Reverse method of characteristic parameters of material of automobile body stamped steel plate

Abstract

The invention relates to a reverse method of characteristic parameters of the material of an automobile body stamped steel plate. The method is characterized in that the method comprises the following steps: 1, carrying out area division on the automobile body stamp-formed steel plate; 2, arranging test points on the surface of the stamp-formed steel plate; 3, carrying out tensile tests on the stamp-formed steel plate; 4, establishing a direct problem simulation model of the tensile tests of the stamp-formed steel plate; 5, researching a stress strain curve of the material, and converting an enhancement coefficient K and a hardening exponent n of the reverse material to reverse parameters epsilon p and delta K; 6, comparing test response data with simulation response data to form an objective function, thereby forming a reverse problem model; and 7, optimizing the reverser problem model to acquire the materials parameters K and n of each subarea. The subarea calibration method for describing the stamp-formed body steel plate provided in the invention allows a plurality of areas to be simultaneously tested, and only a less amount of tests to be needed to obtain all the materials parameters of each subarea of the stamped steel pate

Description

technical field [0001] The invention relates to the technical field of material testing, in particular to a reverse calculation method for material characteristic parameters of stamped steel plates of automobile bodies. Background technique [0002] Accurate mechanical analysis of automobile body must be based on accurate material mechanical property parameters. The stamping process is generally used in the forming of body panels. The surface shape of the stamping parts is complex, and the mechanical properties of the deformed parts have changed greatly compared with those before deformation, and the material properties of different parts are also different due to the degree of deformation. Therefore, raw materials The analysis of the mechanical characteristic parameters will produce errors, and it is necessary to re-measure the material parameters of the steel plate after stamping. [0003] At present, the determination of material characteristic parameters of body stamped...

AI Technical Summary

Problems solved by technology

For automobile body steel plates, on the one hand, due to the irregular shape, it is difficult to sample and make standard test pieces, which makes it difficult to effectively apply the tensile test; Parameters All the deformed areas of the stamped steel plate of the car body must be sampled one by one for tensile testing, which will inevitably increase economic and time costs

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