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首页> 外文期刊>Journal of Materials Engineering and Performance >Constitutive Model Over Wide Temperature Range and Considering Negative-to-Positive Strain Rate Sensitivity for As-Quenched AA2219 Sheet
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Constitutive Model Over Wide Temperature Range and Considering Negative-to-Positive Strain Rate Sensitivity for As-Quenched AA2219 Sheet

机译：宽温度范围内的本构模型，考虑到淬火AA2219板的负致阳性应变速率敏感性

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摘要

An accurate constitutive model over a wide temperature range is very important for research on the quenching process. In this study, uniaxial tension tests of an as-quenched AA2219 aluminum alloy sheet were first conducted at different strain rates (10(-3)-10(-1)s(-1)) over a wide temperature range (298-773K). The tension results showed an increase in the strain rate sensitivity (SRS) from negative to positive with temperature. Different increasing trends were observed in the low-temperature range (298-473K), high-temperature range (573-773K), and transitive-temperature range (473-573K). In order to more accurately capture these variations in the SRS, the existing function that considers the negative-to-positive SRS was modified by adding a coupling effect term for the temperature and strain rate. The temperature sensitivity increased linearly and exponentially with the strain and temperature, respectively, and also had obviously different tendencies in the low- and high-temperature ranges. The new coupling effect term for the temperature and strain was constructed to consider these effects. Finally, a phenomenological constitutive model was proposed, in which the negative-to-positive SRS and the coupling effects of the strain and temperature were considered. This constitutive model could predict the flow stress of the as-quenched AA2219 with very good correlation over a wide temperature range.
机译：在宽温度范围内的精确构成模型对于对淬火过程的研究非常重要。在该研究中，首先在宽温度范围内以不同的应变率（10（-3）-10（-1））（10（-3）-10（-1））（298-773K）进行单轴张力试验。 ）。张力结果表明，应变速率敏感性（SRS）的增加与负温度为阳性。在低温范围（298-473K），高温范围（573-773K）和透气温度范围（473-573K）中观察到不同的增加趋势。为了更准确地捕获SRS中的这些变化，通过添加温度和应变率的耦合效应项来修改考虑负对SRS的现有功能。温度敏感性分别与应变和温度分别线性且呈指数增加，并且在低温和高温范围内也具有明显不同的趋势。构建温度和菌株的新耦合效应项以考虑这些效果。最后，提出了一种现象学组成型模型，其中考虑了负对阳性的Srs和菌株和温度的偶联效果。该本构体模型可以预测由于宽温度范围内具有非常好的相关性的淬火AA2219的流量应力。

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