Fiber optic eddy current nondestructive testing device and testing method for coupled indentation testing

Abstract

The present invention discloses a fiber optic eddy current nondestructive testing device and a testing method for coupled indentation testing, and relates to the technical field of nondestructive testing. It comprises: a base plate, a support frame fixedly connected to the base plate, a crossbeam of the support frame and the base plate spaced apart, a fiber optic eddy current nondestructive testing module fixed on the crossbeam, a residual stress indentation detection module fixed on the crossbeam, a fiber optic eddy current / indentation detection function switching module fixed on the base plate, an adaptive fixture module fixed on the end of the fiber optic eddy current / indentation detection function switching module away from the base plate, and the fiber optic eddy current nondestructive testing module, the residual stress indentation detection module, the fiber optic eddy current / indentation detection function switching module and the adaptive fixture module are all electrically connected to a control module. The fiber optic eddy current nondestructive testing device for coupled indentation testing provided by the present invention can realize synchronous co-location testing of multiple parameters such as geometric morphology, damage defects and residual stress of processed surface or sub-surface carbon fiber composite materials.

Description

Technical Field

[0001] The invention relates to the technical field of nondestructive testing, and more particularly to an optical fiber eddy current nondestructive testing device and a testing method for coupled indentation testing. Background Art

[0002] In recent years, various advanced composite materials represented by carbon fiber have been widely used in many industrial fields such as aerospace vehicles, automobiles and wind power generation. The development of aerospace, national defense and automobile manufacturing is an important guarantee for national strategy and social livelihood. Advanced composite materials are one of the bottlenecks to break through the development of the above-mentioned fields and are also one of the current research hotspots at home and abroad.

[0003] However, composite materials, like ordinary materials, also have various damage defects during production and actual operation due to various reasons, such as geometric defects, cracks, residual stress, etc. Timely defect detection of composite materials is a key step to ensure their safe, reliable and high-performance application. For the evaluation of surface or sub-surface defects and damage of composite materials, non-destructive testing technology developed in the past century is undoubtedly the first ideal means to consider. Non-destructive testing has the advantages of high speed, non-destructiveness, and easy online integration. The application of this technology can qualitatively analyze the defect type and quantitatively infer the relevant characteristics of the defect. It has become one of the mainstream technical means for testing and characterizing the microscopic damage and failure behavior prediction of composite materials.

[0004] At the same time, with the development of indentation detection technology, a residual stress detection technology based on indentation method has emerged, which is a method of evaluating the internal residual stress of a material by performing an indentation test on the surface of the material. This method has the advantages of simple operation and non-destructiveness, so it has been widely used in the field of materials science and engineering.

[0005] However, although there are many types of nondestructive testing technologies that can be used for composite materials and have developed relatively maturely, each technology has its specific application scope and advantages and disadvantages. It is difficult for a single method to detect multiple types of defects. In addition, the research on online nondestructive testing technology for composite material processing surfaces or sub-surfaces has shown a single output parameter, and it is difficult to achieve multi-parameter synchronous and co-location testing of carbon fiber composite material geometry, damage defects, and residual stress on the processing surface or sub-surface. This not only limits the processing and manufacturing accuracy of advanced composite materials, as well as the service durability and stability under complex working conditions, but also seriously restricts the in-depth research work of advanced nondestructive testing technology in many key fields.

[0006] Therefore, the design and development of non-destructive testing instruments that can perform simultaneous and in-situ testing of multiple parameters such as composite material geometry, damage defects, and residual stress is a hot topic and the key to technological breakthroughs in the field of composite material flaw detection. Summary of the invention

[0007] In view of this, the present invention provides a fiber optic eddy current nondestructive testing device coupled with indentation testing, which can realize synchronous co-location testing of multiple parameters such as geometric morphology, damage defects and residual stress of processed surface or sub-surface carbon fiber composite materials. In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] The present invention provides an optical fiber eddy current nondestructive testing device for coupled indentation testing, comprising:

[0009] Base plate;

[0010] A support frame, wherein the support frame is fixedly connected to the bottom plate, and a crossbeam of the support frame is spaced apart from the bottom plate;

[0011] An optical fiber eddy current nondestructive testing module, which is fixed on the crossbeam to detect the surface geometry and internal damage defects of the workpiece;

[0012] A residual stress indentation detection module, wherein the residual stress indentation detection module is fixed on the crossbeam to detect the residual stress inside the workpiece;

[0013] An optical fiber eddy current / indentation detection function switching module, wherein the optical fiber eddy current / indentation detection function switching module is fixed on the bottom plate to adjust the position of the workpiece;

[0014] An adaptive clamp module, wherein the adaptive clamp module is fixed to an end of the optical fiber eddy current / indentation detection function switching module away from the bottom plate and clamps the workpiece;

[0015] The control module is electrically connected to the optical fiber eddy current nondestructive testing module, the residual stress indentation testing module, the optical fiber eddy current / indentation testing function switching module and the adaptive fixture module.

[0016] Furthermore, the optical fiber eddy current nondestructive testing module includes a Z-axis displacement platform I and an optical fiber eddy current nondestructive testing unit, the Z-axis displacement platform I is fixed on the crossbeam, the optical fiber eddy current nondestructive testing unit is fixed on the Z-axis displacement platform I, and the Z-axis displacement platform I drives the optical fiber eddy current nondestructive testing unit to move in a vertical direction.

