Method for testing wrinkling performance of plate based on uniaxial tension of perforated sample

A technology of unidirectional stretching and testing methods, which is applied in the direction of measuring devices, analysis materials, instruments, etc., and can solve the problems of comparability and insufficient operation convenience

Active Publication Date: 2020-10-23
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY +2
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Problems solved by technology

[0009] In general, the existing test methods for sheet metal wrinkling characteristics are insufficient in terms of comparability with the actual sheet metal forming state and conven...

Method used

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  • Method for testing wrinkling performance of plate based on uniaxial tension of perforated sample
  • Method for testing wrinkling performance of plate based on uniaxial tension of perforated sample
  • Method for testing wrinkling performance of plate based on uniaxial tension of perforated sample

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Embodiment Construction

[0051] The present invention will be described in further detail below in conjunction with the embodiment of the square plate sample.

[0052] The sample material is an Al6061 aluminum alloy plate with a thickness of 0.8 mm, a yield strength of 188 MPa, an elastic modulus of 68900 MPa, and a Poisson's ratio of 0.4.

[0053] The sheet metal wrinkling performance test method based on the uniaxial tension of the sample with holes of the present invention, the specific steps are as follows:

[0054] (1) The side length dimension L of the square plate sample is 100mm;

[0055] (2) Determine the diameter d of the circular inner hole at the geometric center of the sample:

[0056] The finite element numerical simulation method is used to analyze the deformation of the sample during uniaxial tension, and to obtain the stress distribution and wrinkling state inside the sample; according to Figure 1-3 The X transverse compressive stress S of the simulated sample at the moment of wrin...

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Abstract

The invention provides a method for testing the wrinkling performance of a plate based on uniaxial tension of a perforated sample. A circular inner hole is machined in the geometric center of a sampleto change the stress distribution in the uniaxial tension process of a plate, and the wrinkle resistance of a flat plate sample in different stress states is obtained. The sample can be strip-shaped,square or circular. The method specifically comprises the following steps of: (1) determining the shape and size of a sample; (2) analyzing uniaxial tension deformation of the sample by utilizing numerical simulation, and determining the diameter d of an inner hole according to stress distribution and the wrinkling height h; (3) processing the sample according to the shape and the size; (4) stretching the sample at a constant speed v on a universal testing machine; and (5) detecting and recording the wrinkling amount H of the sample. According to the method, by adjusting the size of the innerhole, the wrinkle resistance of the plate can be analyzed within a large dependent variable range, the wrinkle characteristic closer to the actual situation is obtained, no special clamp or device isneeded, and the method is simple, easy to implement and high in repeatability.

Description

technical field [0001] The invention relates to a method for testing the wrinkle performance of a metal sheet, in particular to a method for testing the wrinkle performance of a sheet based on uniaxial tension of a sample with a hole. Background technique [0002] Sheet metal stamping is an extremely widely used production method for thin-walled parts, and cracking and wrinkling are two types of defects that are most likely to occur in sheet metal stamping production. It is an important basic work to evaluate the formability of sheet metal based on these two types of defects, so as to provide reference for stamping process and die design. At present, there has been a lot of research on the cracking of sheet metal, and a variety of measurement and evaluation methods for thinning and cracking in the forming process of sheet metal have been established. Limit diagram), GB / T15825.6-2008 stipulates the specific method for measuring the formability of sheet metal using the "cone ...

Claims

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Application Information

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IPC IPC(8): G01N19/00
CPCG01N19/00
Inventor 邓建军张龙柱温彤陈子刚杨西鹏王连轩唐浩兴李晓广游建豪于光远崔兴贺吴鑫张东凯
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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