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arXiv 1707.09288cond-mat.mtrl-sci
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颗粒复合材料的流体力学网络模拟

Hydro-mechanical network modelling of particulate composites

Ignatios Athanasiadis, Simon J. Wheeler, Peter Grassl

摘要:

颗粒状准脆性材料中的差异收缩导致微裂纹,微裂纹通过增加它们的质量传输特性而降低这些材料的耐久性。采用流体力学三维周期网络方法研究了颗粒和试样尺寸对试样渗透率的影响。本文研究的颗粒状准脆性材料由刚性弹性颗粒、较软的基体和基体与颗粒之间的界面过渡区组成,表现出非线性材料响应。增量施加均匀本征应变,随着损伤塑性本构模型,被用来描述的矩阵和界面过渡区的收缩和开裂过程。结果表明,在恒定体积分数下增加颗粒直径会增加裂缝宽度,因此增加渗透性,这证实了先前获得的2D建模结果。此外,它被证明,试样厚度相比,颗粒尺寸的影响,渗透率的增加,由于微裂纹的影响很小。

英文摘要:

Differential shrinkage in particulate quasi-brittle materials causes microcracking which reduces durability in these materials by increasing their mass transport properties. A hydro-mechanical three-dimensional periodic network approach was used to investigate the influence of particle and specimen size on the specimen permeability. The particulate quasi-brittle materials studied here consist of stiff elastic particles, and a softer matrix and interfacial transition zones between matrix and particles exhibiting nonlinear material responses. An incrementally applied uniform eigenstrain, along with a damage-plasticity constitutive model, are used to describe the shrinkage and cracking processes of the matrix and interfacial transition zones. The results showed that increasing particle diameter at constant volume fraction increases the crack widths and, therefore, permeability, which confirms previously obtained 2D modelling results. Furthermore, it was demonstrated that specimen thickness has, in comparison to the influence of particle size, a small influence on permeability increase due to microcracking.

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