有限变形下的后继屈服面演化规律研究  

A STUDY ON THE EVOLUTION OF SUBSEQUENT YIELD SURFACES WITH FINITE DEFORMATION

作　　者：付强[1] 刘芳[1] 陈岑[1] 梁乃刚[1] 

机构地区：[1]中国科学院力学研究所非线性力学国家重点实验室,北京100190

出　　处：《工程力学》2011年第11期23-30,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(10572140;10721202)

摘　　要：有限变形下的后继屈服面会出现膨胀或收缩,移动和畸变等变形特征。基于塑性变形的滑移机制,建立了适用于有限变形条件下的多晶塑性本构模型。提出了一种混合硬化假设,可以一致描述后继屈服面演化中的等向、运动和畸变硬化以及正或负交叉效应、包氏效应等。预测了2种加工硬化铝合金(Al6061-T6511和annealed1100Al)分别在单轴拉伸和纯扭转下的后继屈服面演化过程,与已有实验结果符合一致。The subsequent yield surfaces after a finite deformation show expansion or contraction, translationand distortion. Based on the slip mechanism, a plastic constitutive model for polycrystalline metals with a finite deformation is proposed. A mixed hardening model is developed in the present paper to describe the isotropic hardening, kinematic hardening, distortional hardening, positive or negative cross-effect and Bauschinger effect characterized by the evolution of subsequent yield surfaces. Numerical simulations of the evolution of yield surfaces are performed under tension and pure torsion at various levels of straining for two kinds of work hardening aluminum alloys （A16061-T6511 and annealed 1100A1）. The results show that the agreement between the predictions and experiments is quite satisfactory.

关 键 词：有限变形 多晶塑性本构模型 后继屈服面演化 混合硬化 低/高加工硬化铝合金 

分 类 号：O344.1[理学—固体力学]