A device and method for bidirectional compression mechanical testing of non-metallic materials

Abstract

The application provides a bidirectional compression mechanics testing device and method for non-metal materials, and relates to the technical field of bidirectional compression mechanics testing, and comprises a main body frame, a supporting seat, a downward pressing assembly, a suspension frame and a data acquisition module. According to the application, two sliding pressure plates with a sliding angle are adopted, the suspension frame hinders the downward sliding of the sliding pressure plates, the double-end screw rod can be adjusted to the position of hindering the downward movement of the metal belt, when the telescopic member drives the support frame assembly to move downward, the two groups of sliding pressure plates will not collide with the L-shaped support system downward, that is, there is no sliding fitting part between the two groups of sliding pressure plates, and the direct stress between the two groups of sliding pressure plates and the L-shaped support system will not be caused during the loading experiment, the pressure measured by the pressure sensor is ensured to be transmitted by the test sample (the test sample with a square cross section), and therefore, the accuracy of data acquisition is ensured, and the reliability of the test experiment is improved.

Description

Technical Field

[0001] This invention relates to a new non-metallic material testing tool, and more specifically to the field of biaxial compression mechanics testing technology, and more specifically to a biaxial compression mechanics testing device and method for non-metallic materials. Background Technology

[0002] Non-metallic materials (such as composite materials, polymer materials, ceramics, etc.) are increasingly widely used in aerospace, automotive industries, and other fields. Accurate testing of their biaxial compressive mechanical properties is crucial for material design and reliability assessment. Traditional uniaxial compression tests cannot simulate the multiaxial stress state of materials under actual working conditions, resulting in poor practical applicability of the test results. Therefore, it is necessary to design and develop biaxial compressive mechanical testing devices and methods.

[0003] According to the principle of biaxial loading, it can be divided into two categories: (1) biaxial loading using two independent loading systems; (2) biaxial loading using a single-axis loading system. The first type of device is implemented by two independent loading systems. Its test equipment is complex in structure, expensive, and has high requirements for the control system. The traditional standardized test application of this type of equipment is not conducive to the efficient conduct of the experiment. The second type of device mainly uses a certain external mechanical structure or test fixture to realize biaxial loading, such as two interlocking L-shaped fixtures for loading. During the experiment, it was found that due to the sliding fit between the two interlocking L-shaped fixtures, the instability during the loading experiment made it impossible to control the friction between the two interlocking L-shaped fixtures, resulting in deviation of the experimental data. Therefore, this invention provides a biaxial compression mechanics test device and method for non-metallic materials. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a bidirectional compression mechanics testing device and method for non-metallic materials, which solves the problem of instability during loading experiments, where the frictional force between the two interlocking L-shaped clamps cannot be controlled, leading to deviations in experimental data.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A bidirectional compression mechanics testing apparatus for non-metallic materials, comprising:

[0007] The main frame is frame-shaped / U-shaped;

[0008] The support base includes: a support column fixedly connected to the bottom plate of the main frame, a support bracket slidably sleeved on the top of the support column, and a pressure sensor installed between the bottom of the support bracket and the top of the support column. The top of the support bracket is provided with an L-shaped support system, and the axis of the support column is located within the symmetry plane of the L-shaped support system.

[0009] The pressing assembly is located above the support base. The pressing assembly includes: a telescopic component, a displacement sensor, a support frame assembly, a sliding pressure plate, and a metal strip. The telescopic component is fixedly connected to the top plate of the main frame. The displacement sensor is installed on the fixed part of the telescopic component and is used to measure the telescopic component's extension and contraction. The support frame assembly is fixedly installed at the bottom telescopic end of the telescopic component. The sliding pressure plate is slidably installed on the inner side of the support frame assembly. Two sets of sliding pressure plates are symmetrically arranged. The tops of the two sets of sliding pressure plates are connected by a metal strip. The symmetrical plane of the two sets of sliding pressure plates coincides with the symmetrical plane of the L-shaped support system.

[0010] The suspension bracket is fixedly installed on the main frame and has an adjustable double-headed screw arranged laterally below the metal strip.

[0011] The data acquisition module is used to acquire experimental data from the pressure sensor and the displacement sensor.

[0012] Preferably, the main frame includes:

[0013] A U-shaped frame, wherein bottom support systems are fixedly installed on both sides of the bottom of the U-shaped frame;

[0014] The top frame is fixedly installed on the top of the U-shaped frame.

