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Offset loading sample and method for testing shear wrinkling performance of plate

A technology of sheet shearing and measuring offset, which is used in the preparation of test samples, the use of stable shear force to test the strength of materials, and the measurement device. Matching and other issues to achieve high repeatability

Active Publication Date: 2022-05-27
HANDAN IRON & STEEL GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These studies have designed a special shear loading test device, but the sample form is more complex and the operation is relatively cumbersome, resulting in a long test period and high test costs.
In addition, these methods are aimed at the ideal condition of the sample under symmetrical loading, which is usually not consistent with the actual stress state
In general, there is still little research on the experimental methods of sheet metal wrinkling caused by shear stress, and it is necessary to further develop a simple and feasible experimental method for sheet shear instability wrinkling

Method used

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  • Offset loading sample and method for testing shear wrinkling performance of plate
  • Offset loading sample and method for testing shear wrinkling performance of plate
  • Offset loading sample and method for testing shear wrinkling performance of plate

Examples

Experimental program
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Effect test

Embodiment 1

[0049] The present invention will be further described by taking a SUS304 stainless steel plate with a thickness of 0.3 mm as an example. The yield strength of SUS304 stainless steel is 236 MPa, the elastic modulus is 194 GPa, and the Poisson's ratio is 0.3.

[0050] The steps of utilizing the method of the present invention to test the shear wrinkling properties of sheet metal are as follows:

[0051] (1) Determine the initial size of the bias-loaded sample according to the size of the sheet material;

[0052] Bias-loaded specimens such as figure 1 shown, the total length along the stretch direction L 120 mm, the total width perpendicular to the stretching direction W 40 mm, upper and lower clamping end lengths l 30 mm, upper and lower clamping end widths b They are 15 mm, 20 mm, and 25 mm, respectively.

[0053] (2) The finite element simulation method is used to analyze the deformation of the offset-loaded sample during the tensile process. The loading position of th...

Embodiment 2

[0059] Taking the DC04 low carbon steel sheet with a thickness of 0.7 mm as an example, the present invention will be further described. The yield strength of DC04 low carbon steel is 195 MPa, the elastic modulus is 210 GPa, and the Poisson's ratio is 0.3.

[0060] The steps of utilizing the method of the present invention to test the shear wrinkling properties of sheet metal are as follows:

[0061] (1) Determine the initial size of the bias-loaded sample according to the size of the sheet material;

[0062] Bias-loaded specimens such as figure 1 shown, the total length along the stretch direction L 80 mm, 90 mm, 100 mm, the total width perpendicular to the stretching direction W 40 mm; upper and lower clamping end lengths l 20 mm, upper and lower clamping end width b is 20 mm.

[0063] (2) The finite element simulation method is used to analyze the deformation of the offset-loaded sample during the tensile process. The loading position of the finite-element simulation...

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Abstract

The invention relates to an offset loading sample and a method for testing the shear wrinkling performance of a plate, and belongs to the technical field of plate manufacturing equipment and methods. According to the technical scheme, the device comprises a rectangular thin plate with the thickness of 0.1-3 mm, a rectangular area is cut off from the diagonal positions of the two ends of the rectangular thin plate in the stretching direction respectively, and the remaining rectangular areas serve as clamping ends of a stretching experiment. The method has the beneficial effects that the deformation of the bias loading sample in the stretching process is simulated and analyzed by utilizing a finite element, the size of the sample is determined according to the wrinkling height, and the out-of-plane displacement of the center of the sample perpendicular to the plate and the wrinkling height serve as wrinkling performance indexes of the plate under the action of shear stress; the wrinkles under different shear stresses are obtained by adjusting the sizes of the sample and the clamping end, a special mold is not needed, and the method is simple and easy to implement and high in repeatability.

Description

technical field [0001] The invention relates to an offset loading sample and a method for testing shearing and wrinkling properties of a plate, and belongs to the technical field of plate manufacturing equipment and methods. Background technique [0002] Due to factors such as material properties, part shape, mold and forming process, etc., the forming process such as sheet metal stamping may appear unstable and wrinkled, which has a very negative impact on the production process, product quality and even mold life. So far, a lot of theoretical and experimental studies have been carried out on the wrinkling problem of sheets under different forming conditions. Among them, mastering the wrinkling characteristics of various sheets under different forming conditions through experiments is very important for predicting and analyzing the wrinkling phenomenon, and reasonably formulating the forming process parameters, so as to control, improve and solve the wrinkling problem. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24G01N1/28
CPCG01N3/24G01N1/28G01N2203/0682G01N2203/0216Y02T90/00
Inventor 李冠楠温彤李俊生裴庆涛唐浩兴亢庆锋李成亮
Owner HANDAN IRON & STEEL GROUP