摘要
本文提出了一个考虑材料非比例循环附加强化效应、非比例循环加载历史效应和应变幅值历史效应的粘塑性本构模型．在该模型中，引入了对加载过程中非弹性应变幅值的记忆变量ｑ；定义了新的非比例度；引入了考虑材料非比例度的循环饱和各向同性变形阻力参量Ｑ；对各向同性变形阻力引入了具有先前加载历史记忆的演化方程．将本文模型用于１Ｃｒ１８Ｎｉ９Ｔｉ不锈钢高温循环变形行为描述，其预言结果与实验结果吻合得很好，表明该模型能很好地描述材料的非比例循环加载历史下的循环变形行为．
A viscoplastic constitutive model is introduced, which considers nonproportional cyclic additional hardening and the effects of nonproportional cyclic loading history and inelastic strain amplitude history. In the model, a variable q of memory on the inelastic strain amplitude during loading is introduced, a new nonproportionality is defined, a cyclic saturated isotropic deformation resistance parameter Q is given, and the evolution equations, with the memory on the previous loading history, of the isotropic deformation resistance are proposed. The present model is applied to the description of complex cyclic deformation behavior of 1Cr18Ni9Ti stainless steel, and the predictions are in good agreement with the experimental results. It shows that the model describes the deformation behavior of nonproportional cyclic loadings and their histories very well.
出处
《固体力学学报》
CAS
CSCD
北大核心
1994年第3期261-266,共6页
Chinese Journal of Solid Mechanics
基金
国家自然科学基金
关键词
粘塑性
本构方程
循环加载
流变学
viscoplasticity
constitutive equations
cyclic loading
nonproportional loading
