CN108982248B - Method for testing shear strength of composite material by using test device - Google Patents
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- CN108982248B CN108982248B CN201810796221.2A CN201810796221A CN108982248B CN 108982248 B CN108982248 B CN 108982248B CN 201810796221 A CN201810796221 A CN 201810796221A CN 108982248 B CN108982248 B CN 108982248B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a method for testing the shear strength of a composite material by using a testing device, which specifically comprises the following steps: fixing the upper pressing plate and the lower pressing plate on the testing machine; prepressing the upper pressing plate and the lower pressing plate to enable the lower end surface of the upper pressing plate to be parallel to the upper end surface of the lower pressing plate; fixing a shearing sample on a shearing mechanism; placing the shearing mechanism fixed with the shearing sample on a lower pressing plate; and applying a load to the shear sample, generating corresponding deformation at the convex end of the shear sample, unloading the load when the stress load of the shear sample reaches the maximum value and is reduced by more than 30% from the maximum load point, and finishing the test. The method can reflect the real shear strength of the composite material to obtain the accurate shear strength of the composite material so as to verify the shear resistance of the welding transition layer of different materials, not only provides design basic data and ensures the use reliability of the composite material, but also is beneficial to improving the ship construction quality.
Description
Technical Field
The invention relates to the technical field of mechanical and technological performance tests of composite materials for portable ship structures, in particular to a method for testing the shear strength of a composite material by using a test device.
Background
In recent years, the number of lightweight ships to be constructed has been steadily increased, and the ships need to reduce the weight of the whole ship as much as possible on the premise of ensuring the structural strength of the ship body, so that the composite material can be widely used. The composite steel plate mainly uses steel plate as base material, and uses stainless steel, nonferrous metal and alloy as composite material, and adopts the processing methods of rolling, explosion, build-up welding and casting to make the invented single-face and double-face composite steel plate.
The detection of the performance of the composite material comprises test items such as bonding strength, shear strength, bonding degree, bending, impact, pull-off and the like, wherein the shear strength test has larger data deviation due to the influence of a test device, a test method and the like. The composite material is generally used for the joint of two materials in a ship body structure to play roles of connection and transition, and if the real shear strength of the composite material cannot be objectively reflected, the joint is cracked or deformed after the composite material is used, so that the product quality faces the test.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, designs a method for testing the shear strength of a composite material by using a testing device, can accurately and quickly test the shear strength of the composite material, objectively reflects the real shear strength of the composite material, ensures the use reliability of the composite material, can obtain the shear deformation resistance curve of the composite material, and can meet the analysis requirements of multi-specification and batch design and acceptance of the composite material.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for testing the shear strength of a composite material by using a testing device comprises an upper pressure plate, a lower pressure plate and a shearing mechanism, wherein the shearing mechanism comprises a shearing support, a movable baffle arranged in the shearing support, a fixed baffle fixed at the end part of the shearing support, and an adjusting mechanism which penetrates through the fixed baffle and is fixed at the end part of the movable baffle,
the method specifically comprises the following steps:
step 1: fixing an upper pressure plate on a cross beam of the testing machine, and fixing a lower pressure plate on a platform of the testing machine, wherein the lower pressure plate comprises a concave pressure plate and a convex pressure plate embedded in the concave pressure plate;
step 2: moving the upper pressing plate downwards, and pre-pressing the pressing plate to separate the upper pressing plate from the lower pressing plate, wherein the lower end surface of the upper pressing plate is parallel to the upper end surface of the lower pressing plate;
and step 3: adjusting a shearing mechanism, and placing a shearing sample between a movable baffle and a shearing support to ensure that a gap of 0.1-0.15 mm is reserved between the movable baffle and the shearing sample; the top of the shearing sample is in a convex arc shape, and the convex end of the shearing sample is placed on the shearing support;
and 4, step 4: placing the shearing mechanism fixed with the shearing sample on the lower pressing plate, and enabling the shearing sample to be located in the middle of the lower pressing plate;
and 5: and moving the upper pressing plate downwards, applying a load to the shear sample by using a testing machine, generating corresponding deformation at the convex end of the shear sample, respectively detecting the stress load and the deformation condition of the shear sample by using a pressure sensor and a displacement sensor which are arranged on the testing machine, acquiring an anti-shear deformation curve of the shear sample, and when the stress load of the shear sample reaches the maximum value and is reduced by more than 30% from the maximum load point, slipping or dropping the convex end of the shear sample, unloading the load, and finishing the test.
