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A micromorphically regularized Cam-clay model for capturing size-dependent anisotropy of geomaterials

Bryant, Eric Cushman; Sun, WaiChing

We introduce a regularized anisotropic modified Cam-clay (MCC) model which captures the size-dependent anisotropic elastoplastic responses for clay, mudstone, shales, and sedimentary rock. By homogenizing the multiscale anisotropic effects induced by clay particle aggregate, clusters, peds, micro-fabric, and mineral contact across length scales, we introduce two distinctive anisotropic mechanisms for the MCC model at the material point and mesoscale levels. We first employ a mapping that links the anisotropic stress state to a fictitious isotropic principal stress-space to introduce anisotropy at the material point scale. Then, the mesoscale anisotropy is introduced via an anisotropic regularization mechanism. This anisotropic regularization mechanism is triggered by introducing gradient-dependence of the internal variables through a penalty method such that the resultant gradient-enhanced plastic flow may exhibit anisotropic responses non-coaxial to the stress gradient of the yield function. The influence of the size-dependent anisotropy on the formation

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Also Published In

Title
Computer Methods in Applied Mechanics and Engineering
DOI
https://doi.org/10.1016/j.cma.2019.05.003

More About This Work

Academic Units
Civil Engineering and Engineering Mechanics
Published Here
June 14, 2019
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