[0015] Preferably, the support column includes:

[0016] The chassis is fixedly mounted on the base plate of the U-shaped frame, and a threaded seat is fixedly mounted on the flange of the chassis;

[0017] A connecting shaft, the bottom end of which is fixedly mounted on a threaded seat;

[0018] The support bracket includes: a sleeve, the top end of which is closed, and an L-shaped support system is fixedly installed on the top end of the sleeve;

[0019] The sleeve is fitted onto the top end of the connecting shaft.

[0020] Preferably, the connecting shaft includes:

[0021] The top shaft segment and bottom shaft segment are integrally set, and a hexagonal part is fixedly provided at the junction of the top shaft segment and the bottom shaft segment. The bottom shaft segment is threadedly engaged with the threaded seat.

[0022] The top shaft segment has a first sliding groove on its side that communicates with the top end of the top shaft segment, and a receiving groove on its side that communicates with the side of the first sliding groove.

[0023] A limiting slider is slidably disposed on the inner side of the first slide groove. The side of the limiting slider corresponds to the side of the receiving groove. A side opening is provided on the side of the first slide groove and below the receiving groove. An elastic plate is fixedly connected to the inner side of the limiting slider and inside the side opening. A positioning hole is provided at the end of the elastic plate away from the limiting slider.

[0024] The bottom end of the bottom shaft section is provided with a bottom hole, the top end of the bottom hole is connected to the side opening, a long screw is installed in the internal thread of the bottom hole, and a short shaft corresponding to the positioning hole is fixedly connected to the top end of the long screw.

[0025] A sliding block with a length shorter than the length of the receiving groove is fixedly connected to the inner side of the sleeve.

[0026] Preferably, the telescopic component has a flange on its side, the flange is located below the top frame, and the flange of the telescopic component is fixedly installed to the top frame by multiple sets of bolts.

[0027] Preferably, the support assembly includes:

[0028] The upper support frame is fixedly installed at the bottom telescopic end of the telescopic component;

[0029] An inner support frame is fixedly installed on the inner top of the upper support frame;

[0030] The sliding pressure plate is slidably engaged with the upper support frame and the inner support frame via a T-shaped structure.

[0031] The upper support includes:

[0032] The cylindrical part is threadedly connected to the telescopic rod of the telescopic component, and a locking nut is threadedly installed on the telescopic rod of the telescopic component above the cylindrical part.

[0033] The frame is fixedly installed at the bottom of the cylinder.

[0034] Preferably, the frame includes a horizontal section, and both sides of the horizontal section are fixedly connected to a first bending section extending downward and outward, and the sides of the first bending section are fixedly connected to a second bending section extending downward and inward.

[0035] A reinforcing member is fixedly provided between the second bend and the first bend;

[0036] The sliding pressure plate slides into contact with the bottom end of the second bend.

[0037] Preferably, the metal strip comprises:

[0038] A multi-layered long strip, wherein the two ends of the multi-layered long strip are formed into compacted sections by a welding and compaction process;

[0039] The two ends of the multi-layer long belt are fixed to the top of the two sliding pressure plates by screws through T-shaped connectors.

[0040] This invention provides a biaxial compression mechanical testing apparatus and method for non-metallic materials. It offers the following advantages:

[0041] 1. This invention employs two sliding pressure plates that maintain an angle of sliding and a suspension frame that restricts the downward sliding of the sliding pressure plates by obstructing the metal strip. The double-headed screw can be adjusted to a position that obstructs the downward movement of the metal strip. When the telescopic component drives the support assembly to move downward, the two sets of sliding pressure plates will not collide with the L-shaped support system downward. That is, there is no sliding contact between the two. During the loading experiment, there will be no direct force between the two sets of sliding pressure plates and the L-shaped support system, ensuring that the pressure measured by the pressure sensor is transmitted through the test specimen (a test specimen with a square cross-section), thereby ensuring the accuracy of data acquisition and improving the reliability of the test experiment.

