WO2023098141A1 - Measurement sample and measurement method for tensile strength of interface surface between epoxy composite material and aluminium - Google Patents

Abstract

A measurement sample and a measurement method for the tensile strength of an interface surface between epoxy composite material and aluminum. The measurement sample comprises an epoxy composite material structural member (3), a first aluminum structural member (1), and a second aluminum structural member (2), wherein the epoxy composite material structural member (3) is in casting connection with the first aluminum structural member (1), and is in casting connection with the second aluminum structural member (2), and the surface area of the connection between the first aluminum structural member (1) and the epoxy composite material structural member (3) is greater than the surface area of the connection between the second aluminum structural member (2) and the epoxy composite structural member (3); a first connecting structure is arranged on the first aluminum structural member (1), and a second connecting structure is arranged on the second aluminum structural member (2). The connection between the first aluminum structural member (1) and the epoxy composite structural member (3) and between the second aluminum structural member (2) and the epoxy composite structural member (3) simulate connection modes between an epoxy composite material and aluminum, facilitating tension transmission. In addition, the interface surface between the second aluminum structural member (2) and the epoxy composite material structural member (3) is first to break, improving the accuracy of the measurement results, and providing a new way of testing to ensure the overall performance of a GIS/GIL insulating member.

Description

Test sample and method for measuring the tensile strength of the interface between epoxy composite material and aluminum

This application claims the priority of the Chinese patent application submitted to the China Patent Office on December 3, 2021, with the application number 202111513392.8, and the title of the invention is "Measurement sample and measurement method of tensile strength at the interface between epoxy composite material and aluminum" , the entire contents of which are incorporated in this application by reference.

technical field

The invention relates to the technical field of tensile testing, in particular to a sample and a measuring method for measuring the tensile strength of the interface between an epoxy composite material and aluminum.

Background technique

Gas insulated metal-enclosed switchgear (gas insulated switchgear, GIS for short) and gas insulated transmission lines (gas insulated transmission lines, GIL for short) both use metal aluminum as the shell to seal and compress SF6 gas or SF6/N2 mixed gas for insulation, and use different types of The insulator supports the conductor in the shell or separates the gas chamber to form a high-voltage, high-current power transmission device in which the shell and the conductor are coaxially arranged. GIS/GIL has the advantages of high reliability, small capacitance, low loss, strong overload capacity, and friendly electromagnetic environment. It is more and more widely used in the field of long-distance and large-capacity power transmission.

The internal insulating parts of GIS/GIL are all made of epoxy composite materials, which are casted at high temperature by liquid epoxy resin, fillers, curing agents, etc., and have the advantages of high mechanical strength and heat aging resistance. The insulating part and the shell of GIS/GIL are usually connected by casting. The actual engineering experience shows that it is difficult for defects to occur inside the epoxy composite material. The defect or failure of GIS/GIL generally occurs at the interface between the epoxy composite material and metal aluminum.

The tensile strength of the interface between the epoxy composite material and aluminum is a key parameter to ensure the good mechanical properties of the GIS/GIL internal insulation, but the current test method for the tensile strength of the interface between the epoxy composite material and aluminum is not perfect, and the samples used in the test There is also no unified standard, which makes it difficult to accurately measure the tensile strength parameter of the interface between epoxy composite materials and metal aluminum.

Contents of the invention

The purpose of the present invention is to provide a test sample for measuring the tensile strength of the interface between epoxy composite material and aluminum, so as to solve the difficulty in accurately measuring the parameter of tensile strength at the interface between epoxy composite material and metal aluminum in the prior art The problem; the present invention also provides a method for measuring the tensile strength of the epoxy composite material and aluminum interface.

In order to achieve the above object, the present invention provides a test sample for measuring the tensile strength of the interface between epoxy composite material and aluminum, comprising a coaxially arranged epoxy composite material structural member, a first aluminum structural member and a second aluminum structural member , one end of the epoxy composite structure is connected to the first aluminum structure by casting, and the other end is connected to the second aluminum structure by casting, and the first aluminum structure is connected to the epoxy composite structure The connecting area of the first aluminum structural member is larger than the connecting area of the second aluminum structural member and the epoxy composite structural member, and the end of the first aluminum structural member far away from the epoxy composite structural member is arranged to be connected with the tensile machine The first connecting structure, the end of the second aluminum structural member away from the epoxy composite structural member is arranged with a second connecting structure for connecting with the tensile machine.

