Multifunctional shearing test fixture used for composite material parameter identification

Abstract

The invention discloses a multifunctional shearing test fixture used for composite material parameter identification. The multifunctional shearing test fixture comprises an upper fixture body and a lower fixture body, wherein the upper fixture body is connected with a loading part of a testing machine; the lower fixture body is connected with a supporting platform of the testing machine; the upper fixture body is the same as the lower fixture body in structure and in central symmetry with the lower fixture body; each of the upper fixture body and the lower fixture body comprises a connecting piece (1), a clamping piece (5) and a clamping mechanism; the connecting pieces (1) are connected with the testing machine and the clamping pieces (5); each clamping piece (5) is divided into an upper part and a lower part; the upper parts are connected with the connecting pieces (1) and an angle limiting mechanism is arranged at the upper part; the lower parts and the clamping mechanisms are jointly used for clamping a test piece; the clamping mechanisms comprise regulating parts and compressing pieces (6); the compressing pieces (6) are connected with the clamping pieces (5) through an adjusting mechanism; a limiting mechanism is arranged on the clamping piece (5) and used for limiting positions of the compressing pieces to enable the compressing pieces to perform movement along set tracks. The multifunctional shearing test fixture has the advantages of being light in weight, simple in operation and easy to dissemble and capable of realizing pure shear, tension-shear and tension-shear combined loading.

Description

technical field [0001] The invention relates to the field of shear test fixtures, in particular to a multifunctional shear test fixture for composite material parameter identification. Background technique [0002] Generally, if you want to achieve pure bending or pure shear deformation in the plane of the specimen, you often fix one end of the specimen and apply a vertical downward load on the other end of the specimen. The American Society for Testing and Materials (ASTM) standard stipulates that Iosipescu (ie Iosipescu) fixtures are used for shear tests of plates (such as: metals, composite materials, plastics, etc.). The principle of the V-slotted beam shear fixture given in the ASTM standard, the Iosipescu fixture in the standard is composed of three parts: the base, the left clamping module, and the right clamping module. The left clamping module is fixed on the base. During the test The right clamping module moves vertically downward along the guide rail fixed on the...

AI Technical Summary

Problems solved by technology

[0007] 1) The structure is complex and bulky, it is not easy to operate, disassemble, and move, and it has high requirements for the installation and processing of the guide rail;

[0008] 2) It is difficult to obtain accurate load information using the current fixture;

[0009] 3) The function is single, the loading mode is single, and the application in the field of mechanical inverse problems has great limitations

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