[0017] Furthermore, the Z-axis displacement platform I includes: a servo motor II, a coupling II, a ball screw module II, a Z-axis displacement platform nut seat I, a guide rail slider module II and a Z-axis displacement platform base I, the output end of the servo motor II is connected to the coupling II, the output end of the coupling II is connected to the ball screw module II, the ball screw module II and the coupling II are arranged inside the Z-axis displacement platform base I and are rotatably connected to the Z-axis displacement platform base I, the Z-axis displacement platform nut seat I is rotatably connected to the ball screw module II, the guide rail slider module II is fixed on the Z-axis displacement platform base I, the Z-axis displacement platform nut seat I slides along the guide rail slider module II, the Z-axis displacement platform base I is fixed on the crossbeam, and the optical fiber eddy current nondestructive testing unit is fixedly connected to the Z-axis displacement platform nut seat I.

[0018] Furthermore, the optical fiber eddy current nondestructive testing unit includes a flexible hinge I, a piezoelectric stack I, a flexible hinge gasket, a hexagonal cylindrical head screw, a hexagonal nut, a clamping probe base, a clamping probe cover and a composite detection probe, wherein the flexible hinge I is a hollow structure, and flexible hinge gaskets are installed at both ends of the flexible hinge I. The piezoelectric stack I is arranged in the flexible hinge I, the hexagonal cylindrical head screw penetrates the flexible hinge I and is fixedly connected to the flexible hinge I through the hexagonal nut, one end of the flexible hinge I is fixedly connected to the Z-axis translation stage nut seat I, and the other end is fixedly connected to the clamping probe base, the clamping probe cover cooperates with the clamping probe base to clamp the composite detection probe, and the clamping probe cover is detachably connected to the clamping probe base.

[0019] Furthermore, limit travel switches II are provided at both ends of the displacement platform base I.

[0020] Furthermore, the composite detection probe includes an optical fiber probe and an eddy current coil, the eddy current coil is coaxially arranged with the optical fiber probe, the end of the optical fiber probe away from the eddy current coil is clamped by the clamping probe base and the clamping probe cover, and the optical fiber probe and piezoelectric stack I are electrically connected to the control module.

[0021] Further, the residual stress indentation detection module includes a Z-axis displacement platform II and a residual stress detection unit, the Z-axis displacement platform II includes: a servo motor III, a coupling III, a ball screw module III, a Z-axis displacement platform nut seat II, a guide rail slider module III and a Z-axis displacement platform base II, the output end of the servo motor III is connected to the coupling III, the output end of the coupling III is connected to the ball screw module III, the ball screw module III and the coupling III are arranged in the Z-axis displacement platform base II and are rotatably connected to the Z-axis displacement platform base II, the Z-axis displacement platform nut seat II is rotatably connected to the ball screw module III, the guide rail slider module III is fixed on the Z-axis displacement platform base II, the Z-axis displacement platform nut seat II slides along the guide rail slider module III, the Z-axis displacement platform base II is fixed on the crossbeam, and the optical fiber eddy current nondestructive testing unit is fixedly connected to the Z-axis displacement platform nut seat II.

[0022] Further, the residual stress detection unit includes a small manual translation stage, a flexible hinge II, a piezoelectric stack II, a hexagonal bolt, a force sensor, a displacement sensor base, a capacitive displacement sensor, a cylindrical pin I, a cylindrical pin II, a displacement measuring plate, an indentation head cover and an indentation head. The small manual translation stage is fixed on one side of the Z-axis translation stage nut seat II, the flexible hinge II is installed and fixed on the end of the Z-axis translation stage nut seat II away from the Z-axis translation stage base II, the piezoelectric stack II is installed in the middle hollow position of the flexible hinge II, one end of the flexible hinge II is screwed into the hexagonal bolt, the displacement sensor base is fixed on the small manual translation stage, the capacitive displacement sensor is installed in the through hole of the displacement sensor base through the cylindrical pin II, one end of the force sensor is threadedly connected to the end of the flexible hinge away from the hexagonal bolt, the other end of the force sensor is threadedly connected to the indentation head cover, the displacement measuring plate is arranged between the indentation head and the force sensor, and the indentation head is fixed to the end of the indentation head cover away from the force sensor through the cylindrical pin I.

[0023] Furthermore, the adaptive fixture module includes an angle table module, a connecting plate, a fractal vise and a detection workpiece, one side of the angle table module is fixed on the fiber optic eddy current / indentation detection function switching module, and the other side is connected to the connecting plate, the fractal vise is fixed on the other side of the connecting plate, and the fractal vise clamps and positions the detection workpiece, the angle table module includes an upper electric angle table I and a lower electric angle table II, the two electric angle tables are cross-arranged, the end of the upper electric angle table I away from the lower electric angle table II is connected to the connecting plate, and the end of the lower electric angle table II away from the upper electric angle table I is fixed to the fiber optic eddy current / indentation detection function switching module.

[0024] Furthermore, a specific test method of a fiber optic eddy current nondestructive testing device coupled with an indentation test is provided.

