Device for testing the residual strength of a composite material after damage

Abstract

The application belongs to the field of new material testing equipment, and the composite material damage residual strength testing device has a base assembly with a bottom plate, a clamping assembly arranged above the bottom plate, and a bottom of a sample to be tested clamped on the clamping assembly; a side support assembly is installed above the bottom plate and has at least two split side support plate assemblies, the sample to be tested is installed between the two split side support plate assemblies and clamped; an anti-instability assembly is installed opposite to the outside of the two side support plate assemblies and located between the two side support plate assemblies, and the two ends are connected with the two side support plate assemblies, respectively, the sample to be tested is arranged in an area enclosed by the anti-instability assembly and the side support plate assembly to prevent the sample to be tested from buckling during compression; and an upper pressing plate assembly is installed above the side support assembly to position and clamp the end surface of the sample to be tested. The device is convenient to install and operate and has a wide range of applications.

Description

Technical Field

[0001] This utility model relates to the field of new material testing equipment, specifically to a large-size composite material damage residual strength testing device. Background Technology

[0002] Composite materials inevitably suffer from low-energy impacts during service and maintenance, such as hail impacts, runway debris, and tool drops. Unlike high-energy impacts, which cause visible damage, low-energy impacts damage the brittle matrix material, often manifesting as internal delamination. These damages are difficult to detect during routine inspections but significantly reduce the structure's load-bearing capacity. Therefore, research on the low-energy impact damage characteristics of composite laminates is crucial for ensuring their service safety.

[0003] The commonly used test method for testing impact damage of composite materials is ASTM D7136. Rectangular composite plates are subjected to concentrated out-of-plane impact using a drop hammer device with a hemispherical impactor. After impact, the specimen needs to be subjected to a compression test to obtain the residual strength after damage. The test standard of ASTM D7137 is generally adopted.

[0004] The specimens fixed according to ASTM D7137 standard are as follows: Figure 15 As shown, the dimensions are 150×100, and the compression clamp type recommended by ASTM D7137 standard is as follows. Figure 16 As shown, the impact location is at the center of the specimen's plane. The existing standard tests are applicable to specimens with smaller dimensions. For larger specimens, the load is high, and buckling is likely to occur. Utility Model Content

[0005] The purpose of this invention is to overcome at least one defect of the prior art and provide a composite material damage residual strength testing device to solve the problem of testing large-size composite materials.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A composite material damage residual strength testing device shall have at least the following features:

[0008] The base assembly is the support part of the testing device and has a base plate. A clamping assembly is provided on the base plate. The bottom of the sample to be tested is clamped on the clamping assembly. The testing device is set on the testing platform of the testing machine through the base assembly.

[0009] A side support assembly is installed above the base plate and has at least two separately configured side support plate assemblies. The test sample is installed between the two separately configured side support plate assemblies and is clamped therebetween.

[0010] An anti-buckling component is installed opposite to the two side support plate components on the outside and between the two side support plate components. Its two ends are respectively connected to the two side support plate components. The test sample is placed in the area enclosed by the anti-buckling component and the side support plate components to prevent the test sample from buckling during compression.

[0011] The upper pressure plate assembly is installed above the side support assembly to position and clamp the end face of the sample to be tested.

[0012] As a preferred embodiment, the clamping assembly has at least opposing support plates, and opposing clamping slide plates are disposed between the opposing support plates. The test sample is clamped between the opposing clamping slide plates, and each clamping slide plate is connected to its adjacent support plate by an adjusting screw. The spacing between the clamping slide plates is adjusted by the adjusting screw to achieve clamping of the test sample.

[0013] In a further preferred embodiment, the clamping slide plate is provided with a first sliding groove, and the base plate is provided with a first guide post. The first guide post is disposed in the first sliding groove, so that the first sliding groove and the first guide post form relative sliding and sliding limit, thereby achieving more effective clamping of the sample to be tested.

[0014] In a further preferred embodiment, a pad is also provided between the base plate and the clamping slide plate.

[0015] As a preferred embodiment, guide blocks are provided on both sides of the support plate on the base plate. The guide blocks are located on the outside of the side support assembly and limit the side support assembly.

