中国激光, 2010, 37 (1): 291, 网络出版: 2010-01-16  

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
作者单位
山东大学 材料科学与工程学院,山东 济南 250061
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。
Abstract
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.
参考文献

[1] . Huang,H. Gao,W. D. Nix et al.. Mechanism-based strain gradient plasticity-II. Analysis[J]. Journal of the Mechanics and Physics of Solids, 2000, 48(1): 99-128.

[2] M. Geiger,R. Eckstein. Microforming advanced technology of plasticity [C]. Proceedings of the 7th ICTP,Yokohama,Japan,2002,6:327-338

[3] . Geissdorfer,U. Engel,M. Geiger. FE-simulation of microforming processes applying a mesoscopic model[J]. International Journal of Machine Tools and Manufacture, 2006, 46(11): 1222-1226.

[4] . W. Ku,B. S. Kang. FE approach and experiments for an axisymmetric micro-yoke part forming using grain element and grain boundary element[J]. Journal of Materials Processing Technology, 2003, 140: 65-69.

[5] T. W. Ku,J. K. Lee,B. S. Kang. Development of finite element analysis scheme for micro forming using grain element and grain boundary element [C]. Taipei:2005 International Conference on Advanced Manufacture,ICAM2005,2006,505-507:61-66

[6] . Chen,N. A. Fleck. Size effects in the constrained deformation of metallic foams[J]. Journal of the Mechanics and Physics Solids, 2002, 50(5): 955-977.

[7] 周建忠,杜建钧,黄舒 等. 激光喷丸后板料表面微观形貌的可视化数值研究[J]. 中国激光,2007,34(5):728-732

    Zhou Jianzhong,Du Jianjun,Huang Shu et al.. Visual numerical study on surface micro-topography of sheet metal by laser peening [J]. Chinese J. Lasers,2007,34(5):728-732

[8] . . Energy level effects on deformation mechanism in micro-scale laser peen forming[J]. Journal of Manufacturing Processes, 2007, 9(1): 1-12.

[9] 张明浩. 超薄板材脉冲激光微冲击成形过程数值模拟[D]. 济南:山东大学,2008. 46

    Zhang Minghao. Numerical simulation for micro laser peen forming on ultrathin sheet [D]. Jinan:Shandong University,2008. 46

[10] 周建忠,张永康,周明 等. 单次激光冲击下板料变形的理论分析[J]. 中国激光,2005,32(1):135-138

    Zhou Jianzhong,Zhang Yongkang,Zhou Ming et al.. Theoretical analysis on deformation of sheet metal under one laser shot loading [J]. Chinese J. Lasers,2005,32(1):135-138

[11] 陈瑞芳,郭乃国,花银群. 激光冲击参数对残余应力场影响的三维数值模拟[J]. 中国激光,2008,35(6):931-936

    Chen Ruifang,Guo Naiguo,Hua Yinqun. Numerical simulation of effects of laser shock parameters on residual stress field induced by laser shock processing [J]. Chinese J. Lasers,2008,35(6):931-936

刘晶, 刘韧, 季忠, 张明浩. 基于晶粒晶界有限元的激光微冲击成形数值分析[J]. 中国激光, 2010, 37(1): 291. 刘晶, 刘韧, 季忠, 张明浩. Numerical Analysis of Micro Laser Peen Forming Based on Grain and Grain Boundary Element[J]. Chinese Journal of Lasers, 2010, 37(1): 291.

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