Quick acquisition method of true stress strain curve in whole process of uniaxial drawing

Abstract

The invention relates to a quick acquisition method of a true stress strain curve in whole process of uniaxial drawing. The method comprises the steps of verifying the accuracy of a CAE (computer aided engineering) simulation model by a true stress-true strain curve at an even plastic deformation stage based on the static uniaxial drawing data, and indirectly predicting the true stress-true strain curve at a necking section through the CAE model to obtain the equivalent true stress-true strain curve in whole process of uniaxial drawing. The simple acquisition method of the true stress strain curve of the material in whole process of uniaxial drawing is easy and simple to operate, thus meeting the need of the CAE simulation in the engineering design. Furthermore, the quick acquisition method is in combination with a CAE technology, the influence of the grid effect to the CAE analysis accuracy can be weakened as much as possible.

Description

technical field [0001] The invention relates to the test of the mechanical properties of metal materials and the constitutive relationship of materials, in particular to a method for processing test data combined with CAE technology, and in particular to a method for quickly obtaining the full-range true stress-strain curve of uniaxial tension. Background technique [0002] In existing CAE simulation calculations, the plasticity curve of isotropic metal materials is obtained through uniaxial tensile tests. In engineering applications, there are usually two ways to deal with the true stress-strain curve in the necking stage: one is along the Extend along the tangent of the true stress curve in the uniform plastic deformation stage, and the CAE simulation software will automatically extend the extension according to the power function; another method is to set the true stress value after the necking starts to remain unchanged, that is, the true stress after the necking The str...

AI Technical Summary

Problems solved by technology

[0009] 3) After the necking begins, the elongation is no longer uniformly distributed along the test gauge length, the necking area is very large, and the outside of the necking area is very small, the above formula is no longer applicable to the transformation from the engineering stress-strain curve to the real stress-strain curve convert

[0012] To sum up, since the true stress and true strain curve obtained by the original method is not the actual trajectory of material deformation, there is a big difference between the part deformation and the actual situation at any time of CAE simulation

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