[0025] S1: The inspection workpiece is clamped on the fractal vise, and the industrial control host computer of the control module sends a signal through the motion controller to control the fiber optic eddy current / indentation detection function switching module to move in the horizontal direction, so that the inspection workpiece reaches the target inspection position, and the industrial control host computer of the control module sends a signal through the motion controller to control the fiber optic eddy current nondestructive testing module and the residual stress indentation detection module to perform a large-scale rough displacement in the vertical direction, so that the composite detection probe reaches the working range and the indentation head reaches the workpiece surface;

[0026] S2: The displacement signal collected by the optical fiber probe in the composite detection probe is processed by the charge amplifier of the control module and then read into the signal acquisition card. Then the signal of the signal acquisition card is transmitted to the industrial control host computer of the control module. After analyzing the displacement feedback signal, the industrial control host computer sends a precise rotation motion instruction to the angle table module.

[0027] S3: During the scanning of workpieces with complex geometric shapes, the industrial control host computer analyzes the displacement signal collected by the optical fiber probe and then sends a feedback control signal to the piezoelectric stack I through the piezoelectric amplifier of the control module, so that the flexible hinge I produces micro-movement and adjusts the distance between the composite detection probe and the workpiece surface;

[0028] S4: Analyze the displacement feedback signal of the optical fiber probe during scanning through the industrial control host computer to obtain the surface defect damage;

[0029] S5: For the detection of residual stress inside the workpiece, the indentation method is adopted. First, the capacitive displacement sensor is adjusted to within the measuring range through a small manual displacement stage. The moment the indentation head touches the surface of the workpiece, the force sensor collects the load signal change. The load signal is amplified by the charge amplifier and read into the signal acquisition card, and then transmitted to the industrial control host computer. After analysis, the industrial control host computer sends a motion command to the motion controller to the Z-axis displacement platform II to stop it. Then the capacitive displacement sensor sends a displacement feedback signal, and the signal is transmitted to the industrial control host computer in the same way. After the host computer analyzes the signal, it sends a feedback control signal to the piezoelectric stack II through the piezoelectric amplifier to control the continuous micro-movement of the indentation head. At the same time, the force sensor continuously monitors the load change of the indentation head, and the load feedback signal is amplified by the charge amplifier and read into the signal acquisition card, and then transmitted to the industrial control host computer. The load displacement curve of the material is obtained through the calculation and analysis of the industrial control host computer, and the specific relationship between the residual stress and the indentation response parameters is established, so as to make qualitative and quantitative detection of the residual stress;

[0030] S6: For the detection of internal damage defects of workpieces and the verification of residual stress, the signal generator generates a high-frequency waveform, which is then passed through a power amplifier and then sent out an excitation signal through an eddy current coil. The eddy current coil then processes the received eddy current signal through a power amplifier and a phase-locked amplifier and reads it into a signal acquisition card, which is finally transmitted to the relevant analysis software of the industrial control host computer for calculation and analysis.

[0031] It can be seen from the above technical scheme that compared with the prior art, the present invention discloses a fiber optic eddy current nondestructive testing device for coupled indentation testing, which detects the surface geometric morphology of the workpiece through the fiber optic eddy current nondestructive testing module, detects the internal residual stress of the workpiece through the residual stress indentation detection module, adjusts the position of the workpiece through the fiber optic eddy current / indentation detection function switching module, clamps the workpiece through the adaptive clamp module, and controls the fiber optic eddy current nondestructive testing module, the residual stress indentation detection module, the fiber optic eddy current / indentation detection function switching module and the adaptive clamp module through the control module, so as to realize the synchronous and in-situ testing of multiple parameters such as the geometric morphology, damage defects and residual stress of the processed surface or sub-surface carbon fiber composite material. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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 or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0033] Figure 1 A three-dimensional structural diagram of the optical fiber eddy current nondestructive testing device for coupled indentation testing provided by the present invention;

[0034] Figure 2 A front view of the optical fiber eddy current nondestructive testing device for coupled indentation testing provided by the present invention;

[0035] Figure 3 A side view of the optical fiber eddy current nondestructive testing device for coupled indentation testing provided by the present invention;

[0036] Figure 4 A top view of the optical fiber eddy current nondestructive testing device for coupled indentation testing provided by the present invention;

[0037] Figure 5 A front view of an adaptive fixture module in an optical fiber eddy current nondestructive testing device for coupled indentation testing provided by the present invention;

[0038] Figure 6 A front view of a fiber optic eddy current nondestructive testing module in a fiber optic eddy current nondestructive testing device for coupled indentation testing provided by the present invention;

[0039] Figure 7 A front view of a residual stress indentation detection module in an optical fiber eddy current nondestructive testing device for coupled indentation testing provided by the present invention;

[0040] Figure 8 An exploded diagram of an optical fiber eddy current nondestructive testing unit in an optical fiber eddy current nondestructive testing device for coupled indentation testing provided by the present invention;

[0041] Fig. 9 A front view of a composite detection probe in an optical fiber eddy current nondestructive testing device for coupled indentation testing provided by the present invention;

[0042] Fig.10 An exploded diagram of a residual stress detection unit in an optical fiber eddy current nondestructive testing device for coupled indentation testing provided by the present invention;

[0043] Fig.11 This is a schematic diagram of the detection method of the optical fiber eddy current nondestructive testing device for coupled indentation testing provided by the present invention.

