adapted to test specimens of different sizes and weights. The circular stage has no restrictions on the placement of corners, making it more adaptable. The 25kg load capacity can meet the testing requirements of conventional test specimens.

[0029] The unidirectional adjustable X-ray emission mechanism 1 and the dual-axis adjustable detector 3 described in this embodiment constitute a CT system with a maximum imaging spatial resolution of 3 micrometers.

[0030] In this embodiment, all motors are coreless linear motors. Each of the upper rotating device B206, lower rotating device B209, upper rotating device A210, and lower rotating device A213 is equipped with an absolute magnetostrictive displacement measurement system. This system achieves fully closed-loop position detection. It relies on the magnetostrictive strain effect generated by the magnetostrictive material under the combined action of an external magnetic field and a pulsed magnetic field. The permanent magnet on the moving component moves synchronously with the moving components of the unidirectional adjustable X-ray emission mechanism, the multifunctional in-situ loading device, and the dual-axis adjustable detector. The detection unit periodically emits current pulses to form an axial magnetic field transmitted along the magnetostrictive waveguide rod. When this magnetic field meets the magnetic field of the permanent magnet, it generates a magnetostrictive strain pulse. The strain pulse travels back along the waveguide rod at a fixed sound speed and is converted into an electrical signal. By accurately measuring the time difference between pulse emission and reception, the absolute position coordinates of the moving component are directly calculated. Simultaneously, the position signal is fed back to the control system in real time to dynamically correct motion deviations, ensuring that the positioning accuracy of each moving component consistently reaches the micrometer level.

[0031] In this embodiment, each mechanical movement unit is controlled by a control system. The control system adopts conventional existing technology and uses an absolute magnetostrictive displacement measurement system for position measurement to achieve high-precision positioning and resistance to radiation effects. The X-axis, Y-axis, and Z-axis translational motion is achieved through direct drive of a coreless linear motor in conjunction with precision ball bearing guides. Each mechanical movement unit is uniformly controlled by the control system, and position detection is completed with the absolute magnetostrictive displacement measurement system. This achieves high-precision positioning of each movement axis and has good radiation resistance, making it suitable for the radiation working environment of X-ray detection. The X, Y, and Z-axis translational motion adopts a structure of direct drive of a coreless linear motor in conjunction with precision ball bearing guides, which effectively eliminates transmission backlash, improves motion smoothness and positioning accuracy, reduces mechanical wear, and enhances operational stability. Overall, it provides stable and reliable mechanical motion support for high-precision imaging of the equipment, ensuring positioning accuracy and equipment durability in complex detection scenarios.

[0032] In this embodiment, the test specimen is first clamped in a multifunctional in-situ loading device and positioned by laser collimation. A corresponding mechanical load is applied according to the testing conditions. A unidirectional adjustable X-ray emission mechanism emits stable X-rays that penetrate the specimen. After attenuation by different tissues and structures within the specimen, the X-rays carry internal morphological information. A dual-axis adjustable detector synchronously receives multi-view projection signals. An absolute magnetostrictive displacement measurement system monitors and corrects the relative poses of the X-ray source, loading device, and detector throughout the process. The control system collects all projection data and processes it using a three-dimensional reconstruction algorithm to ultimately reconstruct a high-resolution tomographic image and a three-dimensional solid model of the internal structure of the test specimen, achieving in-situ non-destructive imaging and structural characterization under multiple mechanical conditions.

[0033] Components, systems, and principles not described in detail herein are general techniques in the field.

Claims

1. A multifunctional micro-CT device, characterized in that, It includes a unidirectional adjustable X-ray emission mechanism, a multi-functional in-situ loading device, a dual-axis adjustable detector, and a bed. The multi-functional loading device is located between the unidirectional adjustable X-ray emission mechanism and the dual-axis adjustable detector. The unidirectional adjustable X-ray emission mechanism, the dual-axis adjustable detector, and the multi-functional in-situ loading device are mounted on the bed.

2. The multifunctional micro-CT device according to claim 1, characterized in that, The unidirectional adjustable X-ray emission mechanism 1 includes a radiation source bracket, a radiation source vertical motion guide rail, a radiation source connecting plate, a laser collimator A, an X-ray source, a motor A, and a lead screw A. The radiation source vertical motion guide rail is vertically fixed to the radiation source bracket via the lead screw A. The radiation source bracket is vertically fixed to the bed by bolts. The radiation source vertical motion guide rail is vertically arranged inside the radiation source bracket. The radiation source connecting plate is connected to the radiation source vertical motion guide rail via a sliding pair. The X-ray source is located on the vertical surface of the radiation source connecting plate and is fixed to the radiation source connecting plate by bolts. The laser collimator A is arranged directly above the X-ray source to achieve centering and calibration of the object under test in the X direction. The lead screw A is arranged centrally inside the radiation source bracket and vertically along the Z-axis. The lead screw A passes through the radiation source connecting plate and the motor A, and the motor A is located at the upper end of the lead screw A.