Preferably, both the first aluminum structural member and the second aluminum structural member are cylindrical structures, and the diameter of the first aluminum structural member is larger than the diameter of the second aluminum structural member.

Preferably, a connecting hole is opened at one end of the epoxy composite structural member, and the first aluminum structural member is embedded in the connecting hole.

Preferably, the end surface of the first aluminum structural member embedded in the connection hole is a hemispherical surface, and the bottom of the connection hole is a curved surface adapted to the hemispherical surface.

Preferably, the end surface of the second aluminum structural member and the epoxy composite structural member are planes, and the surface area of the plane is smaller than the surface area of the hemispherical surface.

Preferably, the epoxy composite structural member includes a first cylindrical section, a second cylindrical section and a truncated cone section, the diameter of the first cylindrical section is larger than the diameter of the second cylindrical section, and the truncated circular section is smoothly connected between Between the first cylindrical section and the second cylindrical section, the first aluminum structural member is connected to the first cylindrical section, and the second aluminum structural member is connected to the second cylindrical section.

Preferably, both the first connection structure and the second connection structure are bolt holes.

Preferably, the diameter of the first aluminum structure is defined as D ₁ and the length is H ₁ , the diameter of the first connection structure is defined as D ₂ and the depth is H ₂ , and the diameter of the first cylindrical section is defined as D ₃ , the length is H ₃ , the diameter of the connection hole is defined as D ₄ , the depth is H ₄ , the diameter of the second cylindrical section is defined as D ₅ , and the length is H ₅ , and the second aluminum structural member is defined directly give you D ₆ , length H ₆ , define the diameter of the second connecting structure as D ₇ , depth H ₇ , D ₂ is no more than one-third of D ₁ , H ₁ is greater than D ₁ , H ₂ is not greater than two thirds of D ₂ , D ₄ is equal to D ₁ , H ₄ is not greater than H ₁ , D ₁ is not greater than three quarters of D ₃ , H ₃ is greater than the sum of H ₄ and D _1/2 , D ₅ is not greater than D ₃ /2, H ₅ is greater than H ₃ , the length of the frustum section is not greater than H ₃ , D ₇ is not greater than D ₆ /3, and H ₇ is not greater than H ₆ /3.

The present invention also provides a method for measuring the tensile strength of the epoxy composite material and aluminum interface, which uses the above-mentioned measurement sample of the epoxy composite material and aluminum interface tensile strength, including the following steps, step 1, the The measurement sample is installed on the tension machine, and the first connection structure and the second connection structure are respectively connected to the tension machine; Step 2, the tension machine is used to apply tension to the measurement sample in step 1, and the tension is in steps shape increases; Step 3, when the interface between the epoxy composite structure and the second aluminum structure is destroyed, record the tensile force at this time as F; Step 4, calculate according to the formula M=F/S of tensile strength The tensile strength of the interface between the epoxy composite material and aluminum, where M is the tensile strength, and S is the connection area between the second aluminum structure and the epoxy composite structure.

Preferably, in step 2, the tensile machine gradually increases the tensile force with a step size of 0.5KN, and maintains it for 2 minutes at each step length, and the time for increasing the tension force between different step lengths does not exceed 1 minute.