[0042] 2. This invention employs two sliding pressure plates that maintain an angle of sliding and a suspension frame that restricts the downward sliding of the sliding pressure plates by obstructing the metal strip. When the double-headed screw is adjusted to the position that obstructs the downward movement of the metal strip, and the telescopic component drives the support assembly to move downward, the two sets of sliding pressure plates press the test sample (a test sample with a square cross-section) inward. Compared with the simple sliding between two interlocking L-shaped clamps in the traditional method, the relative sliding between the two sets of sliding pressure plates and the test sample is reduced, and the applied force is perpendicular to the side direction of the test sample, ensuring the accuracy of the experimental data. Attached Figure Description

[0043] Figure 1 This is a perspective view of a bidirectional compression mechanics testing device for non-metallic materials proposed in this invention;

[0044] Figure 2 This is a front view of a bidirectional compression mechanics testing apparatus for non-metallic materials proposed in this invention;

[0045] Figure 3 This is a side view of a bidirectional compression mechanics testing device for non-metallic materials proposed in this invention;

[0046] Figure 4 for Figure 2 Cross-sectional view of section line AA in the middle;

[0047] Figure 5 for Figure 3 A sectional view of the section line at point BB;

[0048] Figure 6 This is a three-dimensional schematic diagram of the compression component of a bidirectional compression mechanics testing device for non-metallic materials proposed in this invention;

[0049] Figure 7 This is a three-dimensional schematic diagram of the indenter structure of a bidirectional compression mechanics testing device for non-metallic materials proposed in this invention;

[0050] Figure 8 This is an exploded view of the support base of a bidirectional compression mechanics testing device for non-metallic materials proposed in this invention;

[0051] Figure 9 This is a schematic diagram of the connecting shaft of a bidirectional compression mechanics testing device for non-metallic materials proposed in this invention;

[0052] Figure 10 This is a cross-sectional schematic diagram of the connecting shaft of a bidirectional compression mechanics testing device for non-metallic materials proposed in this invention.

[0053] The components include: 1. Main frame; 101. U-shaped frame; 102. Bottom support system; 103. Top frame; 2. Data acquisition module; 3. Support base; 301. Chassis; 302. Threaded seat; 303. Connecting shaft; 3031. Top shaft section; 3032. Bottom shaft section; 3033. Hexagonal part; 3034. First slide groove; 3035. Receiving groove; 3036. Restricting slider; 3037. Elastic plate; 3038. Positioning hole; 3039. Side opening; 30310. Bottom hole; 30311. Long screw; 30312. Short shaft; 304. Support bracket; 3041. L-shaped support system; 3042. Sleeve; 3043. 305. Sliding block; 4. Pressure sensor; 5. Downward pressing assembly; 401. Telescopic component; 401a. Flange; 402. Displacement sensor; 403. Upper support frame; 4031. Cylindrical part; 4032. Locking nut; 4033. Frame body; 40331. Horizontal part; 40332. First bend; 40333. Second bend; 40334. Reinforcing member; 404. Sliding pressure plate; 405. Inner support frame; 406. Metal strip; 4061. Multi-layer long strip; 4062. Compacting part; 4063. T-shaped connector; 5. Suspension frame; 501. Side frame; 502. Double-ended screw; 503. Sliding hole; 504. Nut assembly. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0055] In one embodiment, the bidirectional compression mechanical testing device of the present invention belongs to the category of new material testing tools and is used to conduct bidirectional compression mechanical tests on newly developed non-metallic materials; please refer to Figures 1-10 Specifically, a bidirectional compression mechanics testing device for non-metallic materials is provided, which includes: a main frame 1, a support base 3, a pressing component 4, a suspension frame 5, and a data acquisition module 2.

[0056] The main frame 1 adopts a frame-shaped or U-shaped structure, and it provides at least one bottom plate, one top plate, and side plates for fixing the bottom plate and the top plate. The bottom plate is used to install the support base 3, and the top plate is used to install the pressure assembly 4 and the suspension bracket 5. Generally, the data acquisition module 2 is installed on the side plate.

[0057] Please refer to Figure 5 The main frame 1 includes a U-shaped frame 101, a bottom support system 102, and a top frame 103. The bottom support system 102 is fixedly installed on both sides of the bottom of the U-shaped frame 101 to stabilize and support the U-shaped frame 101. The top frame 103 is fixedly installed on the top of the U-shaped frame 101, presenting a U-shaped structure.

