Variable-rate stretching curve evaluation method

Abstract

The invention relates to a variable-rate tensile curve evaluation method, which combines a metal dynamic deformation theory with a rheological law, correlates strain rates with yield strength and tensile strength of a material, and evaluates a variable-rate engineering stress-strain curve by actually measuring the yield strength and the tensile strength of each sample at each strain rate by taking0.2%-1% as a standard. Compared with the prior art, the variable-rate tensile curve evaluation method has the beneficial effects that the variable-rate tensile curve evaluation method overcomes the defects that an existing method is large in random error and the like, a reasonable variable-rate engineering stress-strain curve range can be accurately evaluated, processed effective stress-strain curves are not overlapped, and the CAE collision simulation requirement is met.

Description

technical field [0001] The invention relates to the technical field of dynamic performance detection of automobile panels, in particular to an evaluation method of variable-rate tensile curves. Background technique [0002] The effective stress-strain curves of metal materials under different strain rate conditions are essential key data for automobile OEMs to accurately evaluate the real deformation state of materials in the CAE crash analysis process. In order to obtain non-overlapping effective stress-strain curves, materials often need to be tested multiple times under the same strain rate condition, and as the strain rate increases, the obtained stress-strain data will increase in a certain trend, and the higher the strain rate , the faster the tensile speed of the testing machine is, the more obvious the random error will be, resulting in greater differences in the engineering stress-strain curves obtained for each test under the same strain rate conditions. If a reas...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a variable rate tensile curve evaluation method, which overcomes the shortcomings of the existing method such as large random errors, can accurately evaluate the reasonable variable rate engineering stress-strain curve range, and realizes the effective stress-strain curve after processing Non-overlapping, meeting CAE collision simulation requirements

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