全自动自适应法兰成形数值模拟

FULLY AUTOMATED ADAPTIVE FLANGES FORMING NUMERICAL SIMULATION

给出弹塑性金属成形后置误差估计式，并以此计算出各单元误差及重分网格预示尺寸。采用三次均匀Ｂ样条表达模具边界，自动计算每一边界点处曲率，自动对此Ｂ样条按预示边界尺寸及曲率进行分割，实现了误差计算、边界结点生成、自适应网格生成、有限元分析及数值结果后处理的自动化及一体化。利用此系统对法兰成形进行了数值模拟，进行了法兰成形实验，数值计算结果与实验结果进行了对比，二者吻合较好。

In this paper, a posteriori error estimator based on elastoplastic theory is introduced. Errors of each element and predicted mesh sizes are calculated. Cubic uniform Bsplines are used to describe the boundary of the forging and dies, the curvature of each boundary node is calculated. The Bsplines are automatically cutted according to the predicted sizes and the curvature. Error estimation, boundary node generation, adaptive meshes generation, FEM analysis and the postprocessing of results are combined and automated. By this system, the flanges forming is numerically simulated. The flanges forming experiment is done. The results of calculations and experiments are identical.