Viscous phase-field modeling for chemo-mechanical microstructural evolution: application to geomaterials and pressure solution

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:207

Article

Guevel, A.¹  Rattez, H.¹  Veveakis, E.¹ 

[1] Duke Univ, Dept Civil & Environm Engn, Durham, NC 27706 USA

关键词: Phase-field modeling;    Contact thermodynamics;    Generalized relaxation equation;    Geomaterials;    Chemo-mechanical;    Microstructure;    Pressure solution creep;    Microstructural viscosity;   

DOI  :  10.1016/j.ijsolstr.2020.09.026

来源: Elsevier

【 摘 要 】

The microstructural geometry of materials has a significant influence on their macroscopic response, especially when the process is essentially microscopic as for chemo-mechanical processes. In this work, we are pursuing the idea that interface-tracking models like phase-field modeling can capture the microstructural dynamics and enrich macroscopic constitutive laws for geomaterials. We are introducing a phase-field theory for chemo-mechanical processes derived from fully-dissipative thermodynamics, enabling the inclusion of dissipative effects such as the evolution of the microstructural curvature. The resulting microstructural viscosity introduces rate-dependency through the associated relaxation time. To emphasize the influence of irregular microstructural geometries, we study numerically the chemomechanical response of digitalized geomaterials at the grain scale under pressure solution creep. We show that tracking the grain boundary evolution allows for capturing the microscopic transient nature of pressure solution. Our numerical results are discussed against experimental results from the literature and the properties of macroscopic creep laws are shown to be linked to the evolution of the microstructure. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

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