Resistance strain type eccentric-eliminating extensometer and use method thereof

Abstract

The invention discloses a resistance strain type eccentric-eliminating extensometer and a use method thereof. The extensometer comprises a three-U-shaped sensor, an auxiliary locating plate and a standard, wherein the three-U-shaped sensor is characterized in that two U-shaped elastomers with clamping cutter points and resistance strain gauges form two independent radial extension sensors; the two independent radial extension sensors and an elastic beam with the resistance strain gauges form a U-shaped eccentric-eliminating axial extension sensor; and the standard is used for calibrating the radial extension sensors. The use method for the extensometer comprises the following steps of: setting the original gauge length of the axial extension sensor by an auxiliary locating plate; installing the three-U-shaped sensor on a tested sample; respectively connecting the resistance strain gauges on the three elastic elements into the resistance strain gauge in a full-bridge mode; when the tested sample is under the axial load action, the axial extension sensor outputs an axial deformation signal in real time; and the two radial extension sensors output the diameter signals of two clamping sections in real time.

Description

technical field [0001] The invention relates to a resistance strain type deeccentric two-dimensional extensometer and a testing method thereof, which are suitable for axial and radial deformation measurement of a circular cross-section sample in a material mechanical property test, and belong to the field of mechanical test technology and sensor technology. Background technique [0002] In the tensile mechanical performance test of materials, it is usually necessary to use an extensometer to measure the deformation of the sample under axial load in real time. Extensometers can be divided into contact and non-contact types. Contact extensometers can be divided into two types: mechanical and electronic. In the normal temperature mechanical performance test, mechanical extensometers have been eliminated. At present, resistance strain electronic extensometers are commonly used. Non-contact extensometers use digital image technology (including different image recognition and tra...

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Problems solved by technology

[0004] For many materials, especially the mechanical performance test of some new materials, it is necessary to measure the axial deformation and lateral deformation of the sample simultaneously, and to measure the cross-sectional size of the sample in real time. At the same time, it is hoped that the measuring instrument system has high resolution and is simple and easy. However, the existing extensometer products cannot meet such requirements

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