Here 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 of the shear band and the macroscopic responses of the effective media are analyzed in 2D and 3D numerical examples.
Bryant, Eric C. and Sun, WaiChing. "A micromorphically regularized Cam-clay model for capturing size-dependent anisotropy of geomaterials." Computer Methods in Applied Mechanics and Engineering, vol. 354, no. C, May. 2019. https://doi.org/10.1016/j.cma.2019.05.003
Bryant, Eric C., & Sun, WaiChing (2019). A micromorphically regularized Cam-clay model for capturing size-dependent anisotropy of geomaterials. Computer Methods in Applied Mechanics and Engineering, 354(C). https://doi.org/10.1016/j.cma.2019.05.003
Bryant, Eric C., and Sun, WaiChing, "A micromorphically regularized Cam-clay model for capturing size-dependent anisotropy of geomaterials," Computer Methods in Applied Mechanics and Engineering 354, no. C (2019), https://doi.org/10.1016/j.cma.2019.05.003
@article{osti_1613925,
author = {Bryant, Eric C. and Sun, WaiChing},
title = {A micromorphically regularized Cam-clay model for capturing size-dependent anisotropy of geomaterials},
annote = {Here 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 of the shear band and the macroscopic responses of the effective media are analyzed in 2D and 3D numerical examples.},
doi = {10.1016/j.cma.2019.05.003},
url = {https://www.osti.gov/biblio/1613925},
journal = {Computer Methods in Applied Mechanics and Engineering},
issn = {ISSN 0045-7825},
number = {C},
volume = {354},
place = {United States},
publisher = {Elsevier},
year = {2019},
month = {05}}
Air Force Office of Scientific Research (AFOSR); Army Research Office (ARO); National Science Foundation (NSF); USDOE; USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)
Grant/Contract Number:
NE0008534
OSTI ID:
1613925
Alternate ID(s):
OSTI ID: 1565983
Journal Information:
Computer Methods in Applied Mechanics and Engineering, Journal Name: Computer Methods in Applied Mechanics and Engineering Journal Issue: C Vol. 354; ISSN 0045-7825
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 374, Issue 2066https://doi.org/10.1098/rsta.2015.0170