管材弯曲成型过程的有限元模拟

采用拖带坐标系下的退化壳单元，以及动态显式有限元方法求解管材在弯管机上的弯曲成型问题。管材的材料特性假定满足Ｈｉｌｌ各向异性的弹塑性准则，弯管机的弯曲模和压力模波假定为刚性表面，接触力通过罚参数方法计算。通过文中的几个算例表明，该方法是有效的。

The Finite Element Simulation of Pipe Bend Forming

A dynamic explicit finite element method is used to pipe bend forming processes on bender in this paper.The degenerated shell element and co-rotational coordinate system are employed.The material of pipe is assumed to satisfy Hill's anisotropic elasto-plastic yield condition.The bend die and press die are assumed as rigid surfaces and the contact force is computed by penalty method.Several numerical examples are given.They show that this method is effective.