循环稳定材料的棘轮行为:I.实验和本构模型  

RATCHETING OF CYCLICALLY STABLE MATERIALS: I. EXPERIMENTS AND A VISCO-PLASTIC CONSTITUTIVE MODEL

作　　者：康国政[1] 高庆[1] 

机构地区：[1]西南交通大学应用力学与工程系,四川成都610031

出　　处：《工程力学》2005年第2期206-211,共6页Engineering Mechanics

基　　金：国家自然科学基金项目(19772041);四川省应用基础基金项目(03JY029-062-2)

摘　　要：在实验分析结果的基础上,对循环稳定材料的室温单轴和非比例多轴循环棘轮行为进行了本构描述,建立了一个简单而合理的、便于工程应用的粘塑性循环棘轮本构模型。给出了模型参数的确定方法,并根据实验获得的单拉应力-非弹性应变关系曲线确定了针对U71Mn 轨道钢材料的参数值。在此基础上,通过对该材料棘轮行为的本构模拟检验了发展模型的预言能力。结果表明,模型具有很好的预测效果,模拟结果与对应的实验结果符合得很好。Based on experimental results, uniaxial and nonproportionally multiaxial ratcheting of cyclically stable materials is described constitutively at room temperature. A new visco-plastic constitutive model feasible for engineering application is established in the framework of unified visco-plasticity. The determination of material parameters used in the model is elaborated in detail, and the values of material parameters for U71Mn rail steel are obtained directly from the experimental inelastic uniaxial tensile stress strain data. The capability of the proposed constitutive model is verified by simulating the corresponding experiments of U71Mn rail steel at room temperature. It is shown that the simulated results are in good agreement with the experimental ones.

关 键 词：棘轮行为 粘塑性 本构模型 非比例加载 室温 

分 类 号：O346[理学—固体力学] TG142.71[理学—力学]