Tensile test clamp for high-pressure hydrogen environment material testing machine

Abstract

The invention relates to material mechanical performance testing equipment, and aims to provide a tensile test clamp for a high-pressure hydrogen environment material testing machine. The clamp comprises an upper load transfer frame, a lower load transfer frame, an upper clamp arranged in the upper load transfer frame and a lower clamp arranged in the lower load transfer frame, wherein the upper clamp and the lower clamp respectively comprise a spherical cavity seat and a spherical hinge support seat; each spherical cavity seat is a cylinder with an opening formed in the center; a spherical mold cavity body is inward formed in one end of each cylinder; each spherical hinge support seat comprises a cylinder, a spherical coronal body and a convex part in sequence; the spherical cavity seats and the spherical hinge support seats are positioned in the corresponding load transfer frames; the cylinder of each spherical hinge support seat penetrates through an opening in the center of the spherical cavity seat and a central through hole in the corresponding load transfer frame in sequence and can move freely; the upper clamp and the lower clamp are symmetrical vertically. By utilizing the clamp disclosed by the invention, a sample installation process is rapid, simple and convenient; a sample can be automatically centered in the situations of parallel misalignment, deflection misalignment or mixed misalignment, and the test data accuracy is improved.

Description

technical field [0001] The invention belongs to testing equipment for mechanical properties of materials, in particular to a tensile test jig of a high-pressure hydrogen environment material testing machine. Background technique [0002] The test equipment for mechanical properties of materials under high-pressure hydrogen environment mainly adopts the form of docking the high-pressure hydrogen environment box on the main machine of the existing testing machine. . In order to reduce the amount of hydrogen used, the design space of the high-pressure hydrogen environment box is small, and it is difficult to use hydraulic clamps to hold the sample. If ordinary fixtures connected by threads or bosses are directly used, misalignment is likely to occur, and the additional bending moment on the sample is large, which seriously affects the authenticity of the test results. [0003] The misalignment phenomenon is mainly divided into three categories: 1. Parallel misalignment, that ...

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Problems solved by technology

However, the improved fixtures proposed in these documents are mainly aimed at the misalignment of the deflection angle; for the parallel misalignment or mixed misalignment, it is difficult to achieve automatic alignment; even some structures are too large and complex, the installation requirements are high, and the installation is cumbersome and time-consuming. Not suitable for applications in hydrogen chambers where space is small

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