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Zerilli-Armstrong(Z-A)模型是基于热激活位错运动理论建立的具有物理理论基础的本构模型,但是模型建立的初始假设,降低了其预测精度.为此通过引入考虑应变率和温度耦合效应的应变强化指数对Z-A模型进行修正,拓展了其适用范围,并将修正后的Z-A模型应用于描述IC10合金在不同温度和应变率条件下的塑性流变行为.与修正前Z-A模型的预测结果及试验结果比较表明:修正后Z-A模型的预测精度有较大程度的提高,最大平均相对误差值从6.41%降低到3.65%.
The Zerilli-Armstrong (ZA) model is a constitutive model based on the theory of heat-activated dislocation motion, but the initial assumption of model establishment reduces the prediction accuracy. Therefore, by introducing the effect of strain rate and temperature coupling Strain hardening index to modify the ZA model and expand its scope of application.The modified ZA model is applied to describe the plastic rheological behavior of IC10 alloy under different temperature and strain rate conditions.Compared with the prediction results of ZA model before correction The experimental results show that the accuracy of the revised ZA model is improved to a great extent, and the maximum average relative error is reduced from 6.41% to 3.65%.