Compared with the prior art, the sample and method for measuring the tensile strength of the interface between an epoxy composite material and aluminum in the embodiment of the present invention have the beneficial effect that: both the first aluminum structure and the second aluminum structure are compatible with The epoxy composite structural parts are connected by casting and arranged coaxially, simulating the connection mode between epoxy composite material and aluminum in GIL and GIS, which is convenient for tension transmission, and the connection area of the first aluminum structural part and epoxy composite structural part is larger than that of the second The connection area between the second aluminum structural part and the epoxy composite structural part causes the interface between the second aluminum structural part and the epoxy composite structural part to be damaged first, and the tensile strength of the interface between the epoxy composite material and aluminum is tested. During the test, the first aluminum structure is connected to the tensile machine through the first connection structure, the second aluminum structure is connected to the tension machine through the second connection structure, and the measurement sample is stretched by the tension machine, the second aluminum structure Stop the measurement when the interface with epoxy composite structural parts is damaged, and accurately obtain the tensile strength of the interface between epoxy composite material and aluminum according to the tensile force and connection area, improve the accuracy of measurement results, and ensure GIS/GIL insulation The overall performance of the component provides a new test idea.

Description of drawings

Fig. 1 is the structural representation of the measurement sample of epoxy composite material of the present invention and aluminum interface tensile strength;

Fig. 2 is the structural representation of the first aluminum structural part of the measurement sample of the epoxy composite material of Fig. 1 and the aluminum interface tensile strength;

Fig. 3 is a left view of the first aluminum structural member of Fig. 2;

Fig. 4 is the structural representation of the epoxy composite structure of the measurement sample of the epoxy composite material of Fig. 1 and the aluminum interface tensile strength;

Fig. 5 is a left side view of the epoxy composite structure of Fig. 4;

Fig. 6 is the structural representation of the second aluminum structure of the measurement sample of the epoxy composite material and the aluminum interface tensile strength of Fig. 1;

Fig. 7 is a left view of the second aluminum structural member of Fig. 6;

Fig. 8 is a flow chart of the method for measuring the tensile strength of the epoxy composite material and aluminum interface of the present invention.

In the figure, 1. The first aluminum structural part; 11. Hemispherical surface; 2. The second aluminum structural part; 3. The epoxy composite structural part; 31. The first cylindrical section; 32. The second cylindrical section; 33. The circular platform Section; 34, connection hole; 4, bolt hole.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

A preferred embodiment of the measurement sample of the interface tensile strength between epoxy composite material and aluminum of the present invention, as shown in Figure 1 to Figure 7, comprises coaxially arranged epoxy composite material structural member 3, the first The structural part 1 and the second aluminum structural part 2, when the tensile machine applies tensile force to the measurement sample, the coaxial arrangement facilitates the transmission of the tensile force, avoids the distortion of the measurement sample, and improves the accuracy of the test result.

The first aluminum structure part 1 and the second aluminum structure part 2 are arranged at both ends of the length direction of the epoxy composite material, one end of the epoxy composite material structure part 3 is connected to the first aluminum structure part 1 by casting, and the other end is connected to the The pouring connection of aluminum structural part 2 simulates the connection method between epoxy composite material and aluminum in GIL and GIS, and the test results are more accurate.

The connection area between the first aluminum structure 1 and the epoxy composite structure 3 is larger than the connection area between the second aluminum structure 2 and the epoxy composite structure 3, and there is a difference in the connection area. The second aluminum structure 2 and the epoxy The tensile strength between the composite material structural parts 3 is less than the tensile strength between the first aluminum structural part 1 and the epoxy composite material structural part 3, when the tensile machine applies tension to the measurement sample, the second aluminum structural part 2 The interface between the second aluminum structural part 2 and the epoxy composite structural part 3 reaches the maximum tensile strength first and is damaged first, and the measurement is stopped when the interface between the second aluminum structural part 2 and the epoxy composite structural part 3 is damaged. According to the tensile force and The tensile strength of the interface between the epoxy composite material and aluminum can be accurately obtained by using the connection area, which improves the accuracy of the measurement results.

The end of the first aluminum structural member 1 far away from the epoxy composite structural member 3 is arranged with a first connecting structure for connecting with the tensile machine, and the end of the second aluminum structural member 2 far away from the epoxy composite structural member 3 is arranged with a connecting structure for connecting with the tensile machine. The second connection structure of the machine connection. The first connection structure and the second connection structure provide action points for the connection between the tension machine and the measurement sample, so as to facilitate the tension machine to apply tension.

Preferably, both the first aluminum structural part 1 and the second aluminum structural part 2 are cylindrical structures, and the diameter of the first aluminum structural part 1 is larger than the diameter of the second aluminum structural part 2 .

