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A method for obtaining composite deformation of sheet metal in tension and shear by uniaxial stretching

A technology of uniaxial stretching and sheet metal, which is applied in the field of measurement, can solve problems from deformation to sample destruction, and achieve the effects of uniform deformation, simple sample design, and easy control

Active Publication Date: 2020-11-13
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the problems existing in the current tension-shear composite deformation test, the purpose of the present invention is to propose a method for obtaining the tension-shear composite deformation of metal sheets by uniaxial stretching, which can obtain the composite tension-shear deformation of metal sheets by uniaxial stretching, and the deformation path Keep linear and have enough uniform deformation area, you can get a large amount of deformation (can be deformed to the failure of the sample), used to prepare to characterize the mechanics and failure behavior of the sheet metal tension-shear composite deformation path

Method used

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  • A method for obtaining composite deformation of sheet metal in tension and shear by uniaxial stretching
  • A method for obtaining composite deformation of sheet metal in tension and shear by uniaxial stretching
  • A method for obtaining composite deformation of sheet metal in tension and shear by uniaxial stretching

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Embodiment 1

[0047] Figure 4(a)-Figure 4(c) It is the sample size of this embodiment. As can be seen from the figure, the thickness of the metal plate adopted in this embodiment is 1.5mm, the arc notch fillet radius r=4mm, the central deformation area size (diameter W=10mm, transition fillet radius R=11.4mm, thickness t= 0.4mm).

[0048] The basic process of the present embodiment (scheme 1) is as follows:

[0049] (1) Processing of tensile and shear deformation samples. The arc-shaped notch fillet of the sample is processed by wire cutting, and the deformation area is processed by electric discharge, which can effectively guarantee the fillet and wall thickness accuracy.

[0050] (2) Measurement and calibration of tensile and shear deformation specimens. Randomly distributed speckles are formed by spraying paint on the surface of the sample observation area and dried.

[0051] (3) Unidirectional tensile test. The sample was clamped by a tensile testing machine equipped with digital...

Embodiment 2

[0054] The differences between this embodiment (scheme 2) and embodiment 1 are:

[0055] Difference 1: In this embodiment, if Figure 4(d)-Figure 4(f) As shown, the sample arc notch fillet radius r=2.9mm used in this embodiment.

[0056] Difference 2: In this embodiment, if Figure 4(d)-Figure 4(f) As shown, the dimensions of the deformed area in the center of the sample (diameter W = 12mm, transition fillet radius R = 0.4mm, thickness t = 0.6mm).

[0057] Difference 3: In this embodiment, Fig. 6(a) is different from Fig. 5(a) in that the fracture of the plate shows an oblique fracture.

[0058] Difference 4: Different from Figure 5(c), seven material points at the typical positions 0, 1, 2, 3, 4, 5, and 6 in Figure 6(b) were selected respectively, and by analyzing the thickness-direction strain with deformation It basically shows a linear growth (Fig. 6(c)), and there is no evolution of obvious diameter shrinkage. It can be seen that the failure mechanism of the plate at t...

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Abstract

The invention relates to the technical field of measurement, in particular to a method for obtaining tension-shear combined deformation of metal sheets by use of uniaxial tension and belongs to a metal sheet deformation testing method. According to the method, a geometric structure of a new sample is designed, and tension-shear combined deformation is obtained through uniaxial tension of the metalsheets in the deformation area; the designed sample is characterized by having arc notches and a thinning central deformation area, and a uniform linear tension-shear strain path is obtained in the central deformation area. Accordingly, the uniform linear tension-shear combined deformation route can be obtained in the larger deformation area under the uniaxial tension loading condition, and different tension-shear strain paths can be obtained by adjusting geometrical characteristic parameters of the sample. Linear tension-shear combined deformation is obtained through uniaxial tension, the uniform deformation area exists, and a novel reliable method is provided for accurately testing the yield and hardening behaviors and instability and breaking limit of the metal sheets under the tension-shear combined deformation condition.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a method for obtaining composite tension-shear deformation of a metal sheet by uniaxial stretching, which belongs to a deformation test method for a metal sheet. Background technique [0002] Metal sheets exhibit different mechanical behaviors (yielding, hardening, etc.) and formability (forming limit) when deformed by different strain paths. The test of deformation behavior of sheet metal under different strain paths is an important tool to obtain the deformation law and damage limit in the forming process of sheet metal. Generally, the strain path covered by it is from pure shear to isotropic double tension, and double tension deformation is common. Obtained by biaxial tension of cross-shaped specimens, plane strain by notched single-tensile specimens, and uniaxial tension by smooth single-tensile specimens with a central hole. For the tensile-shear compound deformation o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N3/08G01N3/06
CPCG01N1/28G01N3/068G01N3/08G01N2203/0017G01N2203/0647
Inventor 宋鸿武陈帅锋张士宏
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI