Test fixture for stress test

Abstract

The utility model relates to the technical field of mechanical property testing devices, and particularly discloses a test fixture for stress testing, which comprises a first adapter sleeve, a first hemispherical mounting piece, a second adapter sleeve and a second hemispherical mounting piece. The first hemispherical mounting piece and the second hemispherical mounting piece are both arranged to be hemispherical, the size of the first hemispherical cavity is matched with the size of the first hemispherical mounting piece, and the size of the second hemispherical cavity is matched with the size of the second hemispherical mounting piece. Compared with the prior art in which a U-shaped opening test fixture is adopted, the test fixture for stress test has the advantages that additional bending stress is effectively prevented from being added in the loading process, and the test fixture is simple in structure, convenient to operate and high in test efficiency. Therefore, the actual test force value is larger than the set value, and the test is easy to be invalid.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanics performance testing device technical field especially relates to a test fixture for stress test. BACKGROUND

[0002] At present, metal material test experiment (or hydrogen embrittlement loading experiment) is mainly realized through (high temperature) creep test testing machine. Among them, through the test fixture designed, the sample meeting the requirements is hung in the axial space of the testing machine, a certain load is applied and kept for a certain time, so as to verify the compliance of the sample or processing technology; and in order to ensure the standardization and effectiveness of the test, the coaxiality of the testing machine and the sample loading needs to be ensured, the U-shaped test fixture is used in the prior art, which will cause the coaxiality of the sample clamping to be abnormal, that is, an additional bending stress will be increased in the loading process, so that the actual test force value is larger than the set value, thus causing the test invalid. SUMMARY

[0003] The utility model discloses a test fixture for stress test, which solves the problem of poor coaxiality of the test fixture in the prior art and the invalid test.

[0004] In order to solve the above problems, the utility model provides a test fixture for stress test, which comprises: a first adapter sleeve having a first installation cavity and a first hemispherical cavity which are coaxially arranged and communicated with each other, and the first adapter sleeve can be connected with one end of a testing machine; a first hemispherical mounting piece is installed in the first hemispherical cavity and is limitedly matched with the first hemispherical cavity in the axial direction of the first adapter sleeve, the size of the first hemispherical cavity matches the size of the first hemispherical mounting piece, the radial size of the first installation cavity is greater than the diameter of the first hemispherical mounting piece, and the first hemispherical mounting piece is used for clamping one end of a first test piece; a second adapter sleeve has a second installation cavity and a second hemispherical cavity which are coaxially arranged and communicated with each other, and the second adapter sleeve can be connected with the other end of the testing machine; a second hemispherical mounting piece is installed in the second hemispherical cavity and is limitedly matched with the first hemispherical cavity in the axial direction of the second adapter sleeve, the size of the second hemispherical cavity matches the size of the second hemispherical mounting piece, the radial size of the second installation cavity is greater than the diameter of the second hemispherical mounting piece, and the second hemispherical mounting piece is used for clamping the other end of the first test piece.

[0005] As an optional technical solution of the test fixture for stress test, the first hemispherical mounting piece has an assembly hole which is arranged through in the axial direction of the first adapter sleeve, one end of the first test piece passes through the assembly hole and abuts against the end face of the first hemispherical mounting piece.

[0006] As an optional technical solution of the test fixture for stress testing, the first test piece to be tested has a limiting protrusion, and the limiting protrusion is in abutment with an end face of the first hemispherical mounting.

[0007] As an optional technical solution of the test fixture for stress testing, the assembly hole is provided with a chamfer.

[0008] As an optional technical solution of the test fixture for stress testing, the first hemispherical mounting comprises two quarter-spheres spliced together, one of the quarter-spheres has a first through hole, and the other quarter-sphere has a second through hole, the first through hole and the second through hole form the assembly hole, and the outer walls of the two quarter-spheres are in abutment with the inner wall of the first hemispherical cavity.

[0009] As an optional technical solution of the test fixture for stress testing, one of the two quarter-spheres has a positioning hole, and the other has a positioning column which is inserted into the positioning hole.

[0010] As an optional technical solution of the test fixture for stress testing, the positioning hole and the positioning column are both multiple, and the multiple positioning holes and the multiple positioning columns are one-to-one correspondingly arranged.

[0011] As an optional technical solution of the test fixture for stress testing, the first mounting cavity and the second mounting cavity are both cylindrical, the diameter of the first mounting cavity is the same as the diameter of the first hemispherical cavity, and the diameter of the second mounting cavity is the same as the diameter of the second hemispherical cavity.

[0012] As an optional technical solution of the test fixture for stress testing, the test fixture for stress testing further comprises an adapter fixture, the adapter fixture comprises a first adapter connecting sleeve, a first adapter connecting sleeve, a first adapter hemispherical mounting, a second adapter hemispherical mounting and a second test piece to be tested, the first adapter hemispherical mounting is mounted in the first adapter connecting sleeve and can clamp the other end of the first test piece to be tested, the second adapter hemispherical mounting is mounted in the second adapter connecting sleeve and can clamp one end of the second test piece to be tested, and the second hemispherical mounting can clamp the other end of the second test piece to be tested.

[0013] As an optional technical solution of the test fixture for stress testing, the adapter fixture is multiple.

[0014] The test fixture for stress testing has the advantages that:

[0015] The utility model provides a test fixture for stress test, this test fixture for stress test includes first adapter sleeve, first hemispherical mounting piece, second adapter sleeve and second hemispherical mounting piece. Among them, first adapter sleeve has the first installation cavity and first hemispherical cavity of intercommunication and coaxial arrangement, second adapter sleeve has the second installation cavity and second hemispherical cavity of intercommunication and coaxial arrangement. The utility model provides a test fixture for stress test, installs first hemispherical mounting piece in first hemispherical cavity, and second hemispherical mounting piece is installed in second hemispherical cavity, realizes the purpose of clamping two ends of first test piece to be tested through first hemispherical mounting piece cooperation first adapter sleeve and second hemispherical mounting piece cooperation second adapter sleeve, at the same time, the shape of first hemispherical mounting piece and second hemispherical mounting piece is all set into hemispherical, and the size of first hemispherical cavity is matched with the size of first hemispherical mounting piece, the size of second hemispherical cavity is matched with the size of second hemispherical mounting piece, such cooperation mode makes first hemispherical mounting piece and first hemispherical cavity can be completely attached, second hemispherical mounting piece and second hemispherical cavity can be completely attached, effectively guarantee the coaxiality of first test piece to be tested and first adapter sleeve, second adapter sleeve after clamping, compared with the mode of U type mouth test fixture in prior art, the test fixture for stress test of the scheme effectively avoids an additional bending stress in the loading process, so that the actual test force value is larger than the set value, and it is easy to cause the invalid test. The test fixture for stress test of the utility model effectively solves the coaxiality difference of test fixture in prior art, and the problem of invalid test. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structure schematic drawing of test fixture for stress test in the utility model embodiment;

[0017] Figure 2 It is the explosion map of first hemispherical mounting piece in the utility model embodiment;

[0018] Figure 3 It is the explosion map of first hemispherical mounting piece, first test piece to be tested and second hemispherical mounting piece in the utility model embodiment;

[0019] Figure 4 It is the schematic drawing of part structure of test fixture for stress test in the utility model embodiment.

[0020] In the drawing:

[0021] 1, first adapter sleeve;11, first installation cavity;12, first hemispherical cavity;

[0022] 2, first semi-spherical mounting; 21, assembly hole; 211, chamfer; 22, quarter ball; 221, positioning hole; 222, positioning column;

[0023] 3, second adapter sleeve;

[0024] 4, second semi-spherical mounting;

[0025] 5, first test specimen; 51, limiting protrusion;

[0026] 6, adapter clamp; 61, first adapter connecting sleeve; 62, second adapter connecting sleeve;

[0027] 7, second test specimen;

[0028] 8, first threaded connecting rod;

[0029] 9, second threaded connecting rod. DETAILED DESCRIPTION

[0030] The technical scheme of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0031] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the "above", "above" and "above" of the first feature on the second feature include the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature on the second feature include the first feature below and obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0032] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be two elements inside the communication.For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0033] The embodiments of the utility model are described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.