[0016] In a further preferred embodiment, baffles are provided at both ends of the base plate, and adjusting screws are provided on the baffles. The adjusting screws abut against the side support assembly. By adjusting the adjusting screws, the side support assembly moves relative to the base plate, thereby achieving more effective clamping of the test sample.

[0017] As a preferred embodiment, each of the side support plate assemblies of the side support assembly has at least a side support plate and a support seat. The side support plate and the support seat are arranged in an L-shape. The support seat is disposed on the base plate and is fixedly connected to the bottom of the side support plate on one side. The side support plate has a U-shaped structure, and the opening of the U-shaped structure faces the clamping direction of the sample to be tested.

[0018] In a further preferred embodiment, the support base is disposed inside the guide block, and a second sliding groove is provided thereon. A second guide post is disposed in the second sliding groove, and the bottom end of the second guide post is disposed on the base plate. The second sliding groove and the second guide post can generate relative sliding and limiting, thereby realizing relative sliding and limiting of the support base and the side support plate connected to the support base.

[0019] In a further preferred embodiment, each of the side support plate assemblies of the side support assembly also has a side sliding plate, which is disposed at the U-shaped structure of the side support plate, and two side sliding plates are disposed at the U-shaped structure of each side support plate. The test sample is clamped between the two side sliding plates, and the side sliding plate is connected to the side support plate by adjusting screws. The relative sliding of the side sliding plates is achieved by adjusting screws, thereby achieving the clamping of the test sample.

[0020] In a further preferred embodiment, each of the side support plate components of the side support assembly also has a reinforcing rib. The reinforcing rib is a corner plate structure with at least two right-angled sides and one inclined side. The two right-angled sides abut against the two mutually perpendicular surfaces of the L-shaped structure formed by the side support plate and the support seat, respectively. Combined with the inclined side, the side support plate assembly as a whole has a triangular structure, which increases the stability of the side support plate assembly.

[0021] As a preferred embodiment, the anti-instability component has at least an upper plate and a lower plate arranged on the same plane, the upper plate and the lower plate are connected to the side support plate assembly, and there is a gap between the upper plate and the lower plate for observing the test process; a support strip is connected to the same side of the upper plate and the lower plate, the support strip is arranged perpendicular to the upper plate and the lower plate, and the support strip is arranged facing the side of the test sample, with one end abutting against the test sample.

[0022] In a further preferred embodiment, the upper and lower plates are provided with U-shaped grooves to adjust the position of the support bar in the horizontal direction.

[0023] In a further preferred embodiment, at least three support bars are provided, which are arranged in parallel with each other, and the outer support bars are provided with notches to avoid the fracture location of the test sample.

[0024] As a preferred embodiment, the upper pressure plate assembly has at least a top plate, the top plate having a U-shaped structure with the opening facing downwards, and two top sliding plates disposed within the U-shaped structure. Each top sliding plate has an adjusting screw on its outer side, and the top sliding plates slide relative to each other via the adjusting screws. The test sample is clamped in the inner portion of the two top sliding plates that are positioned opposite each other.

[0025] In a further preferred embodiment, an upper pressure plate is provided on the inner side of the upper pressure plate assembly, the upper pressure plate is located between the inner side of the top plate and the top sliding plate, and scale lines are provided on its outer side to position the sample; a handle is also provided on the outer side of the upper pressure plate assembly for easy disassembly.

[0026] The above-mentioned composite material damage residual strength testing device has the following beneficial effects:

[0027] (1) This technical solution uses a base assembly, a side support assembly, an anti-instability assembly, and an upper pressure plate assembly to surround and clamp the test sample, effectively ensuring the stability of the test;

[0028] (2) This technical solution ensures the stability of the installation and clamping of the side support plate assembly by setting the guide block of the base assembly and the reinforcing rib of the side support plate assembly, and improves the rigidity of the overall clamping structure.

[0029] (3) This technical solution sets up an anti-instability component to ensure that buckling does not occur during compression, and also sets up an observation area between the upper and lower plates to observe the test process in real time.

