复杂形状的中厚板件拉深成形动力显示有限元分析  

Dynamic Explicit Finite Element Analysis of Deep-Drawn Medium-Thick Plate with Complex Shapes

作　　者：滕宏春[1] 程丽[1] 

机构地区：[1]南京工业职业技术学院,南京210016

出　　处：《机械科学与技术》2005年第10期1250-1253,共4页Mechanical Science and Technology for Aerospace Engineering

摘　　要：将厚向异性屈服函数、单元级双面接触算法的能够反映强烈弯曲效应的M ind lin曲壳单元模型引入动力显式中心差分格式的有限元算法,并组入自主开发的板成形CAE商品化软件KMAS系统中,建立对复杂形状的中厚板件拉深成形有限元模拟分析算法;在此基础上,以轿车摇臂厚板金件为例分析了材料厚向异性参数r值、凹模圆角以及压边力大小对此类成形件成形性的影响。通过数值模拟与实际拉深成形实验的对比,验证了本文方法的有效性;同时,结合实验研究了此类单元对工具弯曲圆角大小的适应性。The Hill＇s 1979 yield function with thickness anisotropy and Mindlin shell element with double-surface contact algorithm at element level, which can reflect strong bending effects and changing gaps between die and punch, are introduced into the dynamic explicit FEM algorithm, and integrated into dependently developed CAE code KMAS for sheet metal forming. The proposed method is suitable for deep drawn FEM simulation of medium thick sheet metal with complex shapes. To verify the method, the deep processes of a car＇s rocker are numerically simulated, in which the influence of normal anisotropic parameter r, die corner radius and binder-force on formability of the sheet metal is studied. Comparison between numerical simulation and experimental results shows the effectiveness of the present method. Besides, based on experimental results, the adaptability of present element model on size of the die-corner in tools also is analvzed .

关 键 词：中厚板 拉深Mindlin 曲壳单元 动力显式有限元算法 

分 类 号：TG302[金属学及工艺—金属压力加工]