Acoustic emission probe fixing device and method for measuring circumferential strain of test part

Abstract

The invention discloses an acoustic emission probe fixing device and a method for measuring the circumferential strain of a test part. The device comprises an annular rubber sleeve, a probe fixing seat and an annular strain measuring device, the annular strain measuring device comprises a shell, a main transmission shaft, an auxiliary transmission shaft, a clockwork spring, a dial and a non-elastic steel wire rope, the shell is fixed to the outer side of the annular rubber sleeve, the main transmission shaft is arranged in the shell, and the two ends of the main transmission shaft are movablyconnected with the two side walls of the shell through bearings correspondingly, so that the main transmission shaft can rotate in the shell; the clockwork spring is arranged on the main transmissionshaft and one end of the clockwork spring is fixedly connected with the main transmission shaft; the other end of the clockwork spring is fixedly connected with one end of a non-elastic steel wire rope, and the other end of the non-elastic steel wire rope enters the annular channel from the mounting hole, surrounds the annular channel for a circle and is fixed at the mounting hole. According to the invention, the dependent variable in the mechanical loading process of the test part can be accurately obtained under the condition that the test part has heterogeneity, Meanwhile, the test device is convenient to recycle after the test.

Description

technical field [0001] The invention relates to an acoustic emission probe fixing device and method for measuring circumferential strain of a test piece, belonging to the technical field of rock mechanics experiments. Background technique [0002] Understanding the mechanical properties, deformation and failure laws of rock and rock mass, and various physical and mechanical effects caused by various structures on rock mass are the main sources of engineering design and construction parameters. In order to obtain the degree of influence of the structural characteristics of the rock mass on the mechanical properties of the rock mass, the laboratory gradually adopts the research idea of ​​combining quantitative numerical measurement analysis with the mechanical mechanism of the rock mass. However, in the current test process, the The method of attaching the acoustic emission probe and strain gauge to the surface of the test piece with glue will not only make it difficult to rem...

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Problems solved by technology

In order to obtain the degree of influence of the structural characteristics of the rock mass on the mechanical properties of the rock mass, the laboratory gradually adopts the research idea of ​​combining quantitative numerical measurement analysis with the mechanical mechanism of the rock mass. However, in the current test process, the The method of attaching the acoustic emission probe and strain gauge to the surface of the test piece with glue will not only make it difficult to remove the acoustic emission probe and strain gauge after the test is completed, but also because the test piece itself will have heterogeneity (that is, heterogeneity will lead to different strains at different positions), and the strain gauge can only measure the strain on the part where it fits, which will eventually cause a large experimental error

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