Clamp for compact tension specimen of material testing machine under high pressure hydrogen environment

Abstract

The invention belongs to material mechanics property testing equipment, and provides a clamp for a compact tension specimen of a material testing machine under a high pressure hydrogen environment. The clamp comprises an upper clamp and a lower clamp, the upper clamp comprises an upper support, an upper primary U-shaped clamp, an upper secondary U-shaped clamp and dowels. The two ends of the upper support (the periphery of a cylindrical part) are respectively provided with a screw hole and are connected with the upper end of the testing machine through screws, two opposite rectangular blocks in the middle part of the upper support constitute a clamping interval, the two rectangular blocks and the cylindrical part of the upper support are machined to be of an integrated structure, and all the above components belong to the support part. The clamp for the compact tension specimen of the material testing machine under the high pressure hydrogen environment has the advantages that the misalignment influence can be eliminated automatically in the testing process of the compact tension specimen, it is guaranteed that the compact tension specimen is only subjected to the one-way loading action, the additional bending moment can be avoided, hence, the accuracy of test data is improved, using is simple and convenient, and the clamp is particularly suitable for material compact tension tests under the high pressure hydrogen environment.

Description

technical field [0001] The invention belongs to testing equipment for mechanical properties of materials, in particular to a fixture for a compact tensile sample of a high-pressure hydrogen environment material testing machine. Background technique [0002] The test equipment for fracture toughness test or fatigue crack growth rate test of materials under high-pressure hydrogen environment mainly connects the existing test machine host with the high-pressure hydrogen environment box, installs the compact tensile sample in the high-pressure hydrogen environment box, and then passes through the test machine host Load the sample to obtain the fracture mechanical properties of the material such as fracture toughness or fatigue crack growth rate in a hydrogen environment. The special hydrogen test environment puts forward higher requirements on the clamps for compact tensile specimens. In order to reduce the amount of hydrogen used, the design space of the high-pressure hydrogen ...

AI Technical Summary

Problems solved by technology

For example, the ordinary U-shaped fixture directly connected by thread is prone to misalignment, and the operation is difficult, resulting in a large additional bending moment on the sample, which seriously affects the authenticity of the test results.

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