变薄拉深过程模拟的有限元动力显式算法  

Finite element dynamic explicit method in ironing process simulation

作　　者：许江平[1] 柳玉起[1] 章志兵[1] 杜亭[1] 

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

出　　处：《锻压技术》2008年第5期38-43,共6页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(50575080);国家科技支撑项目资助(2006BAF01A43)

摘　　要：为研究变薄拉深工艺中材料流动变形,开发了基于单点积分和粘性阻尼沙漏控制算法相结合的八节点六面体单元的有限元动力显式算法程序。采用粘性沙漏控制算法有效控制了由于单点积分造成的沙漏模式,节省了计算时间。同时,沿厚向划分多层网格、三维的本构关系以及双面接触算法,可以精确获取板料应力应变状态。最后给出了圆筒件的变薄拉深成形模拟实例,通过与实验结果的比较,验证了此实体单元的实用性。An 8-node hexahedral element finite dement dynamic explicit program, combining one-point integration with viscosity damping hourglass control algorithm, was developed for studying the material flowing deformation in ironing process. Such hourglass control method effectively suppressed the spurious modes activated by reduced integration, and saved too much calculation time. Meanwhile, the multiple layers meshes along thickness direction, 3D constitutive law and double sides contact algorithm could accurately describe distribution of stress and strairu Finally, example of ironing process simulation of thick cylinder part shows this solid element valid by comparing with experimental results.

关 键 词：六面体单元 单点积分 沙漏控制 变薄拉深 动力显式算法 

分 类 号：TG386[金属学及工艺—金属压力加工]