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首页> 外文期刊>Journal of Materials Engineering and Performance >Cyclic Plasticity Constitutive Model for Uniaxial Ratcheting Behavior of AZ31B Magnesium Alloy
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Cyclic Plasticity Constitutive Model for Uniaxial Ratcheting Behavior of AZ31B Magnesium Alloy

机译：AZ31B镁合金单轴棘轮行为的循环塑性本构模型

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摘要

Investigating the ratcheting behavior of magnesium alloys is significant for the structure's reliable design. The uniaxial ratcheting behavior of AZ31B magnesium alloy is studied by the asymmetric cyclic stress-controlled experiments at room temperature. A modified kinematic hardening model is established to describe the uniaxial ratcheting behavior of the studied alloy. In the modified model, the material parameter m(i) is improved as an exponential function of the maximum equivalent stress. The modified model can be used to predict the ratcheting strain evolution of the studied alloy under the single-step and multi-step asymmetric stress-controlled cyclic loadings. Additionally, due to the significant effect of twinning on the plastic deformation of magnesium alloy, the relationship between the material parameter m(i) and the linear density of twins is discussed. It is found that there is a linear relationship between the material parameter m(i) and the linear density of twins induced by the cyclic loadings.
机译：研究镁合金的棘轮行为对于结构的可靠设计具有重要意义。通过室温下非对称循环应力控制实验研究了AZ31B镁合金的单轴棘轮行为。建立了改进的运动硬化模型来描述所研究合金的单轴棘轮行为。在修改的模型中，材料参数m（i）作为最大等效应力的指数函数得到了改善。修改后的模型可以用来预测合金在单步和多步非对称应力控制循环载荷下的棘轮应变演化。另外，由于孪晶对镁合金塑性变形的显着影响，讨论了材料参数m（i）与孪晶的线密度之间的关系。发现材料参数m（i）与循环载荷引起的孪晶的线性密度之间存在线性关系。

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