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Testing and calculation method for determining material scale distance effect curve

A technology of effect curve and calculation method, which is applied in the direction of calculation, analysis of materials, and testing of material strength by applying stable tension/pressure to achieve high precision and improve efficiency.

Active Publication Date: 2019-11-05
武汉上善仿真科技有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] First, compared with the method in literature [1], the DIC test technology is introduced into the uniaxial tensile test. "; on the other hand, cancel the judgment condition for determining the initial breaking point, but directly and objectively determine the initial breaking point

Method used

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  • Testing and calculation method for determining material scale distance effect curve
  • Testing and calculation method for determining material scale distance effect curve
  • Testing and calculation method for determining material scale distance effect curve

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Experimental program
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Effect test

Embodiment

[0090] In this embodiment, the material DP780 is used as an example to output the results under the integer gauge length from 1.0mm to 10mm. The model of the tensile testing machine used is Zwick / Roell Z050, the DIC test system is the ARAMIS system of GOM Company in Germany, and the data processing software For EXCEL, specify the test and calculation method of measuring material gauge length effect curve of the present invention, as figure 1 As shown, it includes the following steps:

[0091] Step 1, uniaxial tensile material DIC test, including the following steps:

[0092] The first step is to make the size of the tensile specimen for the uniaxial tensile DIC test of the material DP780, such as figure 2 As shown, the gauge length is 50mm, the width is 12mm, the thickness is 1.4mm, and the initial cross-sectional area is 16.8mm 2 , spray matte paint on the surface of one side of the tensile test piece, and the 50mm gauge length section of the tensile test piece after spray...

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Abstract

The invention discloses a testing and calculation method for determining a material scale distance effect curve, and particularly relates to the test-piece measurement node arrangement and output, true stress strain calculation, processing of true stress strain curves under different scale distances and scale distance effect curve drawing. Accordingly, by developing detailed technical processes for the uniaxial tensile DIC test, the specific technical requirements that the number of grids arranged in the width direction of a test-piece is twice the width are made, it is guaranteed that integerscale distances ranging from 1.0 mm to 10 mm are obtained physically, the technical objective of obtaining a scale distance effect curve to be used for setting material failure parameters in a material equivalent strain failure model is achieved, and the complexity of the problem of failure of vehicle crash simulation materials and material test cost are significantly lowered; therefore, the method has the important theoretical and engineering practical significance.

Description

technical field [0001] The invention relates to a test and calculation method for measuring the gauge-length effect curve of a material, in particular to a test, calculation and processing method for the gauge-length effect curve of a metal material. Background technique [0002] According to the current uniaxial tensile test standard, the processing of test data is only for the measurement data of the tensile specimen in the uniform necking section. Because of the measurement data of the local necking section, it is generally considered that the simple stress-strain state or The uniform deformation condition is discarded during data processing. In actual engineering problems, a large number of materials are faced with large deformation problems, indicating that the materials have entered the stage of local necking, such as stamping forming, collision bending and crushing, etc. Therefore, the level of theoretical understanding and testing techniques are objectively Under th...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/06G01N1/28G06F17/50G06F17/10
CPCG01N1/28G01N3/068G01N3/08G01N2203/0017G01N2203/0647G06F17/10
Inventor 肖锋
Owner 武汉上善仿真科技有限责任公司
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