环件辗扩过程仿真中的自适应单元重划分  

Adaptive element remesh in simulation of ring rolling process

作　　者：张学宾[1,2] 吴明华 李志刚[2] 

机构地区：[1]河南科技大学材料学院,河南洛阳471039 [2]华中科技大学 材料成形与模具技术国家重点实验室,湖北武汉430074 [3]一汽大众汽车有限公司,吉林长春130011

出　　处：《锻压技术》2012年第2期171-174,共4页Forging & Stamping Technology

基　　金：国家重大专项子课题资助项目(2009ZX04014-074-05);华中科技大学材料成形与模具技术国家重点实验室开放基金资助项目(09-12);河南科技大学博士科研启动基金资助项目;河南科技大学校基金资助项目(2004ZY032)

摘　　要：在环件辗扩过程动力显式有限元分析中发现,大变形造成单元的畸变。研究了单元自适应重划分算法。在分析工件单元变形的度量基础上,提出了基于空间域离散误差的单元重划分触发准则。基于传统的栅格法思想,针对环件辗扩的特殊性建立了标准栅格,通过边界拟合和节点平滑完成了重划单元的生成。通过平滑物理量、新单元节点在旧单元中包含测试以及新旧单元间物理量的映射完成了物理量的继承和传递。最后,通过算例验证了单元自适应重划分算法的有效性。In FEM simulation of ring rolling process, element distortion is aroused by large deformation. An adaptive mesh refinement and remesh algorithm was studied. Based on analyzing the mesh distortion, a remesh activation criteria was put forward according to the discrete error of space domain. Considering the features of ring rolling, the new mesh was generated by an improved grid-based algorithm through establishing standard ring grids. The field variables inheritance between the new and original meshes was accomplished by variable smoothing and mapping transformation. Finally, the validity of the adaptive mesh refinement and remesh algorithm is proved by computation examples.

关 键 词：环件辗扩 有限元仿真 自适应 单元重划分 

分 类 号：TG316.1[金属学及工艺—金属压力加工]