【摘要】 在非稳态大变形塑性成形过程中,由于节点的大范围移动和流动的非均匀性,导致分析精度下降。针对移动最小二乘近似精度的提高,尤其是边界附近节点分析近似精度的提高,提出了相应的处理方案,以保证分析的精度。通过采用影响域节点控制方法以及边界节点分布密度动态控制方法,实现了塑性成形过程的无网格伽辽金方法的自适应分析。对拉普拉斯方程及典型的大变形成形过程进行了分析,通过与拉普拉斯方程解析解和相应的商品化刚塑性有限元软件Deform的分析结果进行对比,验证了处理方案的正确性。更多还原

【Abstract】 The simulation precision will be deteriorated in the large plastic deformation process for large movement of the points and the non-uniformity of metal flow. Thus some adaptive dealing methods were developed through the improvement of the moving least-square approximation precision especially the approximation precision of points near the frictional boundary in order to improve the simulation precision of the analysis programs. The influence domain control method and adaptive boundary points setting method were developed and the large metal forming meshless analyses were realized. A Laplace problem and some metal forming processes were analyzed, through the comparisons with theoretical results of the Laplace problem and the commercial software Deform simulation data, the effectiveness of the methods developed here is demonstrated.更多还原