Test device and test method used for testing three-dimensional strained condition

Abstract

The invention provides a test device used for testing a three-dimensional strained condition. The device structurally comprises 12 strain gauges, wherein an arrangement mode of the 12 strain gauges is that two strain gauges are put into one group, the 12 strain gauges are respectively stuck on six edges of a regular tetrahedron, and the six edges are hinged to form a regular tetrahedron skeleton OABC. Meanwhile, the invention also provides a test method used for testing the three-dimensional strained condition. The test device used for testing the three-dimensional strained condition and the test method used for testing the three-dimensional strained condition provided by the invention have the effects that the device and the test method have the advantages of low price, simple computation method, reasonable construction and convenience in operation. A direct and effective means is provided for better understanding the strained condition and stress condition in a stressed body. A three-dimensional strained rosette is arranged in a material to be tested, and 12 strain values on six edges of the three-dimensional strained rosette are read. According to the measured strain values and a spatial position relationship between the three-dimensional strained rosette and the material to be tested, the magnitude and the direction of the main stress, the maximum shearing strain, the volumetric strain and the generalized shear strain of the object to be tested are calculated according to requirements. The invention fills up a blank in the measurement of the three-dimensional strained condition of an object.

Description

technical field [0001] The invention belongs to the technical field of deformation and strain testing in engineering, in particular to a testing device for testing a three-dimensional strain state and a testing method thereof. The linear strain in six directions obtained through the device and combined with the strain direction, Background technique [0002] The deformation and strain measurement of objects is a basic work in engineering, and it is the prerequisite for quantitative mechanical analysis and engineering safety evaluation, and has an irreplaceable role. Especially in the construction of infrastructure such as civil engineering, water conservancy engineering, and traffic engineering, the general strain state, principal strain, maximum shear strain, volume strain, generalized shear strain, and octahedral strain of materials such as concrete and rock and soil can be accurately obtained. And further calculate the current stress state from the strain state, which is ...

AI Technical Summary

Problems solved by technology

[0005] At present, the main problem in the field of strain testing in engineering is that only the strain and stress data in a certain direction or on a certain plane can be obtained. The conventional right-angle rosette, 45°-3 right-angle rosette, 60°-3 Equiangular strain rosettes can only measure the strain data of a certain plane, but cannot calculate the strain state of a point in three-dimensional space

Currently, 3D strain measurements on objects have not been reported in the literature, however, practical engineering entities are 3D

Therefore, the strain state data obtained by existing testing methods are all one-sided, incomplete and incomplete.

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