两种强化模型在拉伸筋阻力计算中的比较

Comparison between Two Hardening Models in the Calculation of Drawbead Restraining Force

将等向强化模型与运动强化模型分别引入逐级更新 Lagrange有限元列式 ,采用八节点平面应变单元 ,对拉伸筋阻力进行了数值计算 ,并将两种模型的计算结果进行了比较与讨论。运动强化模型更好地反映了板料在拉伸筋处的弯曲反弯过程 ,可以更准确地预测拉伸筋阻力。

An isotropic hardening model and a kinematic one are introduced into Updated Lagrange FEM formula respectively and eight-node plane strain element is employed to calculate drawbead restraining force. The results of the two models are compared and discussed. The kinematic hardening model can better reflect the bending and unbending process of sheet metal during passing through drawbead and predict drawbead restraining force more accurately.