[0058] Please refer to Figure 8 The support base 3 includes: a support column fixedly connected to the base plate of the main frame 1, a support bracket 304 slidably sleeved on the top of the support column, and a pressure sensor 305 installed between the bottom of the support bracket 304 and the top of the support column. The support bracket 304 can slide up and down. When the support bracket 304 slides down, it applies pressure to the pressure sensor 305. The pressure sensor 305 is used to monitor the downward pressure applied by the support bracket 304 in real time. An L-shaped support system 3041 is provided on the top of the support bracket 304, and the axis of the support column is located in the plane of symmetry of the L-shaped support system 3041. The corner of the L-shaped support system 3041 corresponds to the top of the support column.

[0059] like Figure 2 As shown, the pressing component 4 is positioned above the support base 3; please refer to... Figure 5The pressing component 4 includes: a telescopic member 401, a displacement sensor 402, a support assembly, a sliding pressure plate 404, and a metal strip 406. The telescopic member 401 is fixedly connected to the top plate of the main frame 1. The displacement sensor 402 is installed on the fixed part of the telescopic member 401 and is used to measure the telescopic amount of the telescopic member 401. The displacement sensor 402 can be an optical sensor. The support assembly is fixedly installed on the bottom telescopic end of the telescopic member 401. The telescopic member 401 drives the support assembly to slide up and down. The sliding pressure plate 404 is slidably installed on the inner side of the support assembly, and two sets of sliding pressure plates 404 are symmetrically arranged. The tops of the two sets of sliding pressure plates 404 are connected by a metal strip 406. The symmetry plane of the two sets of sliding pressure plates 404 coincides with the symmetry plane of the L-shaped support system 3041. The included angle between the two sets of sliding pressure plates 404 is 90°. The sliding pressure plate 404 can slide along the horizontal plane at a 45° angle. During the sliding process of the sliding pressure plate 404 relative to the support assembly, the included angle between the two sets of sliding pressure plates 404 remains unchanged.

[0060] The suspension bracket 5 is fixedly installed on the main frame 1, and the suspension bracket 5 has an adjustable double-headed screw 502 located below the metal strip 406. The double-headed screw 502 can slide up and down to adjust its position, and after adjustment, it can be fixed to the suspension bracket 5. The data acquisition module 2 is used to acquire experimental data from the pressure sensor 305 and the displacement sensor 402.

[0061] In this application, the double-ended screw 502 can be adjusted to a position that hinders the downward movement of the metal strip 406. When the telescopic member 401 drives the support assembly to move downward, the outer sides of the two sets of sliding pressure plates 404 are subjected to force. The two sets of sliding pressure plates 404 will not collide downward with the L-shaped support system 3041, and there is no sliding contact between them. During the loading experiment, there will be no direct force between the two sets of sliding pressure plates 404 and the L-shaped support system 3041, ensuring that the pressure measured by the pressure sensor 305 is transmitted through the test specimen (a test specimen with a square cross-section). As is well known, the force on both sides of a test specimen with a square cross-section is the same, and the vertical force on both sides is... =Pressure measured by pressure sensor 305.

[0062] In this application, the double-headed screw 502 can be adjusted to a position that prevents the metal strip 406 from moving downward. When the telescopic member 401 drives the support assembly to move downward, the outer sides of the two sets of sliding pressure plates 404 are subjected to force, causing the two sets of sliding pressure plates 404 to press the test sample (a test sample with a square cross-section) towards the inside. Compared with the simple sliding between the two interlocking L-shaped clamps in the traditional method, the relative sliding between the two sets of sliding pressure plates 404 and the test sample is reduced, and the applied force is perpendicular to the side of the test sample, ensuring the accuracy of the experimental data.

[0063] In use, a test sample with a square cross-section is placed in the L-shaped support system 3041 of the support base 3. Then, the telescopic component 401 of the pressing component 4 is controlled to move downward. The telescopic component 401 pushes the support component, sliding pressure plate 404, and metal strip 406 downward. When the sliding pressure plate 404 contacts the test sample, the height position of the double-headed screw 502 of the suspension frame 5 is adjusted so that the double-headed screw 502 can tension the metal strip 406 upward. Then, the double-headed screw 502 is fixed, and the telescopic component 401 of the pressing component 4 is controlled to move downward. The telescopic component 401 pushes the support component, sliding pressure plate 404, and metal strip 406 downward. At this time, the metal strip 406 cannot move downward because it is restricted by the double-headed screw 502, and the sliding pressure plate 404 cannot move downward. When the support component pushes the sliding pressure plate 404 downward, the sliding pressure plate 404 squeezes the test sample inward. The stress-strain curve is generated based on the data obtained by the data acquisition module 2.

