Three-dimensional stress testing device and method suitable for axisymmetric stress condition

Abstract

The invention provides a three-dimensional stress testing device suitable for an axisymmetric stress condition. The three-dimensional stress testing device comprises a polyhedron base suitable for theaxisymmetric stress condition, a plurality of soil pressure boxes, testing equipment and a plurality of data wires. The polyhedron base suitable for the axial symmetry stress condition is mainly composed of seven grooves formed in the surfaces with mutually independent normal vectors and eleven wire holes; and the seven grooves comprise five grooves where soil pressure boxes need to be arranged and two standby grooves, the eleven wire holes are used for connecting data wires with a test system, and the like. The invention further provides a using method for testing the three-dimensional stress state in the material under the axial symmetry stress condition. The testing device and method have the beneficial effects of meeting the requirement of axisymmetric engineering, and being simple instructure, small in size and low in cost; the use process is simple and easy to operate, and large-area popularization is facilitated; the three-dimensional stress state precision in the test material can be improved, the change condition of the stress in each direction in the material can be more objectively detected, and a reliable basis is provided for the safety guarantee of actual engineering.

Description

technical field [0001] The invention belongs to the field of stress testing, in particular to a three-dimensional stress testing device and testing method suitable for axisymmetric stress conditions. It can more accurately detect the change trend of the three-dimensional stress inside the material under the axisymmetric condition, and provide a reliable basis and reference for the safety guarantee of the actual project. Background technique [0002] In recent years, the research on the internal stress state of materials in experiments or practical engineering has always attracted the attention of many scholars. The stress testing technology inside the material has gradually developed from the one-dimensional level to the two-dimensional level, and mainly focuses on one-way detection. For example, when the traditional pressure sensor detects the internal stress change of the material, it usually relies on the direct deformation of the strain gauge caused by the force, and co...

AI Technical Summary

Problems solved by technology

Patent 201910201996.5 discloses a three-dimensional stress test device and test method based on a new polyhedron base, but the device does not consider the sudden situation of damage to two earth pressure cells when the problem of axisymmetric

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