[0030] (4) Each structural component of this technical solution is equipped with an adjustable structure, which can effectively realize the testing of specimens of various sizes, especially large-sized specimens. It is also easy to install, convenient to operate, and has a wide range of applications. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the composite material damage residual strength testing device according to an embodiment of the present invention;

[0032] Figure 2 yes Figure 1 Exploded view;

[0033] Figure 3 yes Figure 1 A screenshot illustration from one perspective;

[0034] Figures 4-5 This is a schematic diagram of the structure of the base assembly according to an embodiment of the present utility model;

[0035] Figures 6-8 This is a structural schematic diagram of the side support plate assembly according to an embodiment of the present utility model;

[0036] Figures 9-10 This is a schematic diagram of the anti-instability component according to an embodiment of the present invention;

[0037] Figures 11-13 This is a schematic diagram of the upper pressure plate assembly according to an embodiment of the present invention;

[0038] Figure 14 This is a schematic diagram of a large-size test sample according to an embodiment of this utility model;

[0039] Figure 15 This is a schematic diagram of an existing test sample in the background technology;

[0040] Figure 16 This is a schematic diagram of an existing compression fixture in the background art;

[0041] In the picture:

[0042] 1-Testing apparatus;

[0043] 10-Base assembly; 100-Base plate; 101-Clamping assembly; 1010-Support plate; 1011-Clamping slide plate; 10110-First slide groove; 10111-First guide post; 102-Pad plate; 103-Guide block; 104-Baffle plate;

[0044] 11-Side support assembly; 110-Side support plate assembly; 1100-Side support plate; 11000-Side edge; 11001-Pin hole; 1101-Support base; 11010-Second slide groove; 11011-Second guide post; 1102-Side slide plate; 11020-End; 1103-Reinforcing rib; 11030-Right angle edge; 11031-Inclined edge;

[0045] 12-Anti-instability component; 120-Upper plate; 1200-U-shaped groove; 121-Lower plate; 122-Support bar; 1220-Notch; 123-Horizontal support plate;

[0046] 13-Upper pressure plate assembly; 130-Top plate; 131-Top slide plate; 132-Upper pressure plate; 1320-Scale line; 133-Handle;

[0047] 14 - Adjusting screw;

[0048] 2-Sample to be tested. Detailed Implementation

[0049] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0050] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of description and simplification of operation. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0053] The following is in conjunction with the appendix Figures 1-15 The present invention provides a detailed description of the composite material damage residual strength testing device.

[0054] like Figures 1-3 As shown, the composite material damage residual strength testing device 1 of this utility model has at least the following features:

[0055] The base assembly 10 is the support part of the testing device 1. It has a base plate 100 and a clamping assembly 101 is provided above the base plate 100. The bottom of the test sample 2 is clamped on the clamping assembly 101. The testing device 1 is set on the testing platform of the testing machine through the base assembly 10.

[0056] The side support assembly 11 is installed above the base plate 100 and has at least two separate side support plate assemblies 110. The test sample 2 is installed between the two separate side support plate assemblies 110 and is clamped.

[0057] The anti-buckling component 12 is installed opposite to the outside of the two side support plate components 110 and is located between the two side support plate components 110. Its two ends are respectively connected to the two side support plate components 110. The test sample 2 is placed in the area enclosed by the anti-buckling component 12 and the side support plate components 110 to prevent the test sample 2 from buckling during compression.

[0058] The upper pressure plate assembly 13 is installed above the side support assembly 11 to position and clamp the end face of the test sample 2.

[0059] Based on the above scheme, a more detailed explanation of this scheme is as follows.

[0060] It should be noted that the solution shown in this embodiment is applicable to test samples 2 of various sizes, except... Figure 15 In addition to the sample size shown in the background art, a large-sized irregularly shaped test sample 2 with dimensions of 1000×400 and arc notches of radius 100mm and arc degree Π on both sides of the middle of the test sample 2 can also be used, such as... Figure 14 shown.

[0061] In this embodiment, combined with Figures 4-5 As shown, the base plate 100 of the base assembly 10 adopts a rectangular flat plate structure, matching the test platform of the testing machine (not shown in the attached figure). A clamping assembly 101 is provided above the base plate 100. The clamping assembly 101 has at least two opposing support plates 1010. Each support plate 1010 is fixed to the outer side of the base plate 100 in the length direction by screws. The height of the support plate 1010 is greater than the thickness of the base plate 100. Two opposing clamping slide plates 1011 are provided between the two opposing support plates 1010. Each clamping slide plate 1011 is connected to its adjacent support plate 1010 by adjusting screws 14. The test sample 2 is clamped between the opposing clamping slide plates 1011. The distance between the two clamping slide plates 1011 is adjusted by adjusting screws 14 to achieve clamping of the test sample 2.

