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首页> 外文期刊>High temperature materials and processes >A New Constitutive Model for AZ31B Magnesium Alloy Sheet Deformed at Elevated Temperatures and Various Strain Rates
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A New Constitutive Model for AZ31B Magnesium Alloy Sheet Deformed at Elevated Temperatures and Various Strain Rates

机译：高温和不同应变速率下变形的AZ31B镁合金薄板的本构模型

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摘要

In this study, a new constitutive model is established for AZ31B magnesium alloy sheet at elevated temperatures and strain rates in order to describe two competing mechanisms for deformation, i.e. both work-hardening and softening stage of AZ31B magnesium alloy sheet. Stress-strain curves obtained by conducting uni-axial tensile tests at elevated and strain rates were first separated at the maximum stress and corresponding strain values. Voce's law was then employed to fit separated hardening and softening stage. A MATLAB tool is used to determine material parameters by using least square fitting method at various temperatures and strain rate. The mergence of separated work-hardening and softening equations is in good agreement with experimental data. The parameters of fitting curves are utilized to determine them as a function of temperature and strain rate using a surface fitting method. The final equation is then implemented to predict stress-strain curves at various temperatures and strain rates. The proposed equation showed the good comparability between the simulation results and the corresponding experiments.
机译：在这项研究中，为描述高温和高应变速率下的AZ31B镁合金薄板建立了一个新的本构模型，以描述两种相互竞争的变形机制，即AZ31B镁合金薄板的加工硬化和软化阶段。通过在升高的应变速率下进行单轴拉伸试验而获得的应力-应变曲线首先在最大应力和相应的应变值下分开。然后采用沃斯定律来拟合分离的硬化和软化阶段。使用MATLAB工具通过在各种温度和应变率下使用最小二乘拟合法来确定材料参数。分离的工作硬化和软化方程的合并与实验数据吻合良好。利用曲面拟合方法，利用拟合曲线的参数确定它们与温度和应变率的关系。然后执行最终方程，以预测各种温度和应变速率下的应力-应变曲线。所提出的方程显示了仿真结果与相应实验之间的良好可比性。

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