[0044] In the figure: 1. Fiber optic eddy current nondestructive testing module; 11. Z-axis displacement platform Ⅰ; 111. servo motor Ⅱ; 112. coupling Ⅱ; 113. ball screw module Ⅱ; 114. guide rail slider module Ⅱ; 115. Z-axis displacement platform nut seat Ⅰ; 116. limit travel switch Ⅱ; 117. Z-axis displacement platform base Ⅰ; 12. Fiber optic eddy current nondestructive testing unit; 121. flexible hinge Ⅰ; ​​122. hexagonal nut; 123. piezoelectric stack Ⅰ; 124. flexible hinge gasket; 125. hexagon socket head screw; 126. clamping Probe cover; 127, composite detection probe; 1271, optical fiber probe; 1272, eddy current coil; 128, clamping probe base; 2, residual stress indentation detection module; 21, Z-axis displacement platform II; 211, servo motor III; 212, coupling III; 213, ball screw module III; 214, guide rail slider module III; 215, Z-axis displacement platform nut seat II; 216, limit travel switch III; 217, Z-axis displacement platform base II; 22, residual stress detection unit; 221, flexible hinge II; 222, hexagon 1. Head bolt; 223, piezoelectric stack II; 224, small manual translation stage; 225, displacement sensor base; 226, capacitive displacement sensor; 227, cylindrical pin II; 228, displacement plate; 229, indentation head; 2210, cylindrical pin I; 2211, indentation head cover; 2212, force sensor; 3, fiber optic eddy current / indentation detection function switching module; 31, X-axis linear motion platform; 311, X-axis translation stage nut seat; 32, support platform; 321, support platform connection seat; 33, Y-axis linear motion platform; 3 31. Servo motor I; 332. Coupling I; 333. Ball screw module I; 334. Y-axis translation stage base; 335. Y-axis translation stage nut seat; 336. Guide rail slider module I; 337. Encoder bracket; 338. Encoder; 339. Linear grating ruler; 3310. Limit travel switch I; 4. Adaptive fixture module; 41. Angle table module; 411. Electric angle table II; 412. Electric angle table I; 42. Connecting plate; 43. Fractal vise; 44. Detection workpiece; 5. Crossbeam; 6. Bottom plate. DETAILED DESCRIPTION

[0045] 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.

[0046] See also Figure 1-11 The embodiment of the present invention discloses a fiber optic eddy current nondestructive testing device coupled with an indentation test, comprising:

[0047] Bottom plate 6;

[0048] The support frame is fixedly connected to the bottom plate 6, and the crossbeam 5 of the support frame is spaced apart from the bottom plate 6;

[0049] The optical fiber eddy current nondestructive testing module 1 is fixed on the crossbeam 5 to detect the surface geometry and internal damage defects of the workpiece 44;

[0050] A residual stress indentation detection module 2, which is fixed on the crossbeam 5 to detect the residual stress inside the workpiece 44;

[0051] The optical fiber eddy current / indentation detection function switching module 3 is fixed on the bottom plate 6 to adjust the position of the detection workpiece 44;

[0052] An adaptive clamp module 4, which is fixed to an end of the optical fiber eddy current / indentation detection function switching module 3 away from the bottom plate 6 and clamps the detection workpiece 44;

[0053] The control module, the fiber optic eddy current nondestructive testing module 1, the residual stress indentation testing module 2, the fiber optic eddy current / indentation testing function switching module 3 and the adaptive fixture module 4 are all electrically connected to the control module.

[0054] In some embodiments, the optical fiber eddy current nondestructive testing module 1 includes a Z-axis displacement platform Ⅰ11 and an optical fiber eddy current nondestructive testing unit 12, the Z-axis displacement platform Ⅰ11 is fixed on the beam 5, the optical fiber eddy current nondestructive testing unit 12 is fixed on the Z-axis displacement platform Ⅰ11, and the Z-axis displacement platform Ⅰ11 drives the optical fiber eddy current nondestructive testing unit 12 to move in the vertical direction.

[0055] The Z-axis displacement platform Ⅰ11 includes: a servo motor Ⅱ111, a coupling Ⅱ112, a ball screw module Ⅱ113, a Z-axis displacement platform nut seat Ⅰ115, a guide rail slider module Ⅱ114 and a Z-axis displacement platform base Ⅰ117. The output end of the servo motor Ⅱ111 is connected to the coupling Ⅱ112, and the output end of the coupling Ⅱ112 is connected to the ball screw module Ⅱ113. The ball screw module Ⅱ113 and the coupling Ⅱ112 are arranged on the Z-axis displacement platform base. The interior of Ⅰ117 is rotatably connected to the Z-axis translation stage base Ⅰ117, the Z-axis translation stage nut seat Ⅰ115 is rotatably connected to the ball screw module Ⅱ113, the guide rail slider module Ⅱ114 is fixed on the Z-axis translation stage base Ⅰ117, the Z-axis translation stage nut seat Ⅰ115 slides along the guide rail slider module Ⅱ114, the Z-axis translation stage base Ⅰ117 is fixed on the beam 5, and the optical fiber eddy current nondestructive testing unit 12 is fixedly connected to the Z-axis translation stage nut seat Ⅰ115.

[0056] The optical fiber eddy current nondestructive testing unit 12 includes a flexible hinge Ⅰ121, a piezoelectric stack Ⅰ123, a flexible hinge gasket 124, a hexagon socket head screw 125, a hexagon nut 122, a clamping probe base 128, a clamping probe cover 126 and a composite detection probe 127. The flexible hinge Ⅰ121 is a hollow structure, and the flexible hinge gaskets 124 are installed at both ends of the flexible hinge Ⅰ121. The piezoelectric stack Ⅰ123 is arranged in the flexible hinge Ⅰ121. The cylindrical head screw 125 passes through the flexible hinge Ⅰ121 and is fixedly connected to the flexible hinge Ⅰ121 through the hexagonal nut 122. One end of the flexible hinge Ⅰ121 is fixedly connected to the Z-axis translation stage nut seat Ⅰ115, and the other end is fixedly connected to the clamping probe base 128. The clamping probe cover plate 126 and the clamping probe base 128 cooperate to clamp the composite detection probe 127. The clamping probe cover plate 126 and the clamping probe base 128 are detachably connected.

