The effect of non-linear recovery on springback prediction
The effect of non-linear recovery on springback prediction
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DOI：
10.1016/j.compstruc.2011.03.010
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发表时间：
2011-07
影响因子：
4.7
通讯作者：
S. Chatti;Noureddine Hermi
中科院分区：
文献类型：
--
作者：
S. Chatti;Noureddine Hermi
回弹的数值预测一直是板料成形中的主要问题之一。板料成形过程回弹预测的质量取决于对整个板料应力分布的准确估计。特别是，在有限元分析中，几位作者观察到，在应力反转过程中，卸载弹性模数(非线性恢复)随着塑性预应变的增加而减小，这一点通常没有考虑在内。提出了考虑塑性预应变和卸荷应力作用下的弹性模量演化模型。数值模拟表明，该模型与非线性运动硬化模型相结合，能较准确地预测回弹量。
Numerical prediction of springback remains one of the major problems in sheet metal forming. The quality of springback prediction for a sheet metal forming process depends on a precise estimation of the stress distribution all over the metal sheet. In particular, the decrease of the unloading elastic modulus (non-linear recovery) with increasing plastic prestrain during stress reversals, observed by several authors, was commonly not taken into account in FE analysis. A model is proposed which takes the elastic modulus evolution with plastic prestrain and the unloading stress into account. Numerical simulations show that this model coupled with a non-linear kinematic hardening model can accurately predict the springback amount.