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Constitutive modeling of semisolid deformation for the assessment of dilatant shear bands

机译：半固体变形本构模型用于评估剪胀带

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A new constitutive model is proposed to investigate the shear localization in semisolid materials. It is based on the development of a viscosity-type equation to express the homogeneous part of the semisolid flow curve. An instability analysis was performed by examining the necessary condition for the growth of a perturbation in the homogeneous flow. Considering a shear layer model, the necessary condition for perturbation growth and subsequent shear localization was derived. The localization analysis, in conjunction with experimental evidence, results in a new description for the rheology of semisolid materials, involving elasto-viscoplastic deformation at solid skeleton bonds, breaking of the bonds and subsequent granular deformation. Moreover, it was shown that the tendency to localization decreases with increasing liquid fraction at low and modest strain rates. It is shown that the rate sensitivity has a retarding effect on the shear localization. The constitutive model and the shear localization predicted by the presented model were fairly well correlated with the experimental results. (C) 2019 Elsevier Inc. All rights reserved.
机译：提出了一种新的本构模型来研究半固态材料的剪切局部化。它基于粘度类型方程的发展来表示半固体流动曲线的均质部分。通过检查均匀流中扰动增长的必要条件进行了不稳定性分析。考虑剪切层模型，得出了扰动生长和随后剪切局部化的必要条件。本地化分析，结合实验证据，对半固体材料的流变学有了新的描述，包括固体骨架键处的弹粘塑性变形，断裂和随后的颗粒变形。而且，已经表明，在低和中等应变速率下，局部化趋势随着液体分数的增加而降低。结果表明，速率敏感性对剪切局部化具有延迟作用。本模型和本模型预测的剪切局部化与实验结果具有很好的相关性。 （C）2019 Elsevier Inc.保留所有权利。

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