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首页> 外文期刊>Journal of Materials Engineering and Performance >Constitutive Modeling for Hot Deformation Behavior of Al-5083+SiC Composite
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Constitutive Modeling for Hot Deformation Behavior of Al-5083+SiC Composite

机译：AL-5083 + SIC复合材料的热变形行为本构模拟

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摘要

In the present research, isothermal hot deformation behavior of aluminum 5083 alloy+15 (wt.%) SiC composite was obtained through compression test on INSTRON 8801 universal tensile testing machine (UTM) under a wide temperature range of 473-773K and strain rate range of 0.01-10s(-1). The experimental true stress-strain data were employed to establish constitutive equations based on modified Johnson-Cook (JC) model and modified Zerilli-Armstrong (ZA) model to predict the hot flow behavior of the composite. The flow stress values obtained from these two models were plotted against the experimental flow curves to check the accuracy of these models. Suitability of the models was evaluated by comparing correlation coefficient (R), average absolute relative error and relative errors of prediction. The results show that the hot flow stresses of the present material depend on temperature and strain rate significantly. Both the models give good description of the hot deformation behavior of the composite. The prediction accuracy is found to be higher for modified ZA model compared to modified JC model, though the number of materials constants involved and time needed to evaluate them to establish the model are lower for modified JC model.
机译：在本研究中，通过在473-773K的宽温度范围内的Instron 8801通用拉伸试验机（UTM）上的压缩试验获得了铝5083合金+ 15（wt.％）SiC复合材料的等温热变形行为。 0.01-10s（-1）。实验真正的应力 - 应变数据被采用基于改进的Johnson-Cook（JC）模型和改进的Zerilli-Armstrong（ZA）模型来建立基于改进的Johnson-Cook（JC）模型的本构方程来预测复合材料的热流行为。从这两个模型获得的流应力值被绘制在实验流程曲线上，以检查这些模型的精度。通过比较相关系数（R），平均绝对相对误差和预测相对误差来评估模型的适用性。结果表明，本材料的热流应力显着取决于温度和应变速率。两种模型都提供了对复合材料的热变形行为的良好描述。与修改的JC模型相比，对修改的ZA模型的预测精度较高，但是修改JC模型所涉及的材料常数数量和时间所需的时间较低。

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