摘要
研究汽车覆盖件拉伸优化问题,针对汽车覆盖件容易出现起皱,传统研究方法没有考虑其成形过程中与模具接触,预测精度不高的现状。根据起皱预测理论,研究单面接触对起皱的影响。提出了高强度薄钢板的对角拉伸试验仿真。首先建立了标准的YBT(Yoshida Buckling Test)仿真模型,在有限元软件LS_DYNA上验证了仿真模型的正确性。进一步考虑冲压过程中板料与模具的接触状况,建立了带有单面接触的YBT仿真模型。结果表明,标准YBT试验中的起皱的高度较大,起皱原因是压应力导致的失稳。单面接触情况下压应力的释放得到抑制,起皱高度明显减小,明确了起皱的原因是卸载回弹,为设计提供了依据。
Automobile panels often have wrinkling problems, and the analysis of traditional method is inefficient because it ignores the sheet ＇ s practical contact situation in stamping progress. Based on wrinkling forecast theories, the method of FEM simulations combined with experiments was used to research YBT, and the simulations fitted well with the experiments results. Furthermore, considering the sheet＇ s practical contact situation, the single-contact-interface was introduced to the simulation. The study show that wrinkling phenomenon is obvious and caused by the instability of compressive stress in standard YBT, while in contact situation wrinkling is caused by springback and wrinkling height is obviously reduced because of the restrained compressed stress.
出处
《计算机仿真》
CSCD
北大核心
2012年第1期322-326,共5页
Computer Simulation
基金
国家自然科学基金项目(50905057)
教育部长江学者与创新团队发展计划(531105050037)
关键词
汽车覆盖件
起皱
单面接触
Automobile panels
Wrinkling
Single-connect-interface