[0057] In some embodiments, limit travel switches II 116 are provided at both ends of the translation stage base I.

[0058] In some embodiments, the servo motor II 111 drives the Z-axis translation stage nut seat I 115 and the fiber optic eddy current nondestructive testing unit 12 to perform a rough large-stroke linear displacement in the vertical direction. Two limit travel switches II 116 are fixed on both sides of the Z-axis translation stage base I 117 to limit the range of movement of the guide rail slider module II 114 to avoid interference and collision.

[0059] The flexible hinge I121 is driven by the piezoelectric stack I123 to produce micro-movement, thereby precisely adjusting the displacement of the composite detection probe 127 in the Z-axis direction to ensure that the lifting distance of the composite detection probe 127 is constant, thereby solving the inherent lift-off effect and poor adaptability problems during eddy current detection of workpieces with complex geometric morphology.

[0060] The hexagonal nut 122 is tightened to apply a pre-tightening force to the piezoelectric stack I 123 , and the clamping probe base 128 and the clamping probe cover 126 are clamped to fix the composite detection probe 127 , so that damage scanning of the detection workpiece 44 is achieved through the composite detection probe 127 .

[0061] In some embodiments, the composite detection probe 127 includes a fiber optic probe 1271 and an eddy current coil 1272. The eddy current coil 1272 is coaxially arranged with the fiber optic probe. The end of the fiber optic probe away from the eddy current coil 1272 is clamped by a clamping probe base 128 and a clamping probe cover 126. The fiber optic probe 1271 and the piezoelectric stack I 123 are electrically connected to the control module.

[0062] In some embodiments, the residual stress indentation detection module 2 includes a Z-axis displacement platform II 21 and a residual stress detection unit 22. The Z-axis displacement platform II 21 includes: a servo motor III 211, a coupling III 212, a ball screw module III 213, a Z-axis displacement platform nut seat II 215, a guide rail slider module III 214 and a Z-axis displacement platform base II 217. The output end of the servo motor III 211 is connected to the coupling III 212, the output end of the coupling III 212 is connected to the ball screw module III 213, and the ball screw module III 213 and the coupling III212 are arranged in the Z-axis translation stage base II217 and are rotatably connected to the Z-axis translation stage base II217, the Z-axis translation stage nut seat II215 is rotatably connected to the ball screw module III213, the guide rail slider module III214 is fixed on the Z-axis translation stage base II217, the Z-axis translation stage nut seat II215 slides along the guide rail slider module III214, the Z-axis translation stage base II217 is fixed on the beam 5, and the optical fiber eddy current nondestructive testing unit 12 is fixedly connected to the Z-axis translation stage nut seat II215.

[0063] The residual stress detection unit 22 includes a small manual translation stage 224, a flexible hinge II 221, a piezoelectric stack II 223, a hexagonal bolt 222, a force sensor 2212, a displacement sensor base 225, a capacitive displacement sensor 226, a cylindrical pin I 2210, a cylindrical pin II 227, a displacement measuring plate 228, an indentation head cover 2211 and an indentation head 229. The small manual translation stage 224 is fixed to one side of the Z-axis translation stage nut seat II 215, the flexible hinge II 221 is fixed to one end of the Z-axis translation stage nut seat II 215 away from the Z-axis translation stage base II 217, and the piezoelectric stack II 223 is installed in the middle of the flexible hinge II 221 In the hollow position, one end of the flexible hinge II 221 is screwed into the hexagonal bolt 222, the displacement sensor base 225 is fixed on the small manual displacement stage 224, and the capacitive displacement sensor 226 is installed in the through hole of the displacement sensor base 225 through the cylindrical pin II 227. One end of the force sensor 2212 is threadedly connected to the end of the flexible hinge away from the hexagonal bolt, and the other end of the force sensor 2212 is threadedly connected to the indentation head cover 2211. The displacement measuring plate 228 is arranged between the indentation head 229 and the force sensor 2212, and the indentation head 229 is fixed to the end of the indentation head cover 2211 away from the force sensor 2212 through the cylindrical pin I 2210.

[0064] In some embodiments, the small manual translation stage 224 is manually controlled to adjust the distance between the probe of the capacitive displacement sensor 226 and the displacement measuring plate 228 to within the measuring range of the capacitive displacement sensor 226, and the piezoelectric stack II 223 drives the flexible hinge II 221 to move slightly, thereby controlling the indentation head 229 to cooperate with the displacement signal measured by the capacitive displacement sensor 226 to make an indentation on the surface of the test workpiece 44, and the force sensor 2212 captures the load signal change at the moment when the indentation head 229 contacts the surface of the test workpiece 44, and cooperates with the capacitive displacement sensor 226 to obtain the corresponding values ​​of the displacement and load of the indentation head 229 during the indentation process.

