Title:
Self-consistent micromechanical approach for damage accommodation in rock-like polycrystalline materials

dc.contributor.author Pouya, Ahmad
dc.contributor.author Zhu, Cheng
dc.contributor.author Arson, Chloé
dc.contributor.corporatename Laboratoire Navier en_US
dc.contributor.corporatename Georgia Institute of Technology. School of Civil and Environmental Engineering en_US
dc.contributor.corporatename Rowan University. Department of Civil and Environmental Engineering en_US
dc.date.accessioned 2017-11-27T14:01:51Z
dc.date.available 2017-11-27T14:01:51Z
dc.date.issued 2017
dc.description.abstract In quasi-brittle polycrystalline materials, damage by cracking or cleavage dominates plastic and viscous deformation. This paper proposes a micromechanical model for rock-like materials, incorporating the elastic-damage accommodation of the material matrix, and presents an original method to solve the system of implicit equations involved in the formulation. A self-consistent micromechanical approach is used to predict the anisotropic behavior of a polycrystal in which grain inclusions undergo intragranular damage. Crack propagation along planes of weakness with various orientation distributions at the mineral scale is modeled by a softening damage law and results in mechanical anisotropy at the macroscopic scale. One original aspect of the formulated inclusionmatrix model is the use of an explicit expression of the Hill’s tensor to account for matrix ellipsoidal anisotropy. To illustrate the model capabilities, a uniaxial compression test was simulated for a variety of polycrystals made of two types of mineral inclusions with each containing only one plane of weakness. Damage always occurred in only one mineral type: the damaging mineral was that with a smaller shear modulus (respectively higher bulk modulus) when bulk modulus (respectively shear modulus) was the same. For two minerals with the same shear moduli but different bulk moduli, the maximum damage in the polycrystal under a given load was obtained at equal mineral fractions. However, for two minerals with different shear moduli, the macroscopic damage was not always maximum when the volume fraction of two minerals was the same. When the weakness planes’ orientations in the damaging mineral laid within a narrow interval close to the loading direction, the macroscopic damage behavior was more brittle than when the orientations were distributed over a wider interval. Parametric studies show that upon proper calibration, the proposed model can be extended to understand and predict the micro-macro behavior of different types of quasi-brittle materials. en_US
dc.identifier.citation A. Pouya, C. Zhu, C. Arson, 2017. Self-consistent micromechanical approach for damage accommodation in rock-like polycrystalline materials, International Journal of Damage Mechanics, accepted. en_US
dc.identifier.uri http://hdl.handle.net/1853/58998
dc.publisher Georgia Institute of Technology en_US
dc.subject Polycrystal en_US
dc.subject Ellipsoidal anisotropy en_US
dc.subject Micromechanics en_US
dc.subject Self-consistent method en_US
dc.subject Numerical simulation en_US
dc.title Self-consistent micromechanical approach for damage accommodation in rock-like polycrystalline materials en_US
dc.type Text
dc.type.genre Pre-print
dspace.entity.type Publication
local.contributor.author Arson, Chloé
local.contributor.author Zhu, Cheng
local.contributor.corporatename School of Civil and Environmental Engineering
local.contributor.corporatename College of Engineering
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relation.isAuthorOfPublication d28f1a84-f07d-40ec-bed3-60bc4c140551
relation.isOrgUnitOfPublication 88639fad-d3ae-4867-9e7a-7c9e6d2ecc7c
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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