[0034] As Figures 1 to 4 The utility model provides a test fixture for stress test, the test fixture for stress test includes first adapter sleeve 1, first hemispherical mounting 2, second adapter sleeve 3 and second hemispherical mounting 4, wherein first adapter sleeve 1 has first installation cavity 11 and first hemispherical cavity 12 that are coaxially arranged and are communicated with each other, and first adapter sleeve 1 can be connected with one end of testing machine;First hemispherical mounting 2 is installed in first hemispherical cavity 12, and is limitedly matched with first hemispherical cavity 12 in the axial direction of first adapter sleeve 1, the size of first hemispherical cavity 12 is matched with the size of first hemispherical mounting 2, the radial dimension of first installation cavity 11 is greater than the diameter of first hemispherical mounting 2, and first hemispherical mounting 2 is used to clamp one end of first test piece 5 to be tested;Second adapter sleeve 3 has second installation cavity and second hemispherical cavity that are coaxially arranged and are communicated with each other, and second adapter sleeve 3 can be connected with the other end of testing machine;Second hemispherical mounting 4 is installed in second hemispherical cavity, and is limitedly matched with first hemispherical cavity 12 in the axial direction of second adapter sleeve 3, the size of second hemispherical cavity is matched with the size of second hemispherical mounting 4, the radial dimension of second installation cavity is greater than the diameter of second hemispherical mounting 4, and second hemispherical mounting 4 is used to clamp the other end of first test piece 5 to be tested.

[0035] The utility model provides a test fixture for stress test, install first hemispherical mounting piece 2 in first hemispherical cavity 12, and install second hemispherical mounting piece 4 in second hemispherical cavity, realize the purpose of clamping the both ends of first test piece 5 for testing through first hemispherical mounting piece 2 cooperation first adapter sleeve 1 and second hemispherical mounting piece 4 cooperation second adapter sleeve 3, the shape of first hemispherical mounting piece 2 and second hemispherical mounting piece 4 is all set into hemispherical, and the size of first hemispherical cavity 12 is matched with the size of first hemispherical mounting piece 2, the size of second hemispherical cavity is matched with the size of second hemispherical mounting piece 4, and this cooperation mode makes first hemispherical mounting piece 2 and first hemispherical cavity 12 can be completely attached, second hemispherical mounting piece 4 and second hemispherical cavity can be completely attached, effectively guarantee the coaxiality of first test piece 5 for testing, first adapter sleeve 1 and second adapter sleeve 3 after clamping, compared with the mode of U type mouth test fixture in prior art, the test fixture for stress test of the scheme effectively avoids the increase of an additional bending stress in the loading process, so that the actual test force value is larger than the set value, and it is easy to cause the invalid test. The test fixture for stress test of the utility model effectively solves the coaxiality difference of the test fixture in prior art, and solves the problem of invalid test.

[0036] Wherein, the first installation cavity 11 and the first hemispherical cavity 12 are coaxially arranged, and the second installation cavity and the second hemispherical cavity are coaxially arranged, which can also improve the coaxiality of the first test piece 5 for testing, the first adapter sleeve 1 and the second adapter sleeve 3 after clamping.

[0037] Optionally, the test fixture for stress test further comprises a first threaded connecting rod 8 and a second threaded connecting rod 9, one end of the first threaded connecting rod 8 is threadedly connected with the inner wall of the first installation cavity 11, and the other end of the first threaded connecting rod 8 is connectable with one end of a testing machine; one end of the second threaded connecting rod 9 is threadedly connected with the inner wall of the second installation cavity, and the other end of the second threaded connecting rod 9 is connectable with the other end of the testing machine.