The cylindrical structure facilitates the fabrication and centering of the first aluminum structural part 1 and the second aluminum structural part 2. The axial end faces of the first aluminum structural part 1 and the second aluminum structural part 2 are connected with the epoxy composite structural part 3. The second The centerlines of the first aluminum structural part 1 and the second aluminum structural part 2 are collinear, so that the first aluminum structural part 1 and the second aluminum structural part 2 are coaxially arranged.

The first connection structure is arranged on the centerline of the first aluminum structure 1, and the second connection structure is arranged on the centerline of the first aluminum structure 1, so that the force of the tensile machine on the measurement sample is along the direction of the first aluminum structure. 1. The centerline of the second aluminum structural member 2 extends and is perpendicular to the interface between the epoxy composite material and aluminum.

Preferably, a connecting hole 34 is opened at one end of the epoxy composite structural member 3 , and the first aluminum structural member 1 is embedded in the connecting hole 34 .

The first aluminum structural part 1 is embedded in the connection hole 34, and the end face and side surface of the first aluminum structural part 1 are in contact with the epoxy composite material at the same time, which increases the connection between the first aluminum structural part 1 and the epoxy composite material structural part 3 area, thereby increasing the tensile strength at the interface between the first aluminum structural member 1 and the epoxy composite structural member 3, and preventing the interface between the first aluminum structural member 1 and the epoxy composite structural member 3 from being destroyed .

Preferably, the end surface of the first aluminum structure member 1 embedded in the connecting hole 34 is a hemispherical surface 11 , and the bottom of the connecting hole 34 is a curved surface matching the hemispherical surface 11 .

That is, the first aluminum structural member 1 is an irregular cylinder, the end surface of one end is a hemispherical surface 11, and the other end is a circular plane, the radius of the hemispherical surface 11 is consistent with the radius of the circular plane, and the distance between the two bottom surfaces is the first The length of an aluminum structural member 1 .

Preferably, the end face of the second aluminum structural member 2 and the epoxy composite structural member 3 is a plane, and the surface area of the plane is smaller than the surface area of the hemispherical surface 11 .

The end face of the second aluminum structural member 2 is a plane, because the diameter of the second aluminum structural member 2 is smaller than the diameter of the first aluminum structural member 1, the surface area of the plane is smaller than the surface area of the hemispherical surface 11, so that the second aluminum structural member 2 and epoxy The connection area of the composite structural member 3 is smaller than the connection area of the first aluminum structural member 1 and the epoxy composite structural member 3, so as to ensure that the interface between the second aluminum structural member 2 and the epoxy composite structural member 3 is firstly closed destroy.

Preferably, the epoxy composite structural member 3 includes a first cylindrical section 31, a second cylindrical section 32 and a truncated cone section 33, the diameter of the first cylindrical section 31 is greater than the diameter of the second cylindrical section 32, and the truncated circular section 33 is smoothly connected to the second cylindrical section 32. Between a cylindrical section 31 and a second cylindrical section 32 , the first aluminum structural member 1 is connected to the first cylindrical section 31 , and the second aluminum structural member 2 is connected to the second cylindrical section 32 .

The first cylindrical section 31, the second cylindrical section 32 and the conical frustum section 33 are coaxially arranged, that is, the centerlines of the first cylindrical section 31, the second cylindrical section 32 and the conical frustum section 33 are coincident, and are also connected to the first aluminum structural member 1, The centerlines of the second aluminum structural member 2 coincide, so as to ensure that the first aluminum structural member 1 , the epoxy composite material structural member 3 and the second aluminum structural member 2 are coaxially arranged.

The diameter of the first cylindrical section 31 is greater than the diameter of the first aluminum structural member 1, the diameter of the second cylindrical section 32 is equal to the diameter of the second aluminum structural member 2, the connecting hole 34 is opened on the first cylindrical section 31, and the connecting hole 34 The diameter is equal to the diameter of the first cylindrical section 31, so that the first aluminum structural part 1 is embedded in the epoxy composite structural part 3, and at the same time, the end surface of the second aluminum structural part 2 and the second cylindrical section 32 are tightly connected by casting process.

