锻压技术

铝合金板弯曲回弹试验与有限元仿真

英文标题：Test and FEM simulation of springback for aluminum alloy sheet bending

作者：王巍李东升李小强

单位：北京航空航天大学

分类号：TG316.1+4

出版年,卷(期):页码：2013,38(3):160-164

摘要：

采用NUMISHEET'2002会议提出的铝合金板6111-T4大曲率半径纯弯曲回弹试验方案，在不同冲压行程下，对板料不同轧制方向的回弹角、成形力等进行试验研究。基于有限元软件eta/Dynaform,运用Hill'48屈服准则和Barlat'89屈服准则，模型分别采用指数强化模型和线性强化模型进行有限元仿真，与试验结果对比表明：随着凸模行程增加，冲压力增大，回弹后夹角增大；采用Barlat'89屈服准则和指数强化模型板料回弹值精度最高，误差为8.86%；采用Hill'48屈服准则和指数强化模型次之，误差为14.67%；屈服准则的选取对预测板料回弹量有较大影响，而强化模式的选取对回弹量的影响则不显著。

Aluminium 6111-T4 large curvature radius of pure bending springback examples being put forward in the NUMISHEET' 2002 session was adopted to research springback angle and forming force of the different sheet rolling directions. Based on the Hill'48 yield criterion and Barlat'89 yield criterion from the finite element analysis software eta/Dynaform, finite element simulation was conducted. During this study process, the exponential hardening model and linear hardening model were used. Comparing the simulated results with the experimental results，it shows that the punch pressure increases with the increasing of the punch stroke, the springback angle increases as well; the simulated springback accuracy value is the highest and the error is 8.86% by adopting the Barlat'89 yield criterion and index hardening model, and the springback accuracy value obtained by adopting the Hill'48 yield criterion and index hardening model is smaller and the error is 14.67%; the mode of yield criterion has larger effects on springback value than hardening expression, and the hardening mode has little effect on springback value.

基金项目：

国家自然科学基金资助项目（50905008）；航空科学基金资助项目（2010ZE51050）

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