[0062] The clamping slide plate 1011 is provided with a first slide groove 10110 extending along the width direction of the base plate 100. The base plate 100 is provided with a first guide post 10111, which is vertically inserted into the first slide groove 10110. By adjusting the adjusting screw 14, the first slide groove 10110 and the first guide post 10111 are made to slide and slide limit relative to the width direction of the base plate 100, thereby achieving more effective clamping of test samples 2 of different thicknesses.

[0063] A pad 102 is provided above the base plate 100 and between the clamping slide plate 1011. The bottom of the test sample 2 is placed against the pad 102 and clamped by the two clamping slide plates 1011.

[0064] Guide blocks 103 are provided on both sides of the support plate 1010 on the base plate 100. The guide blocks 103 are long strip-shaped structures that extend along the length of the base plate 100. In the width direction of the base plate 100, the guide blocks 103 are located outside the side support assembly 11 and provide upper limit positioning for the side support assembly 11 in the span direction of the base plate 100.

[0065] A baffle 104 is provided at both ends of the base plate 100 along its length. The baffle 104 is fixed to the two sides of the base plate 100 by screws. An adjusting screw 14 is provided on the baffle 104. The adjusting screw 14 abuts against the side support assembly 11. By adjusting the adjusting screw 14, the side support assembly 11 moves relative to the base plate 100 along its length, thereby achieving more effective clamping of test samples 2 of different widths.

[0066] In this embodiment, combined with Figures 6-8 As shown, each side support plate assembly 110 of the side support assembly 11 has at least a side support plate 11001100 and a support base 1101. The side support plate 11001100 and the support base 1101 are arranged in an L-shape. The support base 1101 is horizontally arranged on the base plate 100 and is located between two guide blocks 103 on the same side. A second sliding groove 11010 is provided on the support base 11010 along the length direction of the base plate 100. A second guide post 11011 is provided in the second sliding groove 11010. The bottom end of the second guide post 11011 is provided on the base plate 100, and the upper end passes through the second sliding groove 11010. Relative sliding and limiting can occur between the second guide post 11010 and the second sliding groove 11010 along the length direction of the base plate 100, thereby realizing relative sliding and limiting of the support base 1101.

[0067] The side support plate 11001100 is set vertically, and the bottom of the side support plate 11001100 is fixedly connected to one side of the support base 1101. Its vertical side has a U-shaped structure, and the opening of the U-shaped structure faces the clamping direction of the test sample 2. Two side slide plates 1102 are set at the U-shaped structure of each side support plate assembly 110. The side slide plates 1102 extend along the height direction of the side support plate 11001100. The two side slide plates 1102 clamp the side edge 11000 of the test sample 2 in the width direction. Each side slide plate 1102 is connected to the side edge 11000 of the U-shaped structure of the adjacent side support plate 11001100 by adjusting screws 14. The relative sliding of the side slide plates 1102 is achieved by adjusting screws 14, thereby achieving the clamping of the edge of the test sample 2 in the width direction.

[0068] In this embodiment, an adjusting screw 14 is connected to the side of the side plate 1102 adjacent to the side support plate 11001100U-shaped structure side 11000. The end 11020 opposite to the adjusting screw 14 abuts against the test sample 2. The end 11020 is set as a wedge-shaped arc end 11020 structure. Other structures, such as semi-circular or square, can also be used in other embodiments. The end 11020 structure can be set according to actual needs. This solution does not limit it.

[0069] In this embodiment, each side support plate assembly 110 of the side support assembly 11 also has a reinforcing rib 1103. The reinforcing rib 1103 is a corner plate structure. The corner plate structure has at least two right-angled sides 11030 and one inclined side 11031. The two right-angled sides 11030 abut against the two mutually perpendicular sides of the L-shaped structure formed by the side support plate 11001100 and the support base 1101, respectively. Combined with the inclined side 11031, the side support plate assembly 110 has a triangular structure as a whole, which increases the stability of the side support plate assembly 110.

[0070] In this embodiment, a pin hole 11001 is also provided on the outer side of the U-shaped structure of the side support plate 11001100. The pin hole 11001 cooperates with the anti-instability component 12 to realize the installation of the anti-instability component 12.

