Non-Saturated Cyclic Hardening of 304 Stainless Steel and Its Constitutive Modeling
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摘要: 针对循环硬化行为的应变幅值依赖性和相对大应变幅值下的非饱和特性,建立了新的粘塑性循环本构模型。在本构模型中,引入新的变量来表征材料的循环硬化特性,该变量的演变方程中引入一个临界状态来反映循环硬化对应变幅值的依赖性;同时,将该变量分解为2个具有不同演变规律的分量,以此来描述相对大应变幅值下的非饱和循环硬化特性。结果表明,新建模型能够很好地描述304不锈钢循环硬化行为的应变幅值依赖性和非饱和特性。Abstract: A visco-plastic constitutive model was proposed to describe the strain-range-dependence and non-saturated property of cyclic hardening observed by experiments.In the proposed model,a new variable was employed to characterize the cyclic hardening.In the evolution rule of the variable,a critical state was introduced to describe the strain-range-dependence of cyclic hardening.Furthermore,the cyclic hardening variable was divided into two parts with different evolution rules so that its non-saturated property presented at relatively large strain amplitude could be described.The cyclic hardening variable is incorporated into the model by considering its effect on kinematic and isotropic hardening evolutions simultaneously.The reasonability of proposed model is verified by comparing the simulations with the corresponding experimental results of 304 stainless steel.
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Key words:
- Constitutive modeling /
- Cyclic hardening /
- Non-saturated property /
- Visco-plasticity
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