摘要
The effect of friction coefficient on the deep drawing of aluminum alloy AA6111 at elevated temperatures was analyzed based on the three conditions using the finite element analysis and the experimental approach.Results indicate that the friction coefficient and lubrication position significantly influence the minimum thickness,the thickness deviation and the failure mode of the formed parts.During the hot forming process,the failure modes are draw mode,stretch mode and equi-biaxial stretch mode induced by different lubrication conditions.In terms of formability,the optimal value of friction coefficient determined in this work is 0.15.At the same time,the good agreement is performed between the experimental and simulated results.Fracture often occurs at the center of cup bottom or near the cup corner in a ductile mode or ductile-brittle mixed mode,respectively.
通过有限元分析和试验的方法分三种情况研究了摩擦因数对AA6111铝合金热冲压筒形件的影响。结果表明,摩擦因数和润滑位置对铝合金热冲压成形件的最小厚度、厚度均匀性和失效形式影响显著。热冲压过程中,由于不同的润滑条件,试件的失效形式主要有拉-压失效、拉-拉失效和等双拉失效。基于对成形性的考虑,摩擦因数的最优值为0.15。同时,有限元仿真和试验结果具有较高的一致性。破裂通常发生在筒形件底部中心和底部圆角附近,断裂形式分别为韧性断裂和韧性脆性混合断裂。
基金
Project(2009ZX04014-074)supported by the National Science and Technology Major Project of China
Project(P2014-15)supported by the State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,China
Project(20120006110017)supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China