[0038] In some embodiments, as shown in Figure 2 The first hemispherical mounting piece 2 has an assembly hole 21. Wherein, the assembly hole 21 is arranged through in the axial direction of the first adapter sleeve 1, one end of the first test piece 5 for testing is passed through the assembly hole 21, the assembly hole 21 can limit the first test piece 5 for testing in the radial direction of the first adapter sleeve 1, and one end of the first test piece 5 for testing abuts against the end face of the first hemispherical mounting piece 2, which ensures that the first test piece 5 for testing is limited in the axial direction of the first adapter sleeve 1, thereby achieving the purpose of clamping one end of the first test piece 5 for testing.

[0039] Specifically, the first test piece 5 has a limiting protrusion 51, and the limiting protrusion 51 is in abutment with the end face of the first half-spherical mounting member 2. The limiting protrusion 51 can limit the first test piece 5 in the axial direction of the first adapter sleeve 1.

[0040] As shown in Figure 2 The assembly hole 21 is provided with a chamfer 211. In this way, the first test piece 5 can be assembled conveniently.

[0041] In this embodiment, the first half-spherical mounting member 2 includes two quarter-spheres 22 that are spliced together. One of the quarter-spheres 22 has a first through hole, and the other quarter-sphere 22 has a second through hole. After splicing, the first through hole and the second through hole form the assembly hole 21. The outer walls of the two quarter-spheres 22 are in contact with the inner walls of the first half-spherical cavity 12, so as to ensure the coaxiality of the first test piece 5, the first adapter sleeve 1 and the second adapter sleeve 3 after clamping.

[0042] Further, one of the two quarter-spheres 22 has a positioning hole 221, and the other has a positioning column 222 that is inserted into the positioning hole 221. In this way, the two quarter-spheres 22 can be positioned conveniently when spliced, thereby improving the assembly efficiency.

[0043] In some embodiments, the positioning hole 221 and the positioning column 222 are both provided in multiple numbers. The multiple positioning holes 221 and the multiple positioning columns 222 are provided in one-to-one correspondence. In this way, the structural strength of the two quarter-spheres 22 after splicing can be ensured.

[0044] Specifically, the first mounting cavity 11 and the second mounting cavity are both cylindrical, which facilitates the matching with the shape of the first half-spherical mounting member 2 and facilitates the mounting. The diameter of the first mounting cavity 11 is the same as the diameter of the first half-spherical cavity 12, and the diameter of the second mounting cavity is the same as the diameter of the second half-spherical cavity, thereby facilitating the smooth mounting of the first half-spherical mounting member 2 and the second half-spherical mounting member 4. The structure of the second half-spherical mounting member 4 is the same as that of the first half-spherical mounting member 2.

[0045] Specifically, as shown in Figure 1As shown, in order to improve the test efficiency of the test piece to be tested, the test fixture for stress test further comprises an adapter fixture 6. The adapter fixture 6 comprises a first adapter connecting sleeve 61, a second adapter connecting sleeve 62, a first adapter semi-spherical mounting member, a second adapter semi-spherical mounting member and a second test piece 7 to be tested. The first adapter semi-spherical mounting member is mounted in the first adapter connecting sleeve 61 and can clamp the other end of the first test piece 5 to be tested. The second adapter semi-spherical mounting member is mounted in the second adapter connecting sleeve 62 and can clamp one end of the second test piece 7 to be tested. The second semi-spherical mounting member 4 can clamp the other end of the second test piece 7 to be tested. In this way, the test of the first test piece 5 to be tested and the second test piece 7 to be tested can be realized while the coaxiality is ensured, and the test efficiency is improved. The structure of the first adapter connecting sleeve 61, the structure of the second adapter connecting sleeve 62 and the structure of the first adapter sleeve 1 are the same. The structure of the first adapter semi-spherical mounting member, the structure of the second adapter semi-spherical mounting member and the structure of the first semi-spherical mounting member 2 are the same.

[0046] Optionally, the adapter fixture 6 can be a plurality of adapters connected in series. In this way, the test efficiency is further improved. The number of adapter fixtures 6 can be selected according to the clamping space of the testing machine, so as to maximize the utilization of the testing machine.

