基于灵敏度分析的板料拉深坯料形状优化方法

采用基于坯料形状变化灵敏度分析的方法 ,利用LS DYNA3D有限元程序计算确定任意形状拉深件成形时坯料的最优形状 ,可经较少的迭代次数取得比较满意的计算结果

Blank shape optimization in deep-drawing process by sensitivity analysis

In this paper, a systematic method based on shape sensitivity analysis is proposed to optimize the blank shape of arbitrary shape cups in deep-drawing.The final deformation shape is defined by the drawn piece with a uniform trimming allowance at the flange,the corresponding initial blank i.e. the optimal blank shape which gives the final shape after deformation can be found.By using a well-known dynamic explicit analysis code LS-DYNA3D,the deformation of the assuming initial blank and the offset blank are calculated and the shape sensitivity of the outmost node can be obtained numerically,then the initial blank is modified and the deformation process is analyzed again.Only after a few times of modification,the contour error reaches a specified allowance.