[0071] In this embodiment, combined with Figures 9-10 As shown, the anti-instability component 12 has at least an upper plate 120 and a lower plate 121 arranged on the same plane, with a gap between the upper plate 120 and the lower plate 121 for observing the test process; tightening bolts are provided on the upper plate 120 and the lower plate 121, which cooperate with pin holes 11001 provided on the outer side of the side support plate 11001100, so that the upper plate 120 and the lower plate 121 can be installed on the outer side of the side support plate 11001100. Support bars 122 are connected to the same side of the upper plate 120 and the lower plate 121. U-shaped grooves 1200 are also provided on the upper plate 120 and the lower plate 121 to adjust the position of the support bar 122 in the horizontal direction; the support bar 122 is set perpendicular to the upper plate 120 and the lower plate 121, and the support bar 122 is set towards the side of the test sample 2, with one end of the support bar 122 abutting against the test sample 2; at least three support bars 122 are set in the vertical direction, and the multiple support bars 122 are set in parallel, and the support bar 122 on the outer side is provided with a notch 1220 to avoid the fracture position of the test sample 2.

[0072] In this embodiment, in order to better avoid buckling during compression, a horizontal support plate 123 can also be provided. The upper horizontal support plate 123 is provided on the upper plate 120 and the lower plate 121, and is arranged to intersect with the support bar 122 to form a grid structure. In other embodiments, only the support bar 122 structure can be provided.

[0073] In this embodiment, combined with Figures 11-13 As shown, the upper pressure plate assembly 13 has at least a top plate 130, which has a U-shaped structure with the opening facing downwards. Two top sliding plates 131 are arranged inside the U-shaped structure. Each top sliding plate 131 has an adjusting screw 14 on its outer side. The top sliding plates 131 slide relative to each other through the adjusting screw 14. The top edge of the test sample 2 is clamped in the inner part of the two top sliding plates 131 that are arranged opposite to each other. An upper pressure plate 132 is arranged inside the upper pressure plate assembly 13. The upper pressure plate 132 is located between the inner side of the top plate 130 and the top sliding plate 131. A scale line 1320 is arranged on its outer side to position the test sample 2. A handle 133 is also provided on the outer side of the upper pressure plate assembly 13 for easy disassembly.

[0074] Based on the above structure, the application process of the composite material damage residual strength testing device 1 in this embodiment is as follows:

[0075] First, place the base assembly 10 and the side support assembly 11 assembly on the test bench of the compression testing machine. Adjust the position of the side support assembly 110 according to the width of the test sample 2 using the adjusting bolts on the base plate 100, so that there is a gap of 0.8-1.5mm between the two sides of the test sample 2 and the side slide plate 1102 in the side support assembly 110.

[0076] Then, install the anti-instability components 12 on the front and rear sides of the test sample 2. There are pin holes 11001 on the side support plate 11001100. First, align the pin holes 11001, hang the anti-instability components 12 on the outside of the side support plate 11001100, and then tighten the bolts to make the support bar 122 contact the test sample 2 and press a certain force.

[0077] Finally, adjust the positioning lines on the upper pressure plate assembly 13, install the upper pressure plate assembly 13, so that the test sample 2 is in the middle position, tighten the adjusting screws 14 on both sides of the top slide plate 131 so that the gap between the top slide plate 131 and the test sample 2 is less than 0.05mm, and start the test.

[0078] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A device for testing the residual strength of composite materials after damage, characterized in that, At least have: The base assembly is the support part of the testing device and has a base plate. A clamping assembly is provided on the base plate. The bottom of the sample to be tested is clamped on the clamping assembly. The testing device is set on the testing platform of the testing machine through the base assembly. A side support assembly is installed above the base plate and has at least two separately configured side support plate assemblies. The test sample is installed between the two separately configured side support plate assemblies and is clamped therebetween. An anti-buckling component is installed opposite to the two side support plate components on the outside and between the two side support plate components. Its two ends are respectively connected to the two side support plate components. The test sample is placed in the area enclosed by the anti-buckling component and the side support plate components to prevent the test sample from buckling during compression. The upper pressure plate assembly is installed above the side support assembly to position and clamp the end face of the sample to be tested.

