基于电磁胀环的紫铜高速率本构方程研究  

Study of high velocity constitutive equation of copper based on lectronmagnetic ring expansion

作　　者：李正[1] 胡建华[1] 孟正华[1] 李风[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《锻压技术》2009年第4期156-158,162,共4页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(50875192)

摘　　要：研究了基于电磁成形方法的高速率变形,归纳出高速率电磁成形中材料本构关系是影响材料成形性提高的重要因素。应变率的提高决定了材料本构关系的变化,因此通过基于电磁胀环方法的辅助管电磁胀环实验,在毛坯工件上磁压力载荷分布均一的条件下研究紫铜的高速率本构模型,并在通过应力模型和实验数据的基础上建立紫铜基于电磁胀环的高速率本构方程,最后通过有限元模拟得出该高速率本构比静态本构更能正确模拟毛坯高速率变形过程。High velocity forming was studied based on electromagnetic forming method. It is summarized that the change of constitutive relation is an important factor effecting the material high velocity formability. The strain-rate improvement determines the constitutive change. So the HVF constitutive model of copper was researched based on the electromagnetic ring expansion with accessorial tube method, which had a uniform electromagnetic force and it was setup based on the excessive stress model and the research data. The result of finite element simulation declares that the HVF constitutive model of copper can express rightly about the formability of metals in HVF compared to the constitutive model based on quasi-static forming.

关 键 词：高速率成形 本构关系 紫铜 电磁胀环 高速本构方程 

分 类 号：TG391[金属学及工艺—金属压力加工]