摘要
近年来,以有限元分析工具并结合优化算法来提高板料的成形性能已成为新的研究热点。然而,如何建立合理的板料成形质量评价准则以形成目标函数,从而量化冲压件的成形质量是其关键技术之一.该文在研究国内外现有的各种评价拉裂和起皱缺陷准则的基础上,提出了指数加权评价准则,该准则量化了单元落在成形极限图上不同区域和离安全区域距离远近不同分别对拉裂和起皱权值贡献的差异.结合方形盒标准考题验证了提出的评价准则的合理性.将该质量评价准则应用到了一个实际零件的成形优化研究中,优化的结果显著的提高了板料的成形性能.
In recent years, integrating finite element analysis with optimization algorithm to improve sheet metal forming property has become a new focus to investigate. However, how to establish a reasonable quality evaluation criteria to form objective functions, which estimates the property of sheet metal forming, is a key technology. The paper presents an exponential weighted evaluation criteria based on various existing criteria which can evaluate the defects of wrinkle and crack. The criteria can quantify different weights of crack and wrinkle in terms of the distance from elements to safety region on the forming limit diagram. The rationality of the criteria is validated through a square cup. The quality evaluation criteria is applied to a practical part forming optimization study, the result of optimization significantly improves the sheet metal forming property.
出处
《固体力学学报》
CAS
CSCD
北大核心
2009年第1期70-78,共9页
Chinese Journal of Solid Mechanics
基金
国家杰出青年基金项目(50625519)
长江学者和创新团队发展计划
国家973项目(2004CB719402)资助
关键词
板料成形
有限元分析
优化
sheet metal forming, finite element analysis, optimization