The smooth transition between the first cylindrical section 31 , the second cylindrical section 32 and the circular frustum section 33 facilitates the manufacture of the epoxy composite structural member 3 and facilitates the transmission of tension in the epoxy composite structural member 3 .

Preferably, both the first connection structure and the second connection structure are bolt holes 4 .

The first connection structure and the second connection structure are used to fix the first aluminum structure 1 and the second aluminum structure 2. The bolt holes 4 are convenient for the tension machine to connect with the first aluminum structure 1 and the second aluminum structure 2, avoiding Fixtures are arranged on the first aluminum structural part 1 and the second aluminum structural part 2, and the assembly is simple.

The bolt hole 4 is opened at the center of the first aluminum structure part 1 and the second aluminum structure part 2, and the bolt hole 4 is coaxially arranged with the first aluminum structure part 1 and the second aluminum structure part 2, so that the pulling force of the tension machine is along the The centerlines of the first aluminum structural part 1, the second aluminum structural part 2 and the epoxy composite structural part 3 are transmitted, and the tension is perpendicular to the interface between the epoxy composite material and aluminum, improving the accuracy of the measurement results.

Preferably, the diameter of the first aluminum structural member 1 is defined as D ₁ and the length is H ₁ , the diameter of the first connection structure is defined as D ₂ and the depth is H ₂ , and the diameter of the first cylindrical segment 31 is defined as D ₃ and the length As H ₃ , define the diameter of the connection hole 34 as D ₄ and the depth as H ₄ , define the diameter of the second cylindrical section 32 as D ₅ and the length as H ₅ , and define the second aluminum structural member 2 as D ₆ , the length is H ₆ , the diameter of the second connecting structure is defined as D ₇ , the depth _is H ₇ , D ₂ is not more than one-third of D 1 , H ₁ is greater than D ₁ , and H ₂ is not greater than one-third of D ₂ Second, D ₄ is equal to D ₁ , H ₄ is not greater than H ₁ , D ₁ is not greater than three quarters of D ₃ , H ₃ is greater than the sum of H ₄ and D ₁ /2, D ₅ is not greater than D ₃ /2, H ₅ is greater than H ₃ , the length of the frustum section 33 is not greater than H ₃ , D ₇ is not greater than D ₆ /3, and H ₇ is not greater than H ₆ /3.

If D ₂ is too large, it will easily cause the strength of the first aluminum structural member 1 to be insufficient, which is not conducive to the measurement of the tensile strength of the test sample; if H ₁ is greater than D ₁ , it ensures that the height of the first aluminum structural member 1 is greater than the diameter, and the purpose is to increase The contact area between the side of the first aluminum structural part 1 and the epoxy composite structural part 3, thereby improving the failure strength of the interface between the first aluminum structural part 1 and the epoxy composite structural part 3; _H2 is about three times that of _H1 Two-thirds, ensure that the bolt hole 4 has a relatively high depth and will not exceed the height range of the first aluminum structural member 1, so as to ensure a better cooperation between the two.

D ₄ =D ₁ , that is, the diameter of the connecting hole 34 is consistent with the diameter of the hemispherical surface 11 of the first aluminum structural member 1, ensuring that the first aluminum structural member 1 can be accurately placed in the connecting hole 34, H ₄ is not greater than H ₁ , ensuring Part of the first aluminum structural member 1 leaked out of the epoxy composite structural member 3 .

D ₁ is not greater than three-quarters of D ₃ , and H ₃ is greater than the sum of H ₄ and D ₁ /2, ensuring that the first aluminum structural member 1 can be placed inside the first cylindrical section 31 and has sufficient contact surface. D ₅ is not greater than D ₃ /2, H ₅ is greater than H ₃ , and during the measurement of the tensile strength of the sample, the interface between the second cylindrical section 32 and the second aluminum structure 2 is the first to break (compared with the first aluminum structure 1 and the interface of epoxy composite structure 3 is more prone to fracture).

