Micromechanical model for cohesive materials based upon pseudo-granular structure

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:47

Article

Misra, Anil¹  Yang, Yang^1,2 

[1] Univ Kansas, Dept Civil Environm & Architectural Engn, Lawrence, KS 66045 USA

[2] China Univ Geosci, Fac Engn, Wuhan 430074, Hubei, Peoples R China

关键词: Micromechanics;    Failure surface;    Cohesive materials;    Multi-scale modeling;    Granular media;   

DOI  :  10.1016/j.ijsolstr.2010.07.002

来源: Elsevier

【 摘 要 】

A micromechanical model for cohesive materials is derived by considering their underlying microstructure conceptualized as a collection of grains interacting through pseudo-bonds. The pseudo-bond or the inter-granular force-displacement relations are formulated taking inspiration from the atomistic-level particle interactions. These force-displacement relationships are then used to derive the incremental stiffnesses at the grain-scale, and consequently, obtain the sample-scale stress-strain relationship of a representative volume of the material. The derived relationship is utilized to study the stress-strain and failure behavior including the volume change and brittle to ductile transition behavior of cohesive materials under multi-axial loading condition. The model calculations are compared with available measured data for model validation. Model predictions exhibit both quantitative and qualitative consistency with the observed behavior of cohesive material. (C) 2010 Elsevier Ltd. All rights reserved.

【 授权许可】

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