摘要
针对微观状态下的Cu-Fe-P合金引线框架材料起皮处Fe颗粒密集区,采用弹塑性有限元方法建立力学模型分析残余应力的分布。主要研究了对施加一定位移载荷的模型卸载后Fe颗粒对材料残余应力分布规律的影响。研究发现,Cu基体和Fe颗粒界面附近两相的残余应力值很大;且在卸载前后沿载荷方向,颗粒和基体的残余应力方向相反。界面两侧的残余应力差值也因两种反向应力的作用而加大,最终导致界面处被撕裂,材料表面起皮。
The mechanical model is established to analyze the residual stress distribution of microstructure about Cu-Fe-P alloy for lead frame in particles＇ dense area by finite element method for els-plastics deformation process. The effect of the Fe particle on the residual stress is mainly analyzed. It is found that residual stresses of Cu matrix and Fe particle near the interface are very large. On the direction of load applied and removed, residual stresses of particle and matrix are opposite. So stress difference between both sides is larger with the reverse stresses＇ function. The interface will be mangled and even some surface peelings occur.
出处
《热加工工艺》
CSCD
北大核心
2006年第12期7-10,共4页
Hot Working Technology
基金
国家高技术(863计划)研究开发计划(2002AA331112)
西北工业大学博士论文创新基金资助项目(CX200409)
河南科技大学科学研究基金资助项目(20062Y041)
