Device for testing shearing strain of rectangular truncated pyramid body, and strain state expressing method for device

Abstract

The invention provides a device for testing the shearing strain of a rectangular truncated pyramid body, and a strain state expressing method for the device, and the device comprises a rectangular truncated pyramid body which is formed by the combination of a rectangular pyramid body and a cuboid. The method specifically comprises the steps: selecting one cube as a basic unit, performing the cutting to obtain one rectangular truncated pyramid body, arranging seven rotating angle measurers on the rectangular truncated pyramid body, and obtaining five independent right-angle variation quantities; building an equation relation between a measured sheering strain value and a three-dimensional strain value of one point for an incompressible material according to a theoretical formula of the strain state, thereby providing an expression method of the sheering strain of the strain state for the incompressible material. The beneficial effects of the invention are that a new idea is provided forthe research of the material deformation, and the innovative practice for deepening the research of the deformation characteristics of a material is executed; the theory is clear, the calculation isconvenient, the operation is simple and the precision of a calculation result is high; the method fills a gap that there is no method for expressing the strain state through the sheering strain.

Description

technical field [0001] The invention belongs to the technical field of strain testing in engineering, and specifically relates to a rectangular pyramidal truncated shear strain testing device and a strain state representation method thereof, which are suitable for establishing and testing internal deformation tests of incompressible materials. technical background [0002] The deformation monitoring inside the material has always been a technical difficulty in various engineering projects. Among them, a deep understanding of the basic concept of strain will help people understand the nature and characteristics of material deformation. [0003] The presence of strain is objective, but its description is subjective. Therefore, patent CN104482913A and patent CN106524988A obtain the true strain state at a point based on six mutually independent linear strain values. When describing the properties of materials, there can be different descriptions of the same phenomenon. For ex...

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Problems solved by technology

[0004] However, in actual engineering, the description of strain is very limited. In order to seek a new way of understanding the strain characteristics, a new strain state representation method is needed, that is, the shear strain state test method. Shear strain refers to the stress on an object. When deformation occurs, the degree of deformation at each point in the body is generally different, and the mechanical quantity used to describe the degree of deformation at a point is the strain at that point

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