锻压技术

镀层金属板冲压成形断裂失效的有限元模拟

英文标题：Finite element simulation of fracture in stamping for coated metal sheet

作者：伍杰马增胜阳习雨刘惺

单位：湖南工学院湘潭大学

关键词：镀层金属板冲压损伤有限元模拟

分类号：TG386

出版年,卷(期):页码：2015,40(3):136-140

摘要：

镀层金属板在加工过程中，由于工艺参数、模具几何参数的影响，经常会出现裂纹，并最终导致板材的断裂。以双面电沉积镍的低碳钢板为研究对象，采用基于连续介质损伤有限元模拟以及冲压成形实验相结合的方法对镀层金属板在冲压过程中的失效问题进行了研究。结果表明：随着冲压深度的增加，杯形件中的等效塑性应变与损伤值均增加，当冲压深度达到10 mm时，在杯形件冲头圆角处出现断裂现象。通过冲力冲程曲线与成形件形状的比较和损伤变量分布、等效塑性应变分布以及厚度减薄的分析发现，有限元模拟结果与冲压成形的试验结果符合得较好，证明了有限元模拟的正确性。

Cracks appear usually and eventually lead to failure in the coated metal sheet during the stamping process by the effects of process and tooling configuration parameters. For low carbon steel sheet with electrodeposited coating nickel of double-sided, its fracture in the stamping was studied by combining the continuum damage numerical simulation with the experiment. The results show that the damage and equivalent plastic strain increase with the increase of drawing depth. Fracture occurs at the radius corner of punch when the drawing depth increases to 10 mm. The experiment results is compared well with the simulation results by comparisons of punch displacement curve with the drawn part, distribution of damage variables, analyses of equivalent plastic strain and the thinning of blank. Further, the correctness of the finite element simulation is verified.

基金项目：

国家自然科学基金资助项目（11102176）；湖南工学院科研启动基金资助项目(HQ13010)

伍杰（1982-）, 男，博士，讲师

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