Double-shaft radial extensometer under high hydraulic environment

Abstract

The invention relates to a dual spindle radial extensometer in high hydraulic pressure environment; four guide holes which are distributed evenly are arranged on a fixed loop, a pressure spring is sheathed on a top material, the screwed end of the top material passes through the guide holes, the two ends of a spring lamination are each provided with a fixing hole and are fixed on the screwed end of two opposite top materials by a retaining nut, the upper and lower surfaces of the top part of the spring lamination are respectively attached with two strain gauges, the four strain gauges form a Wheatstone full bridge, the extensometer is clamped on a cylinder specimen by the pressure spring and the top material, the radial transformation produced by the specimen is transmitted to the spring lamination by the pressure spring and the top material so as to cause the spring lamination to stretch out, the strain gauge measures the strain of the spring lamination, and the transformation of the specimen can be calculated by the output of the Wheatstone full bridge; the invention is applied to measuring the dual spindle radial transformation and strain under high hydraulic pressure, fills the blank of the dual spindle radial transformation and strain measuring technology under high hydraulic pressure, has the advantages of simple structure, convenient use and high measuring precision.

Description

technical field [0001] The invention relates to a radial strain extensometer, in particular to a biaxial radial extensometer in a high hydraulic pressure environment. Background technique [0002] Strain gauges are widely used to measure the deformation of specimens in material performance testing and mechanical testing. Most of the existing strain gauge extensometers are longitudinal extensometers, and they are all limited to use in normal pressure environments. The multiaxial hydrostatic pressure test of porous metal materials needs to measure the radial deformation and strain of the specimen in a high hydraulic pressure environment of 100 MPa. At present, there is no extensometer that can be used to measure the radial or transverse deformation of the specimen in a high hydraulic pressure environment. Contents of the invention [0003] The purpose of the present invention is to fill up the blank of the above-mentioned measurement technology, and provide a radial extensom...

AI Technical Summary

Problems solved by technology

[0002] Strain gauges are widely used in material performance testing and mechanical testing to measure the deformation of specimens. Most of the existing strain gauge extensometers are longitudinal extensometers, and they are all limited to normal pressure environments.

The multiaxial hydrostatic pressure test of porous metal materials needs to measure the radial deformation and strain of the specimen in a high hydraulic pressure environment of 100 MPa. At present, there is no extensometer that can be used to measure the radial or transverse deformation of the specimen in a high hydraulic pressure environment.

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