Strategy to Improve Computation Precision in Inverse Analysis Method of Sheet Metal Stamping
Strategy to Improve Computation Precision in Inverse Analysis Method of Sheet Metal Stamping
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DOI：
10.3901/jme.2009.10.300
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发表时间：
2009
影响因子：
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通讯作者：
Wang Zhao-qing
中科院分区：
文献类型：
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作者：
Wang Zhao-qing
传统的金属板材冲压逆分析方法（TIAM）对应力分布的估计效果不佳，这主要是由于变形历史的丢失。靠近模具入口半径的元件在成形操作期间会受到弯曲和伸直。此外，应力积累通常出现在模具入口区。使用快速可靠的搜索方案来查找变形过程中经过模具入口半径的元素。以下过程用于修改应力分布。引入了多步加载的有效应力-应变关系来更新应力分布。该本构方程可以避免基于增量有限元法（FEM）的应力/应变更新算法的复杂性，同时可以考虑模具入口半径对变形历史的影响。 Numisheet'93 中提出的 U 形弯曲试验的深拉表明，与基于增量有限元的软件 ABAQUS/Standard 相比，这些本构方程可以显着增强应力分布的预测。
The traditional inverse analysis method (TIAM) of sheet metal stamping gives bad estimation of stress distribution mainly due to the loss of history of deformation. Elements near the die entrance radius are subjected to bending and unbending during forming operation. Moreover,stress accumulation can usually be found in die entrance zone. A fast and reliable searching scheme is used to find elements passing by die entrance radius during the deformation process. The followed procedure has been used to modify stress distributions. An efficient stress-strain relation for multi-step loading is introduced to update stress distributions. This constitutive equations can avoid the complexity of incremental finite element method (FEM) based stress/strain updating algorithms,while can consider the effects of die entrance radius on deformation history. Deep drawing of the U-bending test proposed in Numisheet'93 demonstrates that these constitutive equations can significantly enhance the prediction of stress distribution by comparison with incremental FEM based software ABAQUS/Standard.