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Three-dimensional cross-shaped biaxial tension test piece

A two-way stretching, three-dimensional cross technology, used in measuring devices, instruments, scientific instruments, etc., can solve the problems of inability to achieve large deformation and uneven force in the central area.

Inactive Publication Date: 2010-11-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a three-dimensional cross-shaped bidirectional tensile test piece to solve the problems of uneven stress in the central area of ​​the existing cross-shaped test piece and the inability to achieve large deformation.

Method used

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  • Three-dimensional cross-shaped biaxial tension test piece

Examples

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specific Embodiment approach 1

[0007] Specific implementation mode one: combine Figure 1 ~ Figure 2 Describe this embodiment, this embodiment is made up of a cross-shaped drawing member 1, and the end surface of the junction of every two adjacent arms among the four arms 1-1 on the cross-shaped drawing member 1 is provided with a pit 1- 2. The four dimples 1-2 are located on the same side of the cross-shaped tensile member 1 . When the pits 1-2 at the rounded corners between the arms are subjected to external force, the geometric deformation is much greater than the plastic deformation; as the bidirectional tensile stress of the specimen increases, the deformation of the central area also begins to increase, and the pits Part 1-2 undergoes greater geometric deformation, and may even be completely flattened in the end, resulting in significant shape deformation. This geometric deformation process alleviates most of the original stress concentration effect, so that the tensile stress on the cross-shaped arm...

specific Embodiment approach 2

[0008] Specific implementation mode two: combination figure 1 and figure 2 To illustrate this embodiment, the cross-sectional shape of each dimple 1-2 in this embodiment along the bisector of the angle between its two adjacent arms is a quarter ellipse or a quarter arc. The shape of the pit 1-2 is selected according to the ratio of the two-way load on the cross-shaped tensile member 1 . Other compositions are the same as in Embodiment 1.

specific Embodiment approach 3

[0009] Specific implementation mode three: combination figure 1 To describe this embodiment, the wall thickness of each arm 1-1 of the cross-shaped tensile member 1 of this embodiment is provided with a long hole 1-1-1. The long hole 1-1-1 can relieve the stress concentration in the central area, making the stress distribution in the central area more uniform. Other compositions are the same as in Embodiment 1.

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Abstract

The invention provides a three-dimensional cross-shaped biaxial tension test piece. The invention relates to a biaxial tension test piece. The invention solves the problems that stress at the center of the existing cross-shaped test piece is nonuniform and large deformation can not be achieved. The invention is composed of one cross-shaped tension piece (1), the end face at the junction of each two adjacent arms of the four arms (1-1) on the cross-shaped tension piece (1) is provided with a pit (1-2), and the four pits (1-2) are arranged on the same side of the cross-shaped tension piece (1). The invention is used for providing a biaxial tension test piece, so as to test the biaxial tension property of plate and obtain accurate material model.

Description

technical field [0001] The invention relates to a biaxial tensile test piece. Background technique [0002] Most space containers in the aerospace field are two-way force-bearing structures, such as spherical containers and thin-walled cylindrical parts. In order to solve its structural and performance problems, since the 1940s, more and more people have devoted themselves to bidirectional tensile tests. The structural shape of the biaxial tensile specimen is directly related to the feasibility and accuracy of the test. At present, biaxial tensile test pieces include wide plate type, punching model, bulging type and cross type, etc. Obviously, the cross type test piece is the most intuitive, but the following problems exist in the cross type test piece: (1) The maximum deformation occurs in the central area, That is, necking or cracking occurs in the central area; (2) There is shear stress on the main plane of the central area of ​​the specimen, and the distribution of axi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/02
Inventor 单德彬孙圣迪陈勇徐文臣郭斌
Owner HARBIN INST OF TECH
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