Preferably, the adjusting mechanism comprises an adjusting handle and a screw rod, the end face of the adjusting handle is provided with scales, the adjusting handle is fixed at one end of the screw rod, and the other end of the screw rod penetrates through the fixed baffle plate and is fixed on the movable baffle plate; the fixed baffle is provided with a pointer, and the fingertip of the pointer and the end surface of the adjusting handle are positioned on the same plane;
the step 3 of adjusting the shearing mechanism and placing the shearing sample between the movable baffle and the shearing support comprises the following specific steps:
step 3.1: rotating the adjusting handle anticlockwise, adjusting the distance between the movable baffle and the shearing support, and placing the shearing sample between the movable baffle and the shearing support, wherein the convex end of the shearing sample is placed on the shearing support;
step 3.2: rotating the adjusting handle clockwise to enable the movable baffle and the shearing support to clamp the shearing sample, enabling the movable baffle and the shearing support to be in close contact, inverting the shearing mechanism to enable the shearing sample not to fall off, and recording the scale value pointed by the pointer on the adjusting handle at the moment;
step 3.3: and rotating the adjusting handle anticlockwise to adjust the distance between the movable baffle and the shear test so as to ensure that a gap of 0.1-0.15 mm is reserved between the movable baffle and the shear test sample.
Preferably, the relationship between the moving distance of the screw and the number of scales for rotating the adjusting handle is
Wherein A is the number of the scale grids for adjusting the rotation of the handle, and P is the moving distance for the rotation of the screw rod.
Preferably, the load applied when the pressing plate is pre-pressed in the step 2 is 5kN to 10 kN.
Preferably, the loading rate of the test machine applying load to the shear sample in the step 5 is 3MPa/s-5 MPa/s.
Preferably, the cutting support is composed of a base body and two cutting plates vertically fixed on the base body, the base body and the two cutting plates jointly form a U-shaped structure, and the movable baffle is located inside the U-shaped structure and can reciprocate under the driving of the adjusting mechanism.
Preferably, the shear support has an overall Vickers hardness of not less than 400HV, a top surface Vickers hardness of not less than 600HV, and an angle between the top surface and the surface contacting the sample
The radius of the arc of the included angle is less than 0.1 mm.
Preferably, the verticality tolerance of the contact surface between the moving baffle and the shearing sample is not more than 0.03mm, and the roughness of the contact surface of the shearing sample is not more than 0.8 μm.
Preferably, the lower end face of the concave pressing plate is a plane, the upper end face of the concave pressing plate is a concave spherical surface, a lower connecting shaft is fixed on the lower end face of the concave pressing plate, and the lower connecting shaft is fixed in a connecting hole of the testing machine platform; the lower end face of the convex pressing plate is a convex spherical surface, the upper end face of the convex pressing plate is a plane, and the lower end face of the convex pressing plate is embedded in the concave pressing plate.
Preferably, the upper pressing plate is a plane plate, an upper connecting shaft is fixed on the upper end face of the plane plate, and the upper connecting shaft of the upper pressing plate is fixed in a connecting hole of the cross beam of the testing machine.
The invention has the following positive beneficial effects:
1. the invention can accurately and quickly test the shear strength of the composite material, reflect the real shear strength of the composite material, obtain the accurate shear strength of the composite material, verify the shear resistance of the welding transition layer of different materials, provide design basic data, ensure the use reliability of the composite material and be beneficial to improving the ship building quality.
2. The shear deformation resistance curve of the composite material obtained in the test process can reflect various strain data generated by the composite material joint surface under the stress condition, and can meet the analysis requirements of multi-specification and batch design and acceptance of the composite material.
3. The lower pressing plate is composed of a concave pressing plate and a convex pressing plate, the top of the cut sample is designed to be arc-shaped, when the upper pressing plate and the lower pressing plate are pre-pressed, the concave pressing plate and the convex pressing plate of the lower pressing plate can be automatically adjusted, so that the load can be automatically adjusted to the vertical position of a sample test surface, the sample test surface is uniformly subjected to the applied load, and test data can not deviate due to load deflection.