[0047] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, other different forms of changes or modifications can be made on the basis of the above description. Here, all the embodiments are not required to be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A test fixture for stress testing, characterized by, include: The first adapter sleeve (1) has a first mounting cavity (11) and a first hemispherical cavity (12) that are interconnected and coaxially arranged. The first adapter sleeve (1) can be connected to one end of the testing machine. The first hemispherical mounting part (2) is installed in the first hemispherical cavity (12) and is limited to the first hemispherical cavity (12) in the axial direction of the first adapter sleeve (1). The size of the first hemispherical cavity (12) matches the size of the first hemispherical mounting part (2). The radial dimension of the first mounting cavity (11) is greater than the diameter of the first hemispherical mounting part (2). The first hemispherical mounting part (2) is used to clamp one end of the first test specimen (5). The second adapter sleeve (3) has a second mounting cavity and a second hemispherical cavity that are interconnected and coaxially arranged. The second adapter sleeve (3) can be connected to the other end of the testing machine. The second hemispherical mounting part (4) is installed in the second hemispherical cavity and is limited to the first hemispherical cavity (12) in the axial direction of the second adapter sleeve (3). The size of the second hemispherical cavity matches the size of the second hemispherical mounting part (4). The radial dimension of the second mounting cavity is greater than the diameter of the second hemispherical mounting part (4). The second hemispherical mounting part (4) is used to clamp the other end of the first test specimen (5).

2. The test fixture for stress testing of claim 1, wherein, The first hemispherical mounting component (2) has an assembly hole (21) which is provided through the first adapter sleeve (1) in the axial direction. One end of the first test piece (5) passes through the assembly hole (21) and abuts against the end face of the first hemispherical mounting component (2).

3. The test fixture for stress testing of claim 2, wherein, The first test specimen (5) has a limiting protrusion (51) that abuts against the end face of the first hemispherical mounting piece (2).

4. The test fixture for stress testing of claim 2, wherein, The assembly hole (21) is chamfered (211).

5. The test fixture for stress testing of claim 2, wherein, The first hemispherical mounting component (2) includes two quarter-spheres (22) joined together. One quarter-sphere (22) has a first through hole, and the other quarter-sphere (22) has a second through hole. The first through hole and the second through hole form the assembly hole (21). The outer walls of the two quarter-spheres (22) are in contact with the inner wall of the first hemispherical cavity (12).

6. The test fixture for stress testing of claim 5, wherein, One of the two quarter-spheres (22) has a positioning hole (221) and the other has a positioning post (222) inserted into the positioning hole (221).

7. The test fixture for stress testing of claim 6, wherein, There are multiple positioning holes (221) and multiple positioning posts (222), and the multiple positioning holes (221) and multiple positioning posts (222) are arranged in a one-to-one correspondence.

8. The test fixture for stress testing of claim 1, wherein, Both the first mounting cavity (11) and the second mounting cavity are cylindrical. The diameter of the first mounting cavity (11) is the same as the diameter of the first hemispherical cavity (12), and the diameter of the second mounting cavity is the same as the diameter of the second hemispherical cavity.

9. The test fixture for stress testing of claim 1, wherein, The test fixture for stress testing further comprises an adapter fixture (6), the adapter fixture (6) comprising a first adapter connecting sleeve (61), a second adapter connecting sleeve (62), a first adapter semi-spherical mounting member, a second adapter semi-spherical mounting member, and a second to-be-tested test piece (7), the first adapter semi-spherical mounting member being mounted in the first adapter connecting sleeve (61) and capable of clamping the other end of the first to-be-tested test piece (5), the second adapter semi-spherical mounting member being mounted in the second adapter connecting sleeve (62) and capable of clamping one end of the second to-be-tested test piece (7), and the second semi-spherical mounting member (4) being capable of clamping the other end of the second to-be-tested test piece (7).

10. The test fixture for stress testing of claim 9, wherein, The adapter fixture (6) is multiple.

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