[0065] In some embodiments, the optical fiber eddy current / indentation detection function switching module 3 includes an X-axis linear motion platform 31, a Y-axis linear motion platform 33 and a support platform 32. The Y-axis linear motion platform 33 includes a servo motor I 331, a coupling I 332, a ball screw module I 333, a Y-axis translation stage base 334, a Y-axis translation stage nut seat 335, a guide rail slider module I 336, an encoder bracket 337, an encoder 338 and a linear grating ruler 339. The output end of the servo motor I 331 is connected to the input end of the coupling I 332, and the output end of the coupling is connected to the ball screw module I 333. The Y-axis translation stage nut seat 335 cooperates with the ball screw module I 333 and the guide rail slider module I 336 to achieve sliding. The encoder bracket 337 is installed Installed on the Y-axis translation stage nut seat 335, the encoder 338 is installed on the encoder bracket 337, the linear grating ruler 339 is installed at the stroke end of the Y-axis translation stage base 334, the displacement of the detection workpiece 44 is detected by the linear grating ruler 339, and the displacement data of the detection workpiece 44 is output through the encoder 338. The Y-axis translation stage base 334 is connected to the X-axis motion platform through the X-axis translation stage nut seat 311, the Y-axis translation stage base 334 is connected to the support platform 32 through the support platform connecting seat 321, the X-axis linear motion platform 31 and the Y-axis linear motion platform 33 have the same structure, the Y-axis translation stage base 334 is slidably connected with the X-axis motion platform and the support platform 32, and the base of the X-axis motion platform and the base of the support platform 32 are both installed on the base plate 6.

[0066] The X-axis linear motion platform 31 realizes the linear displacement of the parts installed on the Y-axis translation stage nut seat 335 in the X-axis direction, the support platform 32 supports the load, and the Y-axis linear motion platform 33 is connected to the adaptive fixture module 4 through the Y-axis translation stage nut seat 335 to realize the displacement of the adaptive fixture module 4 in the Y-axis direction.

[0067] In some embodiments, the adaptive fixture module 4 includes an angle table module 41, a connecting plate 42, a fractal vise 43 and a detection workpiece 44. One side of the angle table module 41 is fixed on the optical fiber eddy current / indentation detection function switching module 3, and the other side is connected to the connecting plate 42. The fractal vise 43 is fixed on the other side of the connecting plate 42. The fractal vise 43 clamps and positions the detection workpiece 44. The angle table module 41 includes an upper electric angle table I 412 and a lower electric angle table II 411. The two electric angle tables are arranged in a cross shape. The end of the upper electric angle table I 412 away from the lower electric angle table II 411 is connected to the connecting plate 42, and the end of the lower electric angle table II 411 away from the upper electric angle table I 412 is fixed on the optical fiber eddy current / indentation detection function switching module 3.

[0068] In some embodiments, the angle table module 41 realizes the angle adjustment of the detection workpiece 44, so that the distance between the compound detection probe 127 and the surface of the detection workpiece 44 in both the XZ and YZ planes is minimized, thereby solving the problem of the tilted installation angle of the compound detection probe 127.

[0069] Limit travel switches I 3310 are provided at both ends of the Y-axis translation stage base 334 .

[0070] Limit travel switches III 216 are provided at both ends of the Z-axis translation stage base II 217.

[0071] The specific testing method of the present invention is as follows: S1: the detection workpiece 44 is clamped on the fractal vise 43, and the industrial control host computer of the control module sends a signal through the motion controller to control the optical fiber eddy current / indentation detection function switching module 3 to move in the horizontal direction, so that the detection workpiece 44 reaches the target detection position, and the industrial control host computer of the control module sends a signal through the motion controller of the control module to control the optical fiber eddy current nondestructive detection module 1 and the residual stress indentation detection module 2 to perform a large-scale rough displacement in the vertical direction, so that the composite detection probe 127 reaches within the working range and the indentation head 229 reaches the workpiece surface;

[0072] S2: The displacement signal collected by the optical fiber probe 1271 in the composite detection probe 127 is processed by the charge amplifier of the control module and then read into the signal acquisition card of the control module. Then, the signal of the signal acquisition card is transmitted to the industrial control host computer of the control module. After analyzing the displacement feedback signal, the industrial control host computer sends a precise rotation motion instruction to the angle table module 41, so that the distance between the composite detection probe 127 and the surface of the detection workpiece 44 in both the XZ and YZ planes is minimized, thereby solving the problem of the tilt of the probe installation angle.

[0073] S3: During scanning of a workpiece with complex geometric morphology, the industrial control host computer analyzes the displacement signal collected by the optical fiber probe 1271 and then sends a feedback control signal to the piezoelectric stack I 123 through the piezoelectric amplifier of the control module, so that the flexible hinge I 121 produces micro-movement, thereby adjusting the distance between the composite detection probe 127 and the workpiece surface;

[0074] S4: Analyze the displacement feedback signal of the optical fiber probe 1271 during the scanning process through the industrial control host computer to obtain the surface defect damage;

[0075] S5: For the detection of residual stress inside the workpiece 44, the indentation method is adopted. First, the capacitive displacement sensor 226 is adjusted to within the range through the small manual displacement stage 224. The moment the indentation head 229 touches the surface of the workpiece 44, the force sensor 2212 collects the load signal change. The load signal is amplified by the charge amplifier and read into the signal acquisition card, and then transmitted to the industrial control host computer. After analysis, the industrial control host computer sends a motion command to the Z-axis displacement platform II 21 to stop it. Then the capacitive displacement sensor 226 sends a displacement feedback signal. The signal is The signal is transmitted to the industrial control host computer in the same way. After the host computer analyzes the signal, it sends a feedback control signal to the piezoelectric stack II 223 through the piezoelectric amplifier to control the continuous micro-movement of the indentation head 229. At the same time, the force sensor 2212 continuously monitors the load change of the indentation head 229, and amplifies the load feedback signal through the charge amplifier and reads it into the signal acquisition card, which is then transmitted to the industrial control host computer. The load displacement curve of the material is obtained through calculation and analysis by the industrial control host computer, and the specific relationship between the residual stress and the indentation response parameter is established, so as to make qualitative and quantitative detection of the residual stress.