4. Through setting up the scale on adjustment handle's terminal surface, installation pointer on fixed stop, through the relation between scale and the screw rod pitch, through calculating alright accurate adjustment sample and shearing support, moving the interval between the baffle, can be convenient, swift, accurate test the combined material shear strength, help improving the precision of test data equally.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of the method of the present invention.
FIG. 2 is a schematic structural view of the test apparatus.
Fig. 3 is a top view of the shearing mechanism.
FIG. 4 is a side view of the test apparatus in the direction A.
Fig. 5 is a front view of a shear specimen.
Fig. 6 is a side view of a shear specimen.
FIG. 7 is a diagram showing a state of use of the test apparatus.
FIG. 8 is a shear deformation resistance curve of a shear specimen.
The specific meanings of the reference numbers in the figures are: the device comprises an upper pressing plate 1, a lower pressing plate 2, a concave pressing plate 3, a convex pressing plate 4, a shearing support 5, a fixed baffle 6, an adjusting mechanism 7, a movable baffle 8, a shearing sample 9, a seat body 10, a shearing plate 11, an adjusting handle 12, a screw rod 13, a scale 14, a pointer 15, a lower connecting shaft 16, an upper connecting shaft 17 and a raised end 18 for shearing the sample.
Detailed Description
In order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The embodiment is described with reference to fig. 1 to 8, and the method for testing the shear strength of the composite material by using the testing device can accurately and quickly test the shear strength of the composite material, objectively reflect the real shear strength of the composite material, and ensure the use reliability of the composite material.
The testing device comprises an upper pressure plate 1, a lower pressure plate 2 and a shearing mechanism, wherein the shearing mechanism is arranged between the upper pressure plate 1 and the lower pressure plate 2, and the diameter of the upper pressure plate 1 is equal to that of the lower pressure plate 2.
The upper pressing plate 1 is a plane plate, an upper connecting shaft 17 is fixed on the upper end face of the plane plate, and the upper connecting shaft of the upper pressing plate 1 is fixed in a connecting hole of a cross beam of the testing machine, so that the upper pressing plate 1 is fixed at the lower end of the cross beam of the testing machine.
The lower press plate 2 is divided into two parts, namely a concave press plate 3 and a convex press plate 4 which is embedded in the concave press plate. The lower end face of the concave pressing plate 3 is a plane, the upper end face of the concave pressing plate 3 is a concave spherical surface, a lower connecting shaft 16 is fixed on the lower end face of the concave pressing plate 3, and the lower connecting shaft 16 is fixed in a connecting hole of a testing machine platform. The lower end face of the convex pressing plate 4 is a convex spherical surface, and the upper end face is a plane. The radian of the convex spherical surface of the convex pressing plate 4 is matched with that of the concave spherical surface of the concave pressing plate 3, so that the lower end surface of the convex pressing plate 4 is embedded in the concave pressing plate 3.
When two opposite surfaces of the upper pressing plate 1 and the lower pressing plate 2 are contacted together under the action of a certain load, the convex spherical surfaces and the concave spherical surfaces of the concave pressing plate 3 and the convex pressing plate 4 of the lower pressing plate can be automatically adjusted, and the two opposite surfaces of the upper pressing plate 1 and the lower pressing plate 2 are ensured to be completely parallel.
Shear the mechanism including shearing support 5, fixed stop 6, adjustment mechanism 7 and moving baffle 8, fixed stop 6 sets up the tip at shearing support 5, and adjustment mechanism 7 passes fixed stop 6 and its end fixing on moving baffle 8, and moving baffle 8 is located and shears between support 5 and the fixed stop 6, and the setting of shearing sample 9 is between moving baffle 8 and shearing support 5. When the shear specimen 9 is placed between the movable fence 8 and the shear support 5, a gap of 0.1mm to 0.15mm is left between the movable fence 8 and the shear specimen 9. In the present embodiment, the top of the shear specimen 9 is in the shape of a convex arc and the convex end 18 thereof rests on the shear support 5, the verticality tolerance of the contact surface between the movable baffle 8 and the shear specimen 9 is not more than 0.03mm, and the roughness of the contact surface of the shear specimen 9 is not more than 0.8 μm. The whole Vickers hardness of the shearing support 5 is not less than 400HV, the Vickers hardness of the top surface is not less than 600HV, and the included angle between the top surface and the surface contacting with the sample is
The radius of the arc of the included angle is less than 0.1 mm.
