基于晶粒晶界有限元的激光微冲击成形数值分析  

Numerical Analysis of Micro Laser Peen Forming Based on Grain and Grain Boundary Element

作　　者：刘晶[1] 刘韧[1] 季忠[1] 张明浩[1] 

机构地区：[1]山东大学材料科学与工程学院,山东济南250061

出　　处：《中国激光》2010年第1期291-295,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金(50775131);山东省自然科学基金(Y2007F55);教育部留学回国人员科研启动基金资助项目

摘　　要：激光微冲击成形(μLPF)是利用脉冲激光产生的等离子体爆轰波的冲击力效应使超薄板材产生塑性变形的新技术。通过自主开发的有限元网格划分程序MicroMesh,实现了规则晶粒、晶界以及不规则晶粒、晶界的网格划分,并利用动态显式有限元方法(FEM),对超薄板材脉冲激光微冲击成形过程进行了晶粒级的数值模拟。较之一般的连续介质有限元方法,考虑晶粒和晶界的有限元法能够更好地反映板材的微观组织与性能。研究结果表明,该方法可以有效地模拟激光微冲击成形中板材的变形过程。Micro laser peen forming（μLPF） is a non-thermal laser forming method by using short,intense shock wave induced by laser irradiation for shaping the micro parts.Through the independent development of the mesh generation program MicroMesh,it is realized to construct the regular grain element and the grain boundary element as well as the irregular grain element and grain boundary element.Then the dynamic explicit finite element method（FEM） is employed to simulate the process of μLPF of ultrathin foil at a grain-level.Compared with the general continuum finite element approach,this method is more suitable for describing the microstructure and mechanical properties of the foil,and the results show that it can be used to simulate the μLPF process.

关 键 词：激光技术 激光微冲击成形 晶粒 晶界 有限元法 

分 类 号：TN249[电子电信—物理电子学]