Variational self-consistent estimates for viscoplastic polycrystals with highly anisotropic grains

Michael V. Nebozhyn , Pierre Gilormini , Pedro Ponte Castañeda
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引用次数: 26

Abstract

A recently established variational procedure is used to compute self-consistent estimates for viscoplastic polycrystals with highly anisotropic ionic and HCP grains. For large values of the grain anisotropy M, the predictions for the macroscopic flow stress are found to scale as Mγ, where γ depends on the number (less than 5) of independent slip systems that are available for plastic flow, but not on the strain-rate sensitivity. The predictions of other nonlinear extensions of the self-consistent scheme are inconsistent with this scaling law, suggesting that they may be less accurate than the variational estimates proposed here.

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具有高度各向异性晶粒的粘塑性多晶体的变分自洽估计
最近建立的变分程序用于计算具有高各向异性离子和HCP晶粒的粘塑性多晶体的自一致估计。对于较大的晶粒各向异性M,宏观流变应力的预测可以用Mγ来表示,其中γ取决于可用于塑性流动的独立滑移系统的数量(小于5),而不取决于应变率敏感性。自洽格式的其他非线性扩展的预测与该标度律不一致,表明它们可能不如本文提出的变分估计准确。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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