The cutting support 5 is composed of a base body 10 and two cutting plates 11 vertically fixed on the base body, the base body 10 and the two cutting plates 11 jointly form a U-shaped structure, and the movable baffle 8 is located inside the U-shaped structure and can move back and forth under the driving of the adjusting mechanism 7. When moving barrier 8 moves leftward, the distance between moving barrier 8 and housing 10 can be reduced, and when moving barrier 8 moves rightward, the distance between moving barrier 8 and housing 10 can be increased.
The adjusting mechanism 7 is used for adjusting the distance between the movable baffle 8 and the shearing support 5, so that the movable baffle 8 can move back and forth (i.e. move left or right) under the driving of the adjusting mechanism. The adjusting mechanism 7 comprises an adjusting handle 12 and a screw 13, scales 14 are arranged on the end face of the adjusting handle 12, and the scale is used for adjusting the size of the productIn the embodiment, the scale on the end face of the adjustment handle 12 equally divides the entire circumference thereof into 60 divisions. The adjusting handle 12 is fixed at one end of the screw 13, and the other end of the screw 13 penetrates through the fixed baffle 6 so as to be fixed on the movable baffle 8; the fixed baffle 6 is provided with a pointer 15, and the fingertip of the pointer 15 and the end surface of the adjusting handle 12 are positioned on the same plane. The adjustment handle 12 is turned one rotation clockwise or counterclockwise and the screw 13 is moved a certain distance forward or backward accordingly. The relationship between the moving distance of the screw rod 13 and the scale on the end face of the adjusting handle 12 is
Wherein A is the number of the scale grids for adjusting the rotation of the handle, and P is the moving distance for the rotation of the screw rod. Thus, the distance between the moving stop 8 and the shear support 5 or shear specimen 9 can be adjusted by turning the adjustment handle 12.
When the shear strength of the composite material is tested by using a testing device, the method specifically comprises the following testing steps:
step 1: and (3) fixing the upper pressure plate 1 on the cross beam of the testing machine, namely fixing an upper connecting shaft 17 on the upper pressure plate into a connecting hole of the cross beam of the testing machine. And fixing the lower pressing plate 2 on the platform of the testing machine, namely fixing the lower connecting shaft 16 on the concave pressing plate into the connecting hole of the platform of the testing machine.
Step 2: the upper pressing plate 1 is moved downwards, the pressing plate 2 is pressed in advance under the load of 5 kN-10 kN, after the upper pressing plate 1 and the lower pressing plate 2 are completely attached, the concave spherical surface and the convex spherical surface between the concave pressing plate and the convex pressing plate of the lower pressing plate 2 can be automatically adjusted, so that after the upper pressing plate 1 is separated from the lower pressing plate 2, the lower end surface of the upper pressing plate 1 is parallel to the upper end surface of the lower pressing plate 2.
And step 3: the shear mechanism is adjusted to place the shear specimen 9 between the moving stop 8 and the shear support 5.
When the shearing mechanism is adjusted, firstly, the adjusting handle 12 is rotated anticlockwise, the distance between the movable baffle 8 and the shearing support 5 is adjusted, the convex end 18 of the shearing sample faces the shearing support 5 and is placed between the movable baffle 8 and the shearing support 5, the convex end 18 of the shearing sample is placed on the shearing support 5, and the top of the shearing sample 9 is in a convex arc shape; then, the adjusting handle 12 is rotated clockwise, so that the movable baffle 8 and the shearing support 5 clamp the shearing sample 9, the three are in close contact, the clamping force is not too large, the shearing sample 9 is not dropped after the shearing mechanism is inverted, and the scale value pointed by the pointer 15 on the adjusting handle 12 at the moment is recorded; and finally, rotating the adjusting handle 12 anticlockwise to adjust the distance between the movable baffle 8 and the shear test 9, so that a gap of 0.1-0.15 mm is reserved between the movable baffle 8 and the shear test 9.
And 4, step 4: and placing the shearing mechanism fixed with the shearing sample on the lower pressing plate 2, so that the shearing sample 9 is positioned in the middle of the lower pressing plate 2, and the highest point at the top of the shearing sample 9 is centered. When the shearing mechanism is placed, the position of the pre-pressed lower pressing plate cannot be deviated.