[0076] S6: For the detection of internal damage defects of the workpiece 44 and the verification of residual stress, a high-frequency waveform is generated by a signal generator. The waveform passes through a power amplifier and then sends an excitation signal through the eddy current coil 1272. The eddy current coil 1272 then processes the received eddy current signal through a power amplifier and a phase-locked amplifier and reads it into a signal acquisition card, which is finally transmitted to the relevant analysis software of the industrial control host computer for calculation and analysis.

[0077] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0078] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An optical fiber eddy current nondestructive testing device coupled with indentation testing, characterized in that: include: Base plate; A support frame, wherein the support frame is fixedly connected to the bottom plate, and a crossbeam of the support frame is spaced apart from the bottom plate; An optical fiber eddy current nondestructive testing module, which is fixed on the crossbeam to detect the surface geometry and internal damage defects of the workpiece; A residual stress indentation detection module, wherein the residual stress indentation detection module is fixed on the crossbeam to detect the residual stress inside the workpiece; An optical fiber eddy current or indentation detection function switching module, wherein the optical fiber eddy current or indentation detection function switching module is fixed on the bottom plate to adjust the position of the workpiece; An adaptive fixture module, wherein the adaptive fixture module is fixed to an end of the optical fiber eddy current or indentation detection function switching module away from the base plate and clamps the workpiece; A control module, the optical fiber eddy current nondestructive testing module, the residual stress indentation testing module, the optical fiber eddy current or indentation testing function switching module and the adaptive fixture module are all electrically connected to the control module; The optical fiber eddy current nondestructive testing module includes a Z-axis displacement platform I and an optical fiber eddy current nondestructive testing unit, wherein the Z-axis displacement platform I is fixed on the crossbeam, and the optical fiber eddy current nondestructive testing unit is fixed on the Z-axis displacement platform I, and the Z-axis displacement platform I drives the optical fiber eddy current nondestructive testing unit to move in the vertical direction; The Z-axis displacement platform I comprises: a servo motor II, a coupling II, a ball screw module II, a Z-axis displacement platform nut seat I, a guide rail slider module II and a Z-axis displacement platform base I, the output end of the servo motor II is connected to the coupling II, the output end of the coupling II is connected to the ball screw module II, the ball screw module II and the coupling II are arranged inside the Z-axis displacement platform base I and are rotatably connected to the Z-axis displacement platform base I, the Z-axis displacement platform nut seat I is rotatably connected to the ball screw module II, the guide rail slider module II is fixed on the Z-axis displacement platform base I, the Z-axis displacement platform nut seat I slides along the guide rail slider module II, the Z-axis displacement platform base I is fixed on the crossbeam, and the optical fiber eddy current nondestructive testing unit is fixedly connected to the Z-axis displacement platform nut seat I; The optical fiber eddy current nondestructive testing unit includes a flexible hinge I, a piezoelectric stack I, a flexible hinge gasket, a hexagon socket cylindrical head screw, a hexagonal nut, a clamping probe base, a clamping probe cover plate and a composite detection probe, wherein the flexible hinge I is a hollow structure, and flexible hinge gaskets are installed at both ends of the flexible hinge I, the piezoelectric stack I is arranged in the flexible hinge I, the hexagon socket cylindrical head screw passes through the flexible hinge I and is fixedly connected to the flexible hinge I through the hexagonal nut, one end of the flexible hinge I is fixedly connected to the Z-axis translation stage nut seat I, and the other end is fixedly connected to the clamping probe base, the clamping probe cover plate cooperates with the clamping probe base to clamp the composite detection probe, and the clamping probe cover plate is detachably connected to the clamping probe base; The residual stress indentation detection module includes a Z-axis displacement platform II and a residual stress detection unit. The Z-axis displacement platform II includes: a servo motor III, a coupling III, a ball screw module III, a Z-axis displacement platform nut seat II, a guide rail slider module III and a Z-axis displacement platform base II. The output end of the servo motor III is connected to the coupling III, and the output end of the coupling III is connected to the ball screw module III. The ball screw module III and the coupling III are arranged in the Z-axis displacement platform base II and are rotatably connected to the Z-axis displacement platform base II. The Z-axis displacement platform nut seat II is rotatably connected to the ball screw module III. The guide rail slider module III is fixed on the Z-axis displacement platform base II. The Z-axis displacement platform nut seat II slides along the guide rail slider module III. The Z-axis displacement platform base II is fixed on the crossbeam, and the optical fiber eddy current nondestructive detection unit is fixedly connected to the Z-axis displacement platform nut seat II. The residual stress detection unit includes a small manual translation stage, a flexible hinge II, a piezoelectric stack II, a hexagonal bolt, a force sensor, a displacement sensor base, a capacitive displacement sensor, a cylindrical pin I, a cylindrical pin II, a displacement measuring plate, an indentation head cover and an indentation head. The small manual translation stage is fixed on one side of a nut seat II of a Z-axis translation stage, the flexible hinge II is fixedly installed on one end of the nut seat II of the Z-axis translation stage away from the base II of the Z-axis translation stage, the piezoelectric stack II is installed in the middle hollow position of the flexible hinge II, one end of the flexible hinge II is screwed into the hexagonal bolt, the displacement sensor base is fixed on the small manual translation stage, the capacitive displacement sensor is installed in the through hole of the displacement sensor base through the cylindrical pin II, one end of the force sensor is threadedly connected to one end of the flexible hinge away from the hexagonal bolt, the other end of the force sensor is threadedly connected to the indentation head cover, the displacement measuring plate is arranged between the indentation head and the force sensor, and the indentation head is fixed to one end of the indentation head cover away from the force sensor through the cylindrical pin I.

