摘要
以位错动力学理论中的Ｏｒｗａｎ和Ｇｉｌｍａｎ关系为基础建立描述率相关材料非弹性响应的基本方程，选择材料准静态实验的单轴响应作为强化演化的规律，并考虑应变率敏感程度随变形产生变化的特性，建立了适用于大应变率范围内率相关材料的统一型粘塑性本构模型。对铝１１００－０在应变率范围１０－５～１０４ｓ－１内产生的有限塑性应变的单轴响应进行了理论预测，与Ｋｈａｎ和Ｈｕａｎｇ［１］的实验数据及模型预测结果进行了比较，结果表明本文模型具有较高的预测精度，在高应变率和较大应变下不容忽视率敏感参数随变形的变化。
Based on the Orwan and Gilmans equations of dislocation dynamics, this paper proposed a viscoplastic constitutive model to represent the strain hardening behavior of materials over a wide range of strain rates. The evolution of the isotropic hardening state variable is considered to be associated with the uniaxial quasi static response of the stress and the strain rate sensitive parameter is assumed as a function of deformation. Compared with the experimental results by Khan and Huang the predictions of the proposed model, show good agreement and demonstrating the capability of the present model.
出处
《应用力学学报》
EI
CAS
CSCD
北大核心
1997年第3期29-33,共5页
Chinese Journal of Applied Mechanics
关键词
应变率敏感性
有限应变
粘塑性
本构关系
strain rate sensitivity, finite strain, viscoplastic constitutive equations.