And 5: and (3) moving the upper pressing plate 1 downwards, applying a load to the shear sample by the testing machine at a loading rate of 3-5 MPa/s, and generating corresponding deformation at the convex end of the shear sample 9. In the process of applying load, a pressure sensor and a displacement sensor of the testing machine respectively detect the stress load and the deformation condition of the shear sample 9, and an anti-shear deformation curve of the shear sample is obtained according to a pressure signal and a displacement signal detected by the sensors, wherein the anti-shear deformation curve is a force-displacement curve between the stress load and the deformation of the protruding end of the shear sample. When the stress load of the shear sample reaches the maximum value and is reduced by more than 30% from the maximum load point, the convex end 18 of the shear sample slips or falls off, the load is removed, and the test is finished. According to the formula
And calculating the shear strength of the shear sample, wherein tau is the shear strength, F is the maximum load borne by the shear sample, W is the width of the sheared surface of the shear sample, and B is the length of the sheared surface.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will appreciate that; modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (10)
1. A method for testing the shear strength of a composite material by using a testing device is characterized in that the testing device comprises an upper pressure plate (1), a lower pressure plate (2) and a shearing mechanism, the shearing mechanism comprises a shearing support (5), a movable baffle (8) arranged in the shearing support, a fixed baffle (6) fixed at the end part of the shearing support, and an adjusting mechanism (7) which penetrates through the fixed baffle (6) and is fixed at the end part of the movable baffle (8),
the method specifically comprises the following steps:
step 1: fixing an upper pressing plate (1) on a cross beam of a testing machine, fixing a lower pressing plate (2) on a platform of the testing machine, wherein the lower pressing plate (2) comprises a concave pressing plate (3) and a convex pressing plate (4) embedded in the concave pressing plate;
step 2: the upper pressing plate (1) is moved downwards, the lower pressing plate (2) is pre-pressed, and after the upper pressing plate (1) is separated from the lower pressing plate (2), the lower end face of the upper pressing plate (1) is parallel to the upper end face of the lower pressing plate (2);
and step 3: adjusting a shearing mechanism, and placing a shearing sample (9) between a movable baffle (8) and a shearing support (5) to ensure that a gap of 0.1-0.15 mm is reserved between the movable baffle (8) and the shearing sample (9); the top of the shearing sample (9) is in a convex arc shape, and the convex end of the shearing sample is placed on the shearing support (5);
and 4, step 4: placing the shearing mechanism fixed with the shearing sample on the lower pressing plate (2) to enable the shearing sample (9) to be located in the middle of the lower pressing plate (2);
and 5: the upper pressing plate (1) is moved downwards, the testing machine applies load to the shearing sample (9), the convex end (18) of the shearing sample generates corresponding deformation, the pressure sensor and the displacement sensor of the testing machine detect the stress load and the deformation condition of the shearing sample respectively, the anti-shearing deformation curve of the shearing sample is obtained, when the stress load of the shearing sample reaches the maximum value and is reduced by more than 30% from the maximum load point, the convex end of the shearing sample slides or falls, the load is removed, and the test is finished.
2. The method for testing the shear strength of a composite material by using a testing device as claimed in claim 1, wherein the adjusting mechanism (7) comprises an adjusting handle (12) and a screw rod (13), the end surface of the adjusting handle (12) is provided with a scale (14), the adjusting handle (12) is fixed at one end of the screw rod (13), and the other end of the screw rod (13) passes through the fixed baffle (6) to be fixed on the movable baffle (8); a pointer (15) is installed on the fixed baffle (6), and the fingertip of the pointer (15) and the end face of the adjusting handle (12) are located on the same plane;
the step 3 of adjusting the shearing mechanism and placing the shearing sample between the movable baffle and the shearing support comprises the following specific steps:
step 3.1: rotating an adjusting handle (12) anticlockwise, adjusting the distance between a movable baffle (8) and a shearing support (5), and placing a shearing sample (9) between the movable baffle (8) and the shearing support (5), wherein a convex end (18) of the shearing sample is placed on the shearing support (5);
step 3.2: clockwise rotating the adjusting handle (12) to enable the movable baffle (8) and the shearing support (5) to clamp the shearing sample (9), enabling the movable baffle and the shearing support to be in close contact, inverting the shearing mechanism to ensure that the shearing sample does not fall off, and recording the scale value pointed by the pointer on the adjusting handle at the moment;
step 3.3: and the adjusting handle (12) is rotated anticlockwise to adjust the distance between the movable baffle (8) and the shearing sample (9), so that a gap of 0.1-0.15 mm is reserved between the movable baffle (8) and the shearing sample (9).
