用大变形壳元数值模拟薄钣的深冲成形

Numerical Simulation of Sheet Metal Forming by Using Large Deformation Shell Elements

开发了大变形弹塑性壳单元有限元程序．为了改进增量计算的收敛性，程序中采用Ｃ１连续的几何非线性──材料非线性三角形浅壳单元．为了有效计算广泛存在于薄板成形过程中的接触问题，提出了混合半道解法有限元解法计算接触问题．并给出了若干计算结果，验证了计算方法的有效性．

The large deformation elashc-plastic shell finite element code is developed. Inorder to improve the convergence of incremental calculations, the C1-conhnintygeometric nonlinear-material nonlinear triangle shallow shell finite elements are applied inthe code. Also, a mixed send-inverse finite element contact algorithm is created foreffective calculations of contact problems widely existing in sheet metal formingprocesses. To verify the computational code based on present shell element and contactalgorithm, some numerical results are worked out. These results are compared with othernumerical or analytical solutions, which turns out to be good in agreement.