摘要
在平面各向异性三参数Barlat-Lian屈服准则的基础上加入两个横向剪切应力分量xσz和σyz,提出了一个改进的5参数Barlat-Lian屈服准则,结合BT或BWC壳单元,模拟了板料在成形过程中的各向异性行为.当屈服函数指数M=2时,改进的Barlat-Lian屈服准则可以退化成Hill48屈服准则,当各向异性参数r0=r45=r90=1时,可退化成Von Mises屈服准则.应用自主版权的板料冲压成形快速模拟软件FASTAMP,以圆筒件为例,将模拟结果与试验结果进行比较,验证了改进的Barlat-Lian屈服准则的正确性.
A new five-parameter yield criteria based on the Barlat-Lian three-parameter planar aniso- tropic yield criteria was presented. The new yield criteria in which two transverse shear stresses were added can be combined with BT （Belytschko-Tasy） or BWC （Belytschko-Wong-Chiang） shell elements to simulate the anisotropic characters of the sheet in the stamping. When the exponent M of the yield function equaled two, the new yield criteria reduced to Hi1148 criterion, especially if all the three anisotropic parameters （r0, r45, r90） equaled one, the new yield criteria reduced to Von Mises criterion. Using fast finite element analysis software FASTAMP for sheet metal forming, the validity of the new yield criterion was proved by comparing the numerical results with experimental results of the cylindrical part.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第1期129-132,共4页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(50575080)
关键词
板料成形
数值模拟
各向异性参数
屈服准则
sheet metal forming
numerical simulation
anisotropic parameter
yield criteria
作者简介
柳玉起（1966-），男，教授；武汉，华中科技大学材料成形与模具技术国家重点实验室（430074）．E-mail：fastamp@vip．sina．com.