3. The method for testing the shear strength of a composite material using a test device as set forth in claim 2, wherein the relationship between the moving distance of the screw (13) and the number of scales of the rotation of the adjustment handle (12) is
Wherein A is the number of the scale grids for adjusting the rotation of the handle, and P is the moving distance for the rotation of the screw rod.
4. The method for testing the shear strength of a composite material according to claim 1, wherein the load applied when the press plate is pre-pressed in the step 2 is 5kN to 10 kN.
5. The method for testing the shear strength of a composite material according to claim 1, wherein the loading rate of the loading of the shear specimen by the testing machine in the step 5 is 3MPa/s to 5 MPa/s.
6. The method for testing the shear strength of a composite material by using a testing device as claimed in claim 1, wherein the shear support (5) is composed of a base body (10) and two shear plates (11) vertically fixed on the base body, the base body (10) and the two shear plates (11) together form a U-shaped structure, and the movable baffle (8) is located inside the U-shaped structure and can be moved back and forth under the driving of the adjusting mechanism (7).
7. The method for testing the shear strength of a composite material according to claim 6, wherein the shear support (5) has an overall Vickers hardness of not less than 400HV, a top surface Vickers hardness of not less than 600HV, and an angle between the top surface and the surface contacting the test piece
The radius of the arc of the included angle is less than 0.1 mm.
8. The method for testing the shear strength of a composite material using a test device according to claim 1 or 6, wherein the verticality tolerance of the contact surface between the moving barrier (8) and the shear specimen (9) is not more than 0.03mm, and the roughness of the contact surface of the shear specimen (9) is not more than 0.8 μm.
9. The method for testing the shear strength of the composite material by using the testing device according to claim 1, wherein the lower end surface of the concave pressing plate (3) is a plane, the upper end surface of the concave pressing plate (3) is a concave spherical surface, the lower end surface of the concave pressing plate (3) is fixed with a lower connecting shaft (16), and the lower connecting shaft (16) is fixed in a connecting hole of a platform of the testing machine; the lower end face of the convex pressing plate (4) is a convex spherical surface, the upper end face of the convex pressing plate (4) is a plane, and the lower end face of the convex pressing plate (4) is embedded in the concave pressing plate (3).
10. The method for testing the shear strength of a composite material using a testing apparatus according to claim 1, wherein the upper press plate (1) is a flat plate having an upper connecting shaft (17) fixed to an upper end surface thereof, and the upper connecting shaft (17) of the upper press plate is fixed in a connecting hole of a cross member of the testing machine.
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| CN109975133B (en) * | 2019-04-15 | 2024-01-09 | 华侨大学 | Vacuum brazing shear strength detection method and device |
| CN110595891B (en) * | 2019-10-09 | 2021-05-04 | 山东大学 | Test device and method for researching interaction and influence of structure |
| CN111157362B (en) * | 2020-01-14 | 2021-05-25 | 南京航空航天大学 | Nano-indentation instrument-based interface shear strength measuring device and testing method |
| CN117309597B (en) * | 2023-10-12 | 2024-01-30 | 四川纤谷塑业有限公司 | Basalt fiber composite material tray compression resistance test equipment and application method |
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| CN101487780A (en) * | 2008-12-26 | 2009-07-22 | 河北理工大学 | Method and apparatus for detecting non-work directional performance of medium plate |
| KR20160150175A (en) * | 2015-06-18 | 2016-12-29 | 한서대학교 산학협력단 | Multi-functional apparatus for testing shear stress |
| CN106969989A (en) * | 2017-05-16 | 2017-07-21 | 江南工业集团有限公司 | Fibre reinforced composites tubing interlaminar shear strength experimental rig and test method |
| CN107167373A (en) * | 2017-07-03 | 2017-09-15 | 东南大学 | Multi-functional circular cylindricality test specimen shearing test clamp |
| CN209102530U (en) * | 2018-07-19 | 2019-07-12 | 沪东中华造船(集团)有限公司 | A kind of Laminated Shear Deformable experimental rig |
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