摘要
本文将Hosford 与Hill 各向异性屈服函数应用于刚粘塑性有限元方法,分析了圆形薄板液压胀形过程.研究了材料性能参数:硬化指数n、速率敏感指数m、厚向各向异性参数R、屈服函数非多项式指数M 对液压胀形过程的综合影响.并通过数值分析,找出了临界厚向断裂应变-ε_3^(ov·)与材料参数关系的经验方程式.屈服表面形状对极限厚度应变的影响,可以用Barlat 提出的包含了R 和M 影响的p 值表示出来.
A simulation of a circular clamped membrance free bulging by one-side hydrostatic pressure has beenrealised by a rigid-viscoplastic finite element method with introducing the Hosford and Hill yield function. The synthetical influences of the material parameters including strain hardening exponent(n),strain ratesensitivity(m)and the yield function parameters,R(anisotropic coefficient)and M(non-quadratic expo-nent)on the limit thickness strain of bulging were studied.Based on the numerical analyses,an empiricalequation reflecting the relation between the limit thickness strain and material parameters n and m wasproposed.The influence of yield surface shape on limit thickness strain can be represented by the P-valueproposed by Barlat,in which the effects of Rand Mare included.
出处
《固体力学学报》
CAS
CSCD
北大核心
1993年第1期25-34,共10页
Chinese Journal of Solid Mechanics
基金
国家自然科学基金
关键词
有限元
液压胀形
板材
金属
rigid-viscoplasticity
FEM
hydrostatic bulging
material parameter