[0064] In one embodiment, the support column includes: a base 301, a threaded seat 302, and a connecting shaft 303.

[0065] The chassis 301 is fixedly installed on the base plate of the U-shaped frame 101. The chassis 301 and the base plate of the U-shaped frame 101 can be fixed by welding. A threaded seat 302 is fixedly installed on the flange of the chassis 301. The threaded seat 302 has a threaded connection port with the opening facing upward. The bottom end of the connecting shaft 303 is fixedly installed on the threaded seat 302.

[0066] The support bracket 304 includes: a sleeve 3042, the top end of the sleeve 3042 is closed, and an L-shaped support system 3041 is fixedly installed on the top end of the sleeve 3042. The sleeve 3042 is sleeved on the top end of the connecting shaft 303. The sleeve 3042 can slide up and down relative to the connecting shaft 303. A pressure sensor 305 is disposed inside the sleeve 3042. The pressure sensor 305 is located at the top end of the connecting shaft 303. When the sleeve 3042 is subjected to up and down force, it can transmit the pressure to the compression pressure sensor 305.

[0067] In one embodiment, the connecting shaft 303 includes: an integrally formed top shaft segment 3031 and a bottom shaft segment 3032. A hexagonal portion 3033 is fixedly provided at the junction of the top shaft segment 3031 and the bottom shaft segment 3032. The bottom shaft segment 3032 is threadedly engaged with the threaded seat 302. Based on the design of the hexagonal portion 3033, the bottom shaft segment 3032 can be easily rotated with a wrench.

[0068] A first groove 3034 communicating with the top end of the top shaft segment 3031 is provided on the side of the top shaft segment 3031. A receiving groove 3035 is provided on the side of the top shaft segment 3031, and the receiving groove 3035 communicates with the side of the first groove 3034. A limiting slider 3036 is slidably disposed on the inner side of the first groove 3034, and the side of the limiting slider 3036 corresponds to the side of the receiving groove 3035. A side opening 3039 is provided on the side of the first groove 3034 and below the receiving groove 3035. The inner side of the limiting slider 3036 and located at the side opening 3039... An elastic plate 3037 is fixedly connected inside the sleeve 39. A positioning hole 3038 is provided at the end of the elastic plate 3037 away from the limiting slider 3036. A bottom hole 30310 is provided at the bottom end of the bottom shaft section 3032. The top end of the bottom hole 30310 communicates with the side opening 3039. A long screw 30311 is installed in the internal thread of the bottom hole 30310. A short shaft 30312 corresponding to the positioning hole 3038 is fixedly connected to the top end of the long screw 30311. A sliding block 3043 with a length shorter than the length of the receiving groove 3035 is fixedly connected to the inner side of the sleeve 3042.

[0069] When installing sleeve 3042, the user aligns sliding block 3043 with the first groove 3034, presses sleeve 3042 downward, and slides sliding block 3043 downward inside the first groove 3034. When the bottom end of sliding block 3043 abuts against the top of limiting slider 3036, the user continues to apply downward force to sleeve 3042, causing limiting slider 3036 to push elastic plate 3037 downward and deform, allowing limiting slider 3036 to slide downward. At this time, sliding block 3043 of sleeve 3042 slides further within the first groove 3034. Then, sleeve 3042 is rotated, causing sliding block 3043 of sleeve 3042 to enter receiving groove 3035. Limiting slider 3036 returns to its original position under the restoring force of elastic plate 3037. At this point, sliding block 3043 of sleeve 3042 can no longer rotate, achieving a stable connection between connecting shaft 303 and sleeve 3042.

[0070] In one embodiment, a flange 401a is provided on the side of the telescopic member 401. The flange 401a is located below the top frame 103, and the flange of the telescopic member 401 is fixedly installed to the top frame 103 by multiple sets of bolts. During the experiment, the reaction force of the telescopic member 401 causes the fixed part of the telescopic member 401 to bear an upward reaction force. The installation method in which the flange 401a is located below the top frame 103 can ensure the stable installation of the telescopic member 401 and the top frame 103.

[0071] In one embodiment, the support assembly includes an upper support 403 and an inner support 405.

[0072] The upper support frame 403 is fixedly installed at the bottom telescopic end of the telescopic component 401, and the inner support frame 405 is fixedly installed at the inner top of the upper support frame 403. The sliding pressure plate 404 is slidably engaged with the upper support frame 403 and the inner support frame 405 through a T-shaped structure. The two-part sliding connection method (upper support frame 403 and inner support frame 405) can improve the sliding stability of the sliding pressure plate 404.

