Anti-bending device for fiber reinforced plastic tensile shear test
By designing an anti-bending device, the problem of substrate bending in the tensile shear test of fiber-reinforced plastics was solved, ensuring the accuracy and reliability of the test results, avoiding substrate bending, and reducing frictional load.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING GUOCAI TESTING CO LTD
- Filing Date
- 2025-04-23
- Publication Date
- 2026-05-19
AI Technical Summary
During tensile and shear testing of fiber-reinforced plastics, the substrate near the test area is prone to bending, causing the test results to deviate from the true performance and affecting material evaluation and component design.
Design an anti-bending device including a clamping plate, a left sliding plate and a right sliding plate, which connects a rigid substrate with an adhesive, and sets a groove structure and roller clamping to prevent the substrate from bending and reduce friction load.
It effectively avoids substrate bending, improves the accuracy of tensile shear tests, reduces redundant loads, and ensures the reliability of test results.
Smart Images
Figure CN224262942U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of materials testing technology, and in particular to an anti-bending device for tensile shear testing of fiber-reinforced plastics. Background Technology
[0002] Fiber-reinforced plastics (FRPs) are advanced materials composed of fibers (carbon fiber, glass fiber, etc.) and a resin matrix. They are widely used in aerospace, rail transportation, and wind power generation due to their low density and excellent mechanical properties. When designing and selecting these materials, engineers need to reasonably evaluate their interlaminar shear properties to assess their interlaminar performance. This is typically done according to standards such as GB / T 7124-2008, ISO 4587:2003, and EN 1465:2009. However, when using these standards, the overlapping nature of the specimens causes bending of the substrate near the overlap area during testing. Even with sufficient substrate rigidity, bending is unavoidable. This means that at failure, the overlap area does not exhibit pure shear failure but often involves peeling failure, resulting in test results that are lower than theoretical or design values. This anomaly increases the deviation between test results and the actual interlaminar performance of FRPs, affecting engineers' evaluation of the material and the design of related components. Summary of the Invention
[0003] This application provides an anti-bending device for tensile shear testing of fiber-reinforced plastics, which is used to solve the abnormal bending phenomenon of the substrate near the test area, i.e., the overlap area, during the tensile shear testing of fiber-reinforced plastics, so as to improve the accuracy of tensile shear testing of fiber-reinforced plastics.
[0004] The above-mentioned objective of this application is achieved through the following technical solution: a bending-resistant device for tensile shear testing of fiber-reinforced plastics, comprising a clamping plate, a left sliding plate, and a right sliding plate, wherein the clamping plate comprises two oppositely arranged, the left sliding plate and the right sliding plate are respectively disposed on the left and right sides of the clamping plate and connected by a connector, and the tensile shear test specimen is located between the two clamping plates.
[0005] Furthermore, the tensile shear specimen includes a right rigid substrate and a left rigid substrate, which are bonded together by an adhesive, and the adhesive has a uniform thickness between the right and left rigid substrates.
[0006] Furthermore, the tensile shear specimen has a left groove and a right groove. The depth of the right groove is the same as the total thickness of the right rigid substrate plus the adhesive, and the depth of the left groove is the same as the total thickness of the left rigid substrate plus the adhesive, thus forming an overlapping structure. The test area of the tensile shear specimen is the overlapping area. This helps the clamping plate of the anti-bending device to fit completely with the specimen, avoiding substrate bending.
[0007] Furthermore, the clamping plate is a rigid plate with a flat surface and uniform thickness, and its length is sufficient to cover the overlap area and the left and right grooves of the tensile shear specimen. This helps the clamping plate to fit completely with the specimen, avoiding substrate bending.
[0008] Furthermore, the left and right sliding plates are provided with rotatable rollers, which contact the clamping plate, and the left and right sliding plates clamp the clamping plate through the rollers.
