有限元分析等通道-螺旋挤压中螺旋参数的影响  

Finite element analysis for effect of spiral parameters on equal channel angular and spiral eextrusion

作　　者：卢立伟[1] 赵俊[1] 刘龙飞[1] 刘婷[1] 陈志钢[1] 刘天模[2] 

机构地区：[1]湖南科技大学机电工程学院,湖南湘潭411201 [2]重庆大学国家镁合金工程技术中心,重庆400044

出　　处：《兵器材料科学与工程》2014年第6期72-76,共5页Ordnance Material Science and Engineering

基　　金：湖南省自然科学基金资助项目(14JJ3111;12JJ3048);校博士科研启动基金(E51353)

摘　　要：对等通道挤压-螺旋成型模型进行数值模拟计算,分析转角剪切与旋转剪切对AZ31镁合金在成型过程中等效应力、应变和挤压力的影响。结果表明:经等通道挤压-螺旋成型后,随螺旋长度、螺旋角度和螺旋凹槽深度的增加,试样所获得的等效应变更大,分布更均匀,AZ31镁合金的塑性应变值最高达2.1;随螺旋长度、螺旋角度增加,试样获得的等效应力更大,但随螺旋凹槽深度的增加,等效应力无明显变化,在等通道的转角区和螺旋变形的旋转区出现明显的应力集中。The numerical simulation method was used to calculate the equal channel angular and spiral extrusion,and effects of corner and rotational shearing on the equivalent stress,strain and load-stroke of AZ31 Mg alloys were analyzed. The results show that with the length of spiral,spiral angle and the spiral groove depth increasing,the equivalent strain increases and distributes more uniform,the equivalent strain of AZ31 Mg alloys can be up to 2.1. With the length of spiral and spiral angle increasing,the obtained equivalent stress of specimen is higher,but with the increase of the spiral groove depth,the equivalent stress has no obvious change,stress is mainly concentrated on the zone of corner of equal channel angular and rotation zone of spiral deformation.

关 键 词：AZ31镁合金 等通道挤压 螺旋变形 有限元模拟 

分 类 号：TG376[金属学及工艺—金属压力加工]