2. The composite material damage residual strength testing device as described in claim 1, characterized in that, The clamping assembly has at least one opposing support plate, and opposing clamping slide plates are provided between the opposing support plates. The test sample is clamped between the opposing clamping slide plates. Each clamping slide plate is connected to its adjacent support plate by an adjusting screw. The distance between the clamping slide plates is adjusted by the adjusting screw to clamp the test sample. A pad is also provided between the base plate and the clamping slide plates.

3. The composite material damage residual strength testing device as described in claim 2, characterized in that, The clamping slide plate is provided with a first sliding groove, and the base plate is provided with a first guide post. The first guide post is disposed in the first sliding groove, so that the first sliding groove and the first guide post form relative sliding and sliding limit, thereby achieving more effective clamping of the sample to be tested.

4. The composite material damage residual strength testing device as described in claim 1, characterized in that, Guide blocks are provided on both sides of the support plate on the base plate. The guide blocks are located on the outside of the side support assembly and limit the side support assembly. The base plate is also provided with baffles at both ends of the base plate. The baffles are provided with adjusting screws that abut against the side support assembly. By adjusting the adjusting screws, the side support assembly moves relative to the base plate, thereby achieving more effective clamping of the test sample.

5. The composite material damage residual strength testing device as described in claim 4, characterized in that, Each of the side support components has at least a side support plate and a support base. The side support plate and the support base are arranged in an L-shape. The support base is disposed on the base plate and is fixedly connected to the bottom of the side support plate on one side. The side support plate has a U-shaped structure, and the opening of the U-shaped structure faces the clamping direction of the sample to be tested.

6. The composite material damage residual strength testing device as described in claim 5, characterized in that, The support base is disposed inside the guide block and has a second sliding groove. A second guide post is disposed in the second sliding groove and the bottom end of the second guide post is disposed on the base plate. The second sliding groove and the second guide post can slide and limit relative to each other, thereby realizing the relative sliding and limiting of the support base and the side support plate connected to the support base.

7. The composite material damage residual strength testing device as described in claim 5, characterized in that, Each of the side support plate assemblies of the side support assembly also has a side sliding plate, which is disposed at the U-shaped structure of the side support plate, and two side sliding plates are disposed at the U-shaped structure of each side support plate. The test sample is clamped between the two side sliding plates. The side sliding plates are connected to the side support plate by adjusting screws. The relative sliding of the side sliding plates is achieved by adjusting screws, thereby achieving the clamping of the test sample.

8. The composite material damage residual strength testing device as described in claim 5, characterized in that, Each of the side support plate components of the side support assembly also has a reinforcing rib, which is a corner plate structure. The corner plate structure has at least two right-angled sides and one inclined side. The two right-angled sides abut against the two mutually perpendicular surfaces of the L-shaped structure formed by the side support plate and the support seat. Combined with the inclined side, the side support plate assembly as a whole has a triangular structure, which increases the stability of the side support plate assembly.

9. The composite material damage residual strength testing device as described in claim 1, characterized in that, The anti-instability component has at least an upper plate and a lower plate arranged on the same plane. The upper plate and the lower plate are connected to the side support plate assembly. There is a gap between the upper plate and the lower plate for observing the test process. Support bars are connected to the same side of the upper plate and the lower plate. The support bars are arranged perpendicular to the upper plate and the lower plate and are arranged facing the side of the test sample. One end of the support bars abuts against the test sample. U-shaped grooves are provided on the upper and lower plates to adjust the position of the support bar in the horizontal direction; At least three support bars are provided, and the support bars are arranged in parallel. The outer support bars are provided with notches to avoid the fracture location of the test sample.

10. The composite material damage residual strength testing device as described in claim 1, characterized in that, The upper pressure plate assembly has at least a top plate, which is U-shaped with the opening facing downward. Two top sliding plates are provided inside the U-shaped structure. Each top sliding plate has an adjusting screw on its outer side. The top sliding plates slide relative to each other through the adjusting screw. The test sample is clamped in the inner part of the two top sliding plates that are arranged opposite to each other. The upper pressure plate assembly has an upper pressure plate on its inner side, which is located between the inner side of the top plate and the top sliding plate. The upper pressure plate has scale lines on its outer side for positioning the sample. The upper pressure plate assembly also has a handle on its outer side for easy disassembly.

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