The length of the truncated circular segment 33 is not greater than the length of the first cylindrical segment 31 to ensure the structural strength of the epoxy composite structural member 3 . D ₇ is not greater than D ₆ /3, H ₇ is not greater than H ₆ /3, which can ensure that the second aluminum structural member 2 is better fixed without wasting materials.

The embodiment of the method for measuring the tensile strength of the epoxy composite material and the aluminum interface of the present invention, as shown in Figure 8, uses the above-mentioned measurement sample of the epoxy composite material and the aluminum interface tensile strength, comprising the following steps, Step 1: Install the measurement sample on the tensile machine, and connect the first connecting structure and the second connecting structure to the tensile machine respectively.

In this embodiment, the measurement sample is fixed on the tensile machine through the bolt holes 4 on the first aluminum structural member 1 and the bolt holes 4 on the second aluminum structural member 2 to ensure that all parts are rigidly connected and well connected.

In step 2, a tensile force is applied to the measurement sample in step 1 by means of a tensile machine, and the magnitude of the tensile force increases in steps.

The stepwise increase can ensure the orderly increase of the tensile force, avoiding the excessive increase of the tensile force and suddenly exceeding the tensile strength of the measured sample, resulting in sudden destruction of the interface between the second aluminum structure 2 and the epoxy composite structure 3 .

Step 3, when the interface between the epoxy composite structural member 3 and the second aluminum structural member 2 is destroyed, record the tensile force at this time as F.

Step 4, calculate the tensile strength of the interface between the epoxy composite material and aluminum according to the calculation formula M=F/S of the tensile strength, wherein M is the tensile strength, and S is the structure of the second aluminum structure 2 and the epoxy composite material The connecting area between pieces 3.

The tensile strength is equal to the ratio of the tensile force to the area of the interface. In this embodiment, S is the area of the interface between the second aluminum structure 2 and the epoxy composite structure 3, S=πD ₆ ² , so this implementation The tensile strength formula in the example is

In the formula, the unit of F is N, the unit of _D6 is m, and the unit of M is Pa.

Preferably, in step 2, the tensile machine gradually increases the tensile force with a step size of 0.5KN, and maintains it for 2 minutes at each step length, and the time for increasing the tension force between different step lengths does not exceed 1 minute.

In summary, the embodiment of the present invention provides a sample and method for measuring the tensile strength of the interface between epoxy composite material and aluminum, in which the first aluminum structure and the second aluminum structure are cast with the epoxy composite structure Connected and coaxially arranged, simulating the connection method between epoxy composite material and aluminum in GIL and GIS, which is convenient for tension transmission, and at the same time, the connection area between the first aluminum structural part and the epoxy composite structural part is larger than that of the second aluminum structural part and the epoxy composite material The connection area of the composite structural parts, so that the interface between the second aluminum structural part and the epoxy composite structural part is destroyed first. When the tensile strength test is performed on the interface between the epoxy composite material and aluminum, the first aluminum The structural member is connected to the tensile machine through the first connecting structure, the second aluminum structural member is connected to the tensile machine through the second connecting structure, and the measurement sample is stretched through the tensile machine, the second aluminum structural member and the epoxy composite structural member Stop the measurement when the interface of the epoxy composite is damaged, and the tensile strength of the interface between the epoxy composite material and aluminum can be accurately obtained according to the tensile force and the connection area, which improves the accuracy of the measurement results and provides a new way to ensure the overall performance of the GIS/GIL insulation test ideas.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and replacements can also be made, these improvements and replacements It should also be regarded as the protection scope of the present invention.

