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Rotary right angle tetrahedron-based test device for shearing strain and calculating method thereof

A test device, tetrahedron technology, applied in the direction of measuring devices, instruments, etc., to achieve the effect of major innovation, significant significance, and ingenious device structure

Pending Publication Date: 2019-01-08
TIANJIN CHENGJIAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, there is no relevant literature available for the device and corresponding calculation method to describe the three-dimensional strain state of a point with independent shear strain.

Method used

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  • Rotary right angle tetrahedron-based test device for shearing strain and calculating method thereof
  • Rotary right angle tetrahedron-based test device for shearing strain and calculating method thereof
  • Rotary right angle tetrahedron-based test device for shearing strain and calculating method thereof

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Embodiment Construction

[0017] A test device and calculation method for shear strain based on a rotating right-angled tetrahedron of the present invention are described in conjunction with the accompanying drawings.

[0018] like Figure 1 to Figure 6 As shown, a test device based on the shear strain of a rotating tetrahedron, comprising: a rotating rectangular tetrahedron 1, a rotation angle measuring device 2, a water-tight sealant 3 and a data wire 4, the rotating rectangular tetrahedron 1 is in a cube unit After cutting the profile above, combine the two right-angled tetrahedrons before and after cutting to form an equal body with a common vertex, six protruding edges and 12 cutting surfaces, and you can get the right-angled tetrahedron of rotation 1; Angle measuring devices 2 are provided on the edges, and are fixed on the rotating rectangular tetrahedron 1 with impermeable sealant 3; the data measured by the angle measuring devices 2 are transmitted to the data acquisition system through the da...

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Abstract

The invention provides a rotary right angle tetrahedron-based test device for a shearing strain and a strain state calculating method thereof. The device comprises a rotary right angle tetrahedron structure and rotating angle measurers. A shearing strain value is measured by measuring a corresponding right angle variation, so as to obtain a strain value of one point inside an incompressible material. Meanwhile, the invention provides a shearing strain calculating method based on a strain state of the rotary right angle tetrahedron structure. A calculating formula where a three-dimensional strain state of one point can be linearly expressed by several characteristic shearing strains is built, so that single expression of the shearing strain for the strain state is realized. The device and the method have the beneficial effects that internal characteristics of the incompressible material are reflected; a novel measure is provided for learning the yield of the material and building the model; in order to learn the strain and the stress in the incompressible material better, a direct and effective measure is provided; and the blank of calculating the three-dimensional strain state by the shearing strain is filled.

Description

technical field [0001] The invention belongs to the technical field of deformation and strain testing in engineering, and in particular relates to a testing device and a calculation method based on a rotating rectangular tetrahedral shear strain. The device measures the values ​​of five shear strains inside an incompressible material, and further obtains The three-dimensional strain state at a point inside an incompressible material. technical background [0002] The deformation and strain testing technology in engineering, the test results are often one-way, one-dimensional, so the real-time deformation monitoring, displacement monitoring, slope stability monitoring, etc. inside the material have always been the safety evaluation of various engineering projects. the key of. [0003] The monitoring of disasters such as collapse and instability in various projects is mostly measured by arranging strain gauges and stress gauges. Therefore, based on the theory that the three-...

Claims

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Application Information

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IPC IPC(8): G01B21/32
CPCG01B21/32
Inventor 李顺群刘烨璇张翻程宇白云凤郭林坪夏锦红赵磊
Owner TIANJIN CHENGJIAN UNIV
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