Device for measuring radial deformation of cylindrical test piece

Abstract

The invention discloses a device for measuring radial deformation of a cylindrical test piece. The device comprises a base, a stand column, fastening screws, an annular sensor positioning frame and linear displacement sensors, wherein the stand column is installed on the base, the sensor positioning fame is installed on a sliding guide rail of the stand column through the fastening screws, the linear displacement sensors are installed on the sensor positioning fame, the included angle between the axes of every two linear displacement sensors is 120 degrees, sensor portioning sleeves are installed on the linear displacement sensors, sensor positioning screws are installed between the linear displacement sensors and the sensor portioning sleeves, and the linear displacement sensors are LVDT sensors. The device is simple in structure, convenient to operate and low in cost, and achieves the purpose of measuring radial or transverse strain of the cylindrical test piece; accurate centering can be easily achieved, and the force interaction between the device and the test piece does not exist.

Description

technical field [0001] The present invention relates to the field of material mechanics testing, more specifically to a measuring device for measuring the radial (transverse) deformation of a cylindrical test piece under uniaxial compression conditions, which is suitable for measuring the deformation of a cylindrical test piece under the action of an axial force Radial (lateral) deformation. Background technique [0002] Cylindrical specimens are the standard specimen form in rock mechanics and are common in other materials testing areas as well. The radial (transverse) strain of the specimen is essential for calculating the Poisson's ratio and volumetric strain of the material. Therefore, when performing a uniaxial compression deformation test on a cylindrical specimen, it is not only necessary to measure the axial stress and strain of the specimen, but also to obtain the radial (transverse) deformation of the specimen. [0003] At present, there are three main ways to me...

AI Technical Summary

Problems solved by technology

This method is low in cost and intuitive in principle, but it can only be judged by the naked eye when placing the test piece. It is difficult to ensure that the straight line where the two LVDT sensors are located passes through the center of the section of the test piece, so it is easy to cause measurement errors and cause measurement error cannot be estimated

When using a composite structure, it is necessary to convert the radial displacement into the bending strain or tangential displacement of the cantilever beam through a specific structure, which is relatively complicated and introduces additional system errors

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