3. The multifunctional micro-CT device according to claim 2, characterized in that, The multifunctional in-situ loading device includes a compression loading device, a tensile loading device, a torsional loading device, a drag chain A, a motor B, and a lead screw B. The compression loading device is located between the middle crossbeam and the lower crossbeam, and includes a loading vertical column A, a loading vertical column B, a middle crossbeam, a lower crossbeam, an upper rotating device A, a pressure plate, a platform, and the lower rotating device A. The lower rotating device A is bolted to the upper surface of the lower crossbeam; the platform is bolted to the lower rotating device A; the upper rotating device A is bolted to the lower surface of the middle crossbeam; and the pressure plate is bolted to the upper rotating device A. The tensile-torsional loading device is located between the upper crossbeam and the middle crossbeam, and includes a loading vertical column A, a loading vertical column B, a middle crossbeam, a lower crossbeam, an upper rotating device A, a pressure plate, a platform, and the lower rotating device A. The loading vertical column A, loading vertical column B, upper crossbeam, middle crossbeam, upper rotating device B, upper clamp, lower clamp, and lower rotating device B are connected. The lower rotating device B is bolted to the upper surface of the middle crossbeam; the lower clamp is bolted to the lower rotating device B; the upper rotating device B is bolted to the lower surface of the upper crossbeam; and the upper clamp is bolted to the upper rotating device B. Laser collimators B are installed inside the loading vertical column B between the middle and lower crossbeams, and between the upper and middle crossbeams, to center and calibrate the position of the object under test in the Y direction. Cable chains A are installed on the outside of both loading vertical columns A and B, extending along the Y-axis. One end of the cable chain A is connected to the loading vertical column B. The cable leads of column A and loading vertical column B are fixedly connected, with the other end extending and fixed to the bed. The routing path of drag chain A is adapted to the movement trajectory of loading vertical columns A and B. Lead screws B are centrally located on the inner sides of both loading vertical columns A and B. Lead screws B are arranged vertically along the Z-axis and pass through the upper crossbeam, middle crossbeam, lower crossbeam, and motor B. Motor B is located at the upper end of lead screw B, driving the rotation of lead screw B to move the upper and middle crossbeams up and down along the Z-axis. Motors C are installed inside the upper rotating device A, upper rotating device B, lower rotating device A, and lower rotating device B, driving rotation in the XY plane. The pressure plate can extend and retract along the Z-axis to support the load. A compressive load is applied to the object to be tested on the platform. The upper and lower clamps move along the crossbeam guide rail to extend and retract the clamps, thus applying a tensile load to the specimen. The upper clamp, driven by a motor and in conjunction with the upper rotating device B, rotates in the XY plane to apply a torsional load to the specimen. The upper and lower clamps, driven by the motor, can perform a clamping function to stabilize the specimen. The loading vertical column A and loading vertical column B are vertically mounted on the column guide rail, forming a sliding pair connection. Driven by a motor, the loading vertical column A and loading vertical column B move along the Y direction. The column guide rail is horizontally mounted on the bed by bolts. A laser collimator B is installed inside the loading vertical column B to center and calibrate the position of the object to be tested in the Y direction.

4. The multifunctional micro-CT device according to claim 3, characterized in that, The dual-axis adjustable detector is used to receive the residual rays after X-rays from the X-ray source penetrate the object under test, for subsequent CT image processing. Specifically, it includes a detector base, a detector support frame, an X-axis motion guide rail, a Y-axis motion guide rail, a Z-axis motion guide rail, a detector connecting plate, a detector, and a drag chain B. The detector and the Z-axis motion guide rail are connected by a sliding joint, and the detector moves along the Z-axis motion guide rail via an internal motor. The Y-axis motion guide rail is bolted to the detector support frame. The detector support frame 2 is placed along the Z-axis direction. The detector support frame and the Y-axis motion guide rail are connected by a sliding joint, and the detector support frame moves along the Y-axis via a motor. The Y-axis motion guide rail is bolted to the detector base. The detector base and the X-axis motion guide rail are connected by a sliding joint, and the detector base moves along the X-axis via a motor. The axis motion guide rail is connected to the detector base by bolts. The drag chain B is set on the outer wall of the detector support frame and extends along the Z-axis direction. One end of the drag chain B is fixedly connected to the cable lead-out end of the detector connection plate, and the other end extends and is fixed to the detector base. The layout path of the drag chain B is adapted to the motion trajectory of the detector.

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