[0073] The upper support frame 403 includes: a cylindrical part 4031, a locking nut 4032, and a frame body 4033.

[0074] The cylindrical part 4031 is threadedly connected to the telescopic rod of the telescopic member 401. Based on this threaded connection structure, the height of the upper support 403 can be adjusted. A locking nut 4032 is threadedly installed on the telescopic rod of the telescopic member 401 above the cylindrical part 4031. The locking nut 4032 rotates in the opposite direction, so that it presses against the top of the cylindrical part 4031, forming a lock on the threaded connection between the cylindrical part 4031 and the telescopic rod of the telescopic member 401. The frame body 4033 is fixedly installed at the bottom of the cylindrical part 4031.

[0075] Specifically, the frame 4033 includes a horizontal part 40331, and both sides of the horizontal part 40331 are fixedly connected to a first bent part 40332 extending downward and outward. The sides of the first bent part 40332 are fixedly connected to a second bent part 40333 extending downward and inward.

[0076] The horizontal part 40331, the first bent part 40332, and the second bent part 40333 are all integral structures, manufactured by bending process. A reinforcing member 40334 is fixedly provided between the second bent part 40333 and the first bent part 40332 to increase the stability between the two parts and prevent deformation under stress. The sliding pressure plate 404 slides with the bottom end of the second bent part 40333, preferably adopting a T-type sliding fit design.

[0077] In one embodiment, the metal strip 406 includes: a multi-layer long strip 4061, the two ends of the multi-layer long strip 4061 are formed into compacted parts 4062 by welding and compaction process, and the two ends of the multi-layer long strip 4061 are fixedly installed to the top ends of two sliding pressure plates 404 by screws through T-shaped connectors 4063.

[0078] Multi-layer long strip 4061 has a certain degree of flexibility to meet the deformation requirements of metal strip 406, and multi-layer long strip 4061 is strong enough to enable it to be used for a long time.

[0079] In one embodiment, the suspension bracket 5 includes: a side bracket 501, a double-ended screw 502, and a nut assembly 504.

[0080] The top of the side frame 501 is fixedly installed with the top frame 103. The side of the side frame 501 has a sliding hole 503. The double-ended screw 502 slides inside the sliding hole 503 and is fixedly connected to the side frame 501 through a nut assembly 504. The nut assembly 504 consists of two nuts located on both sides of the side frame 501, which clamp the side frame 501 to fix the side frame 501 and the double-ended screw 502.

[0081] To ensure the stability of the double-ended screw 502 under stress, two sets of side frames 501 are symmetrically arranged. Example

[0082] This embodiment provides a biaxial compression mechanical testing method for non-metallic materials, using the biaxial compression mechanical testing apparatus for non-metallic materials from Embodiment 1, and specifically includes the following steps:

[0083] S1. Place the test sample with a square cross-section inside the L-shaped support system 3041 of the support base 3.

[0084] S2. Control the telescopic component 401 of the pressing component 4 to move downward. The telescopic component 401 pushes the support component, sliding pressure plate 404 and metal strip 406 downward. When the sliding pressure plate 404 contacts the test sample, slide and adjust the height position of the double-headed screw 502 of the suspension bracket 5 so that the double-headed screw 502 can tension the metal strip 406 upward. Then fix the double-headed screw 502.

[0085] S3. Continue controlling the movement of the telescopic component 401 of the pressing assembly 4. The telescopic component 401 pushes the support assembly, sliding pressure plate 404, and metal strip 406 downwards. At this time, the metal strip 406 cannot move downwards due to the restriction of the double-headed screw 502, and the sliding pressure plate 404 cannot move downwards. When the support assembly pushes the sliding pressure plate 404 downwards, the sliding pressure plate 404 presses the test sample inwards. Based on the data obtained by the data acquisition module 2, a stress-strain curve is generated. It is worth noting that, as is well known, the force on both sides of a test sample with a square cross-section is the same, and the vertical force on both sides of the test sample is... =The pressure measured by pressure sensor 305 can be used to calculate the stress in the vertical direction on both sides.