[0009] Furthermore, the left and right sliding plates each include a left sliding base plate and a right sliding base plate, respectively. The left and right sliding base plates each have a left roller groove and a right roller groove, respectively. A roller is located in the left and right roller grooves, and the sides of the left and right sliding base plates each have a left roller hole and a right roller hole, respectively. The roller has a roller rod, which is fitted into the left or right roller hole. This helps the clamping plate to fit completely against the sample, avoiding substrate bending, and also reduces redundant loads caused by friction between the device and the sample after the sample is mounted.
[0010] Furthermore, the connecting component between the left and right sliding plates is a bolt. One of the left and right sliding plates has a threaded hole adapted to the bolt, and the other has a through hole adapted to the bolt. The diameter of the through hole is larger than the diameter of the bolt.
[0011] After the anti-bending device is installed, the tensile shear specimen is installed on the universal testing machine, and a tensile load P is applied to the tensile shear specimen. This can effectively prevent the substrate bending phenomenon of the fiber reinforced plastic tensile shear specimen during the test, and at the same time reduce the redundant load caused by friction after the device is installed on the specimen.
[0012] In summary, the beneficial effects of this application are as follows: by using this device, the substrate bending phenomenon of fiber reinforced plastic tensile shear specimens during the test can be effectively avoided, and the redundant load caused by friction between the device and the specimen after the specimen is installed is reduced. Attached Figure Description
[0013] Figure 1 This is an assembly drawing of the present utility model;
[0014] Figure 2 This is a diagram of the tensile shear specimen for this utility model.
[0015] Figure 3 This is a front view of the left / right sliding plate of this utility model;
[0016] Figure 4 This is a side view of the device with the left / right sliding plate.
[0017] In the figure, 1 is the tensile shear specimen; 2 is the right sliding plate; 3 is the clamping plate; 4 is the left sliding plate; 5 is the bolt; 6 is the roller; 7 is the roller rod; 1-1 is the left rigid base plate; 1-2 is the right rigid base plate; 1-3 is the adhesive; 1-4-1 is the right groove; 1-4-2 is the left groove; 1-5 is the overlapping area; 2-1 is the through hole; 2-2 is the right roller groove; 2-3 is the right roller hole; 2-4 is the right sliding base plate; 4-1 is the threaded hole; 4-2 is the left roller groove; 4-3 is the left roller hole; 4-4 is the left sliding base plate. Detailed Implementation
[0018] The specific embodiments of this application are described in detail below with reference to the accompanying drawings.
[0019] Example: Reference Figure 1-4 A bending prevention device for tensile shear testing of fiber-reinforced plastics is disclosed. By using this device, the bending phenomenon of the substrate of the fiber-reinforced plastic tensile shear specimen 1 during the test can be effectively avoided, and the redundant load caused by friction between the device and the specimen after the specimen is installed is reduced.
[0020] The anti-bending device includes a clamping plate 3, a left sliding plate 4, and a right sliding plate 2. The clamping plate 3 includes two plates arranged opposite each other. The left sliding plate 4 and the right sliding plate 2 are respectively arranged on the left and right sides of the clamping plate 3 and connected by a connector. The tensile shear specimen 1 to be tested is located between the two clamping plates 3.
[0021] The tensile shear specimen 1 includes a right rigid substrate 1-2 and a left rigid substrate 1-1, which are bonded together by an adhesive 1-3. The adhesive 1-3 has a uniform thickness between the right rigid substrate 1-2 and the left rigid substrate 1-1.
[0022] The tensile shear specimen 1 has a left groove 1-4-2 and a right groove 1-4-1. The depth of the right groove 1-4-1 is the same as the total thickness of the right rigid substrate 1-2 plus the adhesive 1-3, and the depth of the left groove 1-4-2 is the same as the total thickness of the left rigid substrate 1-1 plus the adhesive 1-3, thus forming an overlapping structure. The test area of the tensile shear specimen 1 is the overlapping area 1-5. This helps the clamping plate of the anti-bending device to fit completely with the specimen, avoiding substrate bending.
