Hydro-mechanical network modelling of particulate composites

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:130

Article

Athanasiadis, Ignatios¹  Wheeler, Simon J.¹  Grassl, Peter¹ 

[1] Univ Glasgow, Sch Engn, Glasgow, Lanark, Scotland

关键词: Microcracking;    Particulate composites;    Aggregate restrained shrinkage;    Mass transport;    Lattice;    Hydro-mechanical;    Network model;    Periodic boundary conditions;   

DOI  :  10.1016/j.ijsolstr.2017.10.017

来源: Elsevier

【 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. (C) 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license.

【 授权许可】

Free