Finite element procedures for strain estimations of sheet metal forming parts
Finite element procedures for strain estimations of sheet metal forming parts
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DOI：
10.1002/nme.1620300804
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发表时间：
1990-12
影响因子：
2.9
通讯作者：
Y. Guo;J. Batoz;J. M. Detraux;P. Duroux
中科院分区：
文献类型：
--
作者：
Y. Guo;J. Batoz;J. M. Detraux;P. Duroux
开发了一种有限元算法，用于在设计阶段预测板料成形件的应变分布，并对其成形性进行评估。该算法简称为逆方法，因为我们知道最终产品上物料点的位置，并确定初始毛坯中相应物料点的位置。这也是一种直接算法，避免了塑性和接触的路径依赖增量过程。本文介绍了膜三角形单元的大对数应变、塑性变形理论、金属板材的各向同性和各向异性材料特性以及非线性求解技术等方面的理论问题。文中还研究了凸模和压边摩擦力的影响、初始毛坯轮廓的“优化”和分次拉深等问题。将计算结果与实验结果和更为经典的增量法进行了比较。
A finite element algorithm is developed to predict the strain distribution of sheet forming parts and to evaluate their formability at the design stage. The algorithm is simply called the inverse approach since we know the positions of the material points on the final product and we determine the positions of the corresponding material points in the initial blank. This is also a direct algorithm which avoids the path dependent incremental procedure of plasticity and contact. This paper presents some theoretical aspects related to the large logarithmic strains with membrane triangular elements, the deformation theory of plasticity, the isotropic and anisotropic material properties of metal sheets and the non-linear solution techniques. Some particular problems are also studied, such as the influence of friction forces under the punch and blankholders, the ‘optimization’ of the initial blank's contour and the deep drawing in several steps. The results are compared with those obtained by experiments and by the more classical incremental approach.