汽车用镀锌钢板单向拉伸试验的细观损伤力学分析

Mesoscopic Damage Mechanical Analysis for Uniaxial Tension of Automobile Galvanized Steel Sheet Specimens

基于Gurson-Tvergaard-Needleman(GTN)细观损伤模型,提出了可用来描述各向异性金属板材成形的Hill 48-GTN模型,并对汽车用镀锌钢板单向拉伸试验进行了有限元分析。结果表明:Hill 48-GTN模型可以同时描述试样拉伸变形过程中的弹塑性行为和损伤演化规律,最大孔洞体积分数可以作为判断板料成形极限的参数,在单向拉伸条件下,材料的起裂点位于试样对称中心区域,与试验现象一致。

Based on the Gurson-Tvergaard-Needleman（GTN） mesoscopic damage model, a Hill＇48- GTN anisotropic damage model is presented to describe anisotropic sheet metal forming, and the uniaxial tension test of automobile galvanizing strip specimens. Simulation results show that HilI＇48-GTN model can describe both the elastic-plastic behavior and damage evolution. The damage variable, void volume fraction can be viewed as a forming limit parameter. The maximum void volume is located at the center of the specimen. Simulation results are in agreement with the test.