[0086] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bidirectional compression mechanics testing apparatus for non-metallic materials, comprising: The main frame (1) is in the shape of a frame / return shape; Its characteristic is that it further includes: The support base (3) includes: a support column fixedly connected to the bottom plate of the main frame (1), a support bracket (304) slidably sleeved on the top of the support column, and a pressure sensor (305) installed between the bottom of the support bracket (304) and the top of the support column. The top of the support bracket (304) is provided with an L-shaped support system (3041), and the axis of the support column is located in the symmetry plane of the L-shaped support system (3041). The pressing component (4) is located above the support base (3). The pressing component (4) includes: a telescopic component (401), a displacement sensor (402), a support assembly, a sliding pressure plate (404), and a metal strip (406). The telescopic component (401) is fixedly connected to the top plate of the main frame (1). The displacement sensor (402) is installed on the fixed part of the telescopic component (401) and is used to measure the telescopic amount of the telescopic component (401). The support assembly is fixedly installed at the bottom telescopic end of the telescopic component (401). The sliding pressure plate (404) is slidably installed on the inner side of the support assembly. Two sets of sliding pressure plates (404) are symmetrically arranged. The tops of the two sets of sliding pressure plates (404) are connected by a metal strip (406). The symmetrical plane of the two sets of sliding pressure plates (404) coincides with the symmetrical plane of the L-shaped support system (3041). The suspension bracket (5) is fixedly installed on the main frame (1) and has an adjustable double-headed screw (502) located below the metal strip (406). The data acquisition module (2) is used to acquire experimental data from the pressure sensor (305) and the displacement sensor (402); The metal strip (406) includes: a multi-layer long strip (4061), the two ends of which are fixedly installed to the top ends of two sliding pressure plates (404) by screws through T-shaped connectors (4063), and the multi-layer long strip (4061) is flexible.

2. The biaxial compression mechanical testing device for non-metallic materials according to claim 1, characterized in that, The main framework (1) includes: A U-shaped frame (101) is provided, with bottom support systems (102) fixedly installed on both sides of the bottom of the U-shaped frame (101). Top frame (103), which is fixedly installed on the top of U-shaped frame (101).

3. The biaxial compression mechanical testing device for non-metallic materials according to claim 2, characterized in that: The support column includes: The chassis (301) is fixedly installed on the base plate of the U-shaped frame (101), and a threaded seat (302) is fixedly installed on the flange of the chassis (301). A connecting shaft (303) is fixedly mounted on a threaded seat (302) at its bottom end; The support bracket (304) includes: a sleeve (3042), the top end of the sleeve (3042) is closed, and an L-shaped support system (3041) is fixedly installed on the top end of the sleeve (3042); The sleeve (3042) is fitted onto the top end of the connecting shaft (303).

4. The biaxial compression mechanical testing device for non-metallic materials according to claim 3, characterized in that: The telescopic component (401) has a flange (401a) on its side. The flange (401a) is located below the top frame (103), and the flange of the telescopic component (401) is fixedly installed to the top frame (103) by multiple sets of bolts.

5. The biaxial compression mechanical testing device for non-metallic materials according to claim 1, characterized in that, The support assembly includes: The upper support (403) is fixedly installed with the bottom telescopic end of the telescopic member (401); An inner support frame (405) is fixedly installed on the inner top of the upper support frame (403); The sliding pressure plate (404) is slidably engaged with the upper support frame (403) and the inner support frame (405) through a T-shaped structure; The upper support (403) includes: The cylindrical part (4031) is threadedly connected to the telescopic rod of the telescopic member (401), and a locking nut (4032) is threadedly installed on the telescopic rod of the telescopic member (401) above the cylindrical part (4031). The frame (4033) is fixedly installed at the bottom of the cylindrical part (4031).

6. The biaxial compression mechanical testing device for non-metallic materials according to claim 5, characterized in that: The frame (4033) includes a horizontal part (40331), and a first bending part (40332) extending downward and outward is fixedly connected to both sides of the horizontal part (40331). A second bending part (40333) extending downward and inward is fixedly connected to the side of the first bending part (40332). A reinforcing member (40334) is fixedly provided between the second bending part (40333) and the first bending part (40332). The sliding pressure plate (404) slides in conjunction with the bottom end of the second bending part (40333).

7. The biaxial compression mechanical testing device for non-metallic materials according to claim 1, characterized in that: The two ends of the multi-layer long strip (4061) are formed into compacted parts (4062) by welding and compaction process.

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