[0023] The clamping plate 3 is a rigid plate with a flat surface and uniform thickness. The length of the clamping plate 3 is sufficient to cover the overlap area 1-5 and the left groove 1-4-2 and right groove 1-4-1 of the tensile shear specimen 1. This helps the clamping plate to fit completely with the specimen and avoids bending of the substrate.
[0024] The left sliding plate 4 and the right sliding plate 2 are provided with rotatable rollers 6. The rollers 6 are in contact with the clamping plate 3, and the left sliding plate 4 and the right sliding plate 2 clamp the clamping plate 3 through the rollers 6.
[0025] The left sliding plate 4 and the right sliding plate 2 each include a left sliding substrate 4-4 and a right sliding substrate 2-4, respectively. The left sliding substrate 4-4 and the right sliding substrate 2-4 each have a left roller shaft groove 4-2 and a right roller shaft groove 2-2, respectively. A roller shaft 6 is located in the left roller shaft groove 4-2 and the right roller shaft groove 2-2. The left sliding substrate 4-4 and the right sliding substrate 2-4 each have a left roller shaft hole 4-3 and a right roller shaft hole 2-3 on their sides, respectively. The roller shaft 6 has a roller shaft rod 7, which is fitted into either the left roller shaft hole 4-3 or the right roller shaft hole 2-3. This helps the clamping plate to fit completely against the sample, avoiding substrate bending, and also reduces the redundant load caused by friction between the device and the sample after the sample is mounted.
[0026] The connecting piece between the left sliding plate 4 and the right sliding plate 2 is a bolt 5. One of the left sliding plate 4 and the right sliding plate 2 is provided with a threaded hole 4-1 adapted to the bolt 5, and the other is provided with a through hole 2-1 adapted to the bolt 5. The diameter of the through hole 2-1 is larger than the diameter of the bolt 5.
[0027] After the anti-bending device is installed, the tensile shear specimen is installed on the universal testing machine, and a tensile load P is applied to the tensile shear specimen. This can effectively prevent the substrate bending phenomenon of the fiber reinforced plastic tensile shear specimen during the test, and at the same time reduce the redundant load caused by friction after the device is installed on the specimen.
[0028] When using the anti-bending device for tensile shear testing of fiber-reinforced plastics provided in this application to perform tensile shear testing on fiber-reinforced plastics, the testing process is as follows:
[0029] Step 1: Select the right rigid substrate 1-1, left rigid substrate 1-2, and adhesive 1-3 according to the test requirements and relevant standards. The right rigid substrate 1-1 and left rigid substrate 1-2 are bonded together using adhesive 1-3, with adhesive 1-3 having a uniform thickness between them. The left groove 1-4-2 and right groove 1-4-1 can be pre-formed during bonding, or formed by machining after bonding the right rigid substrate 1-1 and left rigid substrate 1-2. The depth of the right groove 1-4-1 is the same as the total thickness of the right rigid substrate 1-1 plus adhesive 1-3, and the depth of the left groove 1-4-2 is the same as the total thickness of the left rigid substrate 1-2 plus adhesive 1-3, thus forming an overlapping structure. The overlapping area 1-5 is the test area. The specimen formed in this step is the tensile shear specimen 1.
[0030] Step 2: Roller 6 is placed into the right roller groove 2-2, and roller rod 7 passes through the right roller hole 2-3 and roller 6, so that roller 6 is assembled onto the right sliding base plate 2-4 to form the right sliding plate 2. Roller 6 is placed into the left roller groove 4-2, and roller rod 7 passes through the left roller hole 4-3 and roller 6, so that roller 6 is assembled onto the left sliding base plate 4-4 to form the left sliding plate 4.
[0031] Step 3: The two clamping plates 3 are attached to the tensile shear specimen 1, and the clamping plates 3 are made to cover the overlapping area 1-5, the right groove 1-4-1 and the left groove 1-4-2 of the tensile shear specimen 1.