2. The optical fiber eddy current nondestructive testing device for coupled indentation testing according to claim 1, characterized in that: The two ends of the displacement platform base Ⅰ are provided with limit travel switches Ⅱ.

3. The optical fiber eddy current nondestructive testing device for coupled indentation testing according to claim 1, characterized in that: The composite detection probe includes a fiber optic probe and an eddy current coil. The eddy current coil is coaxially arranged with the fiber optic probe. The end of the fiber optic probe away from the eddy current coil is clamped by the clamping probe base and the clamping probe cover. The fiber optic probe and the piezoelectric stack I are electrically connected to the control module.

4. The optical fiber eddy current nondestructive testing device for coupled indentation testing according to claim 1, characterized in that: The adaptive fixture module includes an angle table module, a connecting plate, a fractal vise and a detection workpiece. One side of the angle table module is fixed on the fiber optic eddy current or indentation detection function switching module, and the other side is connected to the connecting plate. The fractal vise is fixed on the other side of the connecting plate. The fractal vise clamps and positions the detection workpiece. The angle table module includes an upper electric angle table I and a lower electric angle table II. The two electric angle tables are arranged in a cross shape. The end of the upper electric angle table I away from the lower electric angle table II is connected to the connecting plate, and the end of the lower electric angle table II away from the upper electric angle table I is fixed to the fiber optic eddy current or indentation detection function switching module.

5. A method for testing an optical fiber eddy current nondestructive testing device coupled with an indentation test, characterized in that: The testing method uses the optical fiber eddy current nondestructive testing device for coupled indentation testing according to any one of claims 1 to 4, and the testing method comprises: S1: The inspection workpiece is clamped on the fractal vise, and the industrial control host computer of the control module sends a signal through the motion controller to control the fiber optic eddy current or indentation detection function switching module to move in the horizontal direction, so that the inspection workpiece reaches the target inspection position, and the industrial control host computer of the control module sends a signal through the motion controller to control the fiber optic eddy current nondestructive testing module and the residual stress indentation detection module to perform a large-scale rough displacement in the vertical direction, so that the composite detection probe reaches the working range and the indentation head reaches the workpiece surface; S2: The displacement signal collected by the optical fiber probe in the composite detection probe is processed by the charge amplifier of the control module and then read into the signal acquisition card. Then the signal of the signal acquisition card is transmitted to the industrial control host computer. After analyzing the displacement feedback signal, the industrial control host computer sends a precise rotation motion instruction to the angular stage module through the motion controller; S3: During the scanning of workpieces with complex geometric shapes, the industrial control host computer analyzes the displacement signal collected by the optical fiber probe and then sends a feedback control signal to the piezoelectric stack I through the piezoelectric amplifier of the control module, so that the flexible hinge I produces micro-movement and adjusts the distance between the composite detection probe and the workpiece surface; S4: Analyze the displacement feedback signal of the optical fiber probe during scanning through the industrial control host computer to obtain the surface defect damage; S5: For the detection of residual stress inside the workpiece, the indentation method is adopted. First, the capacitive displacement sensor is adjusted to within the measuring range through a small manual displacement stage. The moment the indentation head touches the surface of the workpiece, the force sensor collects the load signal change. The load signal is amplified by the charge amplifier and read into the signal acquisition card, and then transmitted to the industrial control host computer. After analysis, the industrial control host computer sends a motion command to the Z-axis displacement platform II to stop it. Then the capacitive displacement sensor sends a displacement feedback signal, and the signal is transmitted to the industrial control host computer in the same way. After the host computer analyzes the signal, it sends a feedback control signal to the piezoelectric stack II through the piezoelectric amplifier to control the continuous micro-movement of the indentation head. At the same time, the force sensor continuously monitors the load change of the indentation head, and the load feedback signal is amplified by the charge amplifier and read into the signal acquisition card, and then transmitted to the industrial control host computer. The load displacement curve of the material is obtained through the calculation and analysis of the industrial control host computer, and the specific relationship between the residual stress and the indentation response parameters is established, so as to make qualitative and quantitative detection of the residual stress; S6: For the detection of internal damage defects of workpieces and the verification of residual stress, the signal generator generates a high-frequency waveform, which is then passed through a power amplifier and then sent out an excitation signal through an eddy current coil. The eddy current coil then processes the received eddy current signal through a power amplifier and a phase-locked amplifier and reads it into a signal acquisition card, which is finally transmitted to the relevant analysis software of the industrial control host computer for calculation and analysis.

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