Claims (10)

1. A sample for measuring the tensile strength of the interface between an epoxy composite material and aluminum, characterized in that it includes a coaxially arranged epoxy composite material structure, a first aluminum structure and a second aluminum structure, the epoxy One end of the composite structural member is connected to the first aluminum structural member by casting, and the other end is connected to the second aluminum structural member by casting, and the connection area between the first aluminum structural member and the epoxy composite structural member is larger than The connection area between the second aluminum structural member and the epoxy composite structural member, the end of the first aluminum structural member far away from the epoxy composite structural member is arranged with a first connection structure for connecting with a tensile machine A second connecting structure for connecting to a tensile machine is arranged at the end of the second aluminum structural member away from the epoxy composite structural member.
2. The sample for measuring the tensile strength of the interface between epoxy composite material and aluminum according to claim 1, wherein the first aluminum structural member and the second aluminum structural member are both cylindrical structures, and the The diameter of the first aluminum structural member is larger than the diameter of the second aluminum structural member.
3. The sample for measuring the tensile strength of the epoxy composite material and aluminum interface according to claim 2, wherein a connection hole is opened at one end of the epoxy composite material structural member, and the first aluminum structural member is embedded installed in the connecting hole.
4. The sample for measuring the tensile strength of the interface between epoxy composite material and aluminum according to claim 3, wherein the end face of one end of the first aluminum structural member embedded in the connection hole is a hemispherical surface, and the The bottom of the connecting hole is a curved surface adapted to the hemispherical surface.
5. The sample for measuring the tensile strength of the epoxy composite material and aluminum interface according to claim 4, wherein the end face of the second aluminum structural member and the epoxy composite structural member is a plane, so The surface area of the plane is smaller than the surface area of the hemisphere.
6. The measurement sample of epoxy composite material and aluminum interface tensile strength according to claim 5, it is characterized in that, described epoxy composite material structural member comprises first cylindrical section, second cylindrical section and conical section, so The diameter of the first cylindrical section is greater than the diameter of the second cylindrical section, the truncated cone section is smoothly connected between the first cylindrical section and the second cylindrical section, and the first aluminum structural member and the The first cylindrical section is connected, and the second aluminum structural member is connected with the second cylindrical section.
7. The measuring sample of epoxy composite material and aluminum interface tensile strength according to claim 6, is characterized in that, described first connection structure, described second connection structure are bolt holes.
8. The sample for measuring the tensile strength of the interface between epoxy composite material and aluminum according to claim 7, wherein the diameter of the first aluminum structure is defined as D ₁ and the length is H ₁ , and the first defined aluminum structure is defined as The diameter of a connecting structure is D ₂ , the depth is H ₂ , the diameter of the first cylindrical section is defined as D 3 , and the length is H ₃ , the diameter of the connecting hole is defined as D ₄ , and the depth is _{H 4 ,} and the defined The diameter of the second cylindrical section is D ₅ , the length is H ₅ , the diameter of the second aluminum structure is defined as D ₆ , and the length is H ₆ , and the diameter of the second connecting structure is defined as D ₇ , The depth is _H7 , _D2 is not more than one-third of _D1 , _H1 is greater than _D1 , _H2 is not greater than two-thirds of _D2 , _D4 is equal to _D1 , _H4 is not greater than _H1 , _D1 Not greater than three quarters of _D3 , _H3 is greater than the sum of _H4 and _D1 /2, _D5 is not greater than _D3 /2, _H5 is greater than _H3 , the length of the frustum section is not greater than _H3 , D ₇ is not greater than D ₆ /3, and H ₇ is not greater than H ₆ /3.
9. A method for measuring the tensile strength of an epoxy composite material and an aluminum interface, characterized in that, using the measurement sample of the epoxy composite material and aluminum interface tensile strength according to claim 1 comprises the following steps, step 1 , the measuring sample is installed on the tensile machine, and the first connecting structure and the second connecting structure are respectively connected to the tensile machine; Step 2, applying a pulling force to the measuring sample in the step 1 by the pulling machine, the pulling force The size increases in steps; Step 3, when the interface between the epoxy composite structural part and the second aluminum structural part is destroyed, record the tensile force at this time as F; Step 4, according to the calculation formula of tensile strength M=F /S calculates the tensile strength of the interface between the epoxy composite and aluminum, where M is the tensile strength, and S is the connection area between the second aluminum structure and the epoxy composite structure.
10. The method for measuring the tensile strength of the interface between epoxy composite material and aluminum according to claim 9, characterized in that, in step 2, the tensile machine gradually increases with the pulling force of 0.5KN as the step size, and keeps 2min, and the tension increment time between different step lengths shall not exceed 1min.

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