[0032] Step 4: The rollers 6 on the left sliding plate 4 and the right sliding plate 2 are attached to the clamping plate 3. The bolt 5 is screwed into the threaded hole 4-1 of the left sliding plate 4 through the bolt through hole 2-1, so that the left sliding plate 4 and the right sliding plate 2 clamp the clamping plate 3, thereby clamping the tensile shear specimen 1.
[0033] Step 5: After the anti-bending device is installed, the tensile shear specimen 1 is installed on the universal testing machine, and a tensile load P is applied to the tensile shear specimen 1 for testing.
[0034] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of this application, and these all fall within the protection scope of this application.
Claims
1. A bending-resistant device for tensile shear testing of fiber-reinforced plastics, characterized in that, It includes a clamping plate (3), a left sliding plate (4) and a right sliding plate (2). The clamping plate (3) includes two plates arranged opposite to each other. The left sliding plate (4) and the right sliding plate (2) are respectively arranged on the left and right sides of the clamping plate (3) and connected by a connector. The tensile shear specimen (1) to be tested is located between the two clamping plates (3).
2. The anti-bending device for tensile shear testing of fiber-reinforced plastics according to claim 1, characterized in that, The tensile shear specimen (1) includes a right rigid substrate (1-2) and a left rigid substrate (1-1). The right rigid substrate (1-2) and the left rigid substrate (1-1) are bonded together by an adhesive (1-3). The adhesive (1-3) has a uniform thickness between the right rigid substrate (1-2) and the left rigid substrate (1-1).
3. The anti-bending device for tensile shear testing of fiber-reinforced plastics according to claim 2, characterized in that, The tensile shear specimen (1) is provided with a left groove (1-4-2) and a right groove (1-4-1). The depth of the right groove (1-4-1) is the same as the total thickness of the right rigid substrate (1-2) plus the adhesive (1-3). The depth of the left groove (1-4-2) is the same as the total thickness of the left rigid substrate (1-1) plus the adhesive (1-3), thus forming an overlapping structure. The test area of the tensile shear specimen (1) is the overlapping area (1-5).
4. The anti-bending device for tensile shear testing of fiber-reinforced plastics according to claim 2 or 3, characterized in that, The clamping plate (3) is a rigid plate with a flat surface and uniform thickness. The length of the clamping plate (3) can cover the overlap area (1-5) and the left groove (1-4-2) and right groove (1-4-1) of the tensile shear specimen (1).
5. The anti-bending device for tensile shear testing of fiber-reinforced plastics according to claim 1, characterized in that, The left sliding plate (4) and the right sliding plate (2) are provided with rotatable rollers (6), which are in contact with the clamping plate (3). The left sliding plate (4) and the right sliding plate (2) clamp the clamping plate (3) through the rollers (6).
6. The anti-bending device for tensile shear testing of fiber-reinforced plastics according to claim 5, characterized in that, The left sliding plate (4) and the right sliding plate (2) respectively include a left sliding base plate (4-4) and a right sliding base plate (2-4). The left sliding base plate (4-4) and the right sliding base plate (2-4) respectively have a left roller groove (4-2) and a right roller groove (2-2). The roller (6) is located in the left roller groove (4-2) and the right roller groove (2-2). The left sliding base plate (4-4) and the right sliding base plate (2-4) are respectively provided with a left roller hole (4-3) and a right roller hole (2-3) on their sides. The roller (6) has a roller rod (7). The roller rod (6) is assembled in the left roller hole (4-3) or the right roller hole (2-3).
7. The anti-bending device for tensile shear testing of fiber-reinforced plastics according to claim 1, characterized in that, The connecting piece between the left sliding plate (4) and the right sliding plate (2) is a bolt (5). One of the left sliding plate (4) and the right sliding plate (2) is provided with a threaded hole (4-1) adapted to the bolt (5), and the other is provided with a through hole (2-1) adapted to the bolt (5). The diameter of the through hole (2-1) is larger than the diameter of the bolt (5).