|
摘要：
|
|
针对超薄板料多次拉深数值模拟中出现的网格翘曲和质量增大过大问题,从有限元理论基础和材料厚度的特点出发,指出薄板多次拉深成形仿真过程中应注意的几个关键技术问题:单元大小、单元法向之间夹角、单元厚度、质量缩放因子。并通过钢笔外壳多次拉深实例说明,及时修改自适应划分网格参数可以避免网格翘曲,随着网格变小要相应调整质量缩放因子以降低虚拟惯性力。
|
|
For the matter of mesh warping and mass enlargement in multi-stage drawing numerical simulation of ultra-thin sheet,the reasons were analyzed in view of the finite element theory and the material thickness.The key technologies used in simulation,such as element size,the angle between element normal,element thickness and mass scaling were pointed out.Through pen shell multistage drawing,it could be realized that modifying parameters of adaptive meshing could avoid mesh warping,and with the element becoming smaller it needed to adjust the mass scaling factor in order to reduce the virtual inertia force.
|
|
基金项目：
|
|
广州市科技攻关资助项目(2007Z2-D9031)
|
|
作者简介：
|
|
|
|
参考文献：
|
[1]喻祖建,李华基.板料多次拉深成形仿真过程关键技术研究[J].计算机仿真,2006,23(10):277-280.
[2]LSTC.LS-DYNA Keyword User s Manual[Z].LivermoreSoftware Technology Corporation,2003.
[3]LSTC.LS-DYNA Theoretical Manual[Z].Livermore Soft-ware Technology Corporation,1998.
[4]林忠钦.车身覆盖件冲压成形仿真[M].北京:机械工业出版社,2005.
[5]王青春,范子杰.利用Ls-Dyna计算结构准静态压溃的改进方法[J].力学与实践,2003,25(3):20-22.
|
|
服务与反馈：
|
|
【本网站尚未开通全文下载服务】【加入收藏】
|
|
|
|
