New Strain Energy–Based Coupled Elastoplastic Damage-Healing Formulations Accounting for Effect of Matric Suction during Earth-Moving Processes
Publication: Journal of Engineering Mechanics
Volume 139, Issue 2
Abstract
Innovative initial elastic strain energy–based coupled elastoplastic hybrid isotropic damage and healing models for partially saturated soils have been developed and implemented for numerical simulation of two-dimensional earth-pushing processes. A class of elastoplastic constitutive damage-healing models, based on a continuum thermodynamic framework, is proposed within an initial elastic strain energy–based formulation. In particular, the change of effective stress caused by matric suction in the formulation is considered, and the governing incremental damage and healing evolutions are coupled and characterized through the effective stress concept in conjunction with the hypothesis of strain equivalence. Further, plastic flow is introduced by means of an additive split of the stress tensor. In this innovative formulation, two characteristic energy norms of the tensile and compressive strain tensors, respectively, are introduced for the corresponding damage and healing mechanisms. By incorporating a micromechanics-motivated damage characterization () and a healing characterization (), the proposed model and computational algorithms have been implemented to demonstrate the significant flexibility on numerical simulation of earth-pushing processes. Completely new computational algorithms are systematically developed based on the two-step operator splitting methodology. The elastic-damage-healing predictor and the plastic corrector are implemented within the existing reproducing kernel particle method mesh-free codes. A numerical example under soil pushing is presented to illustrate the effect of matric suction for partially saturated soils or granular materials.
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Acknowledgments
This work was sponsored in part by the Faculty Research Grant of the Academic Senate of University of California–Las Angeles under Grant No. 4-592565-19914 (principal investigator, J. W. Ju) and in part by Bellagio Engineering (principal investigator, J. W. Ju). We thank Dr. Pai-Chen Guan and Prof. J.S. Chen for assistance in implementing the proposed model into the nonlinear mesh-free analysis program (NMAP) mesh-free code by Chen (2001).
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Published In
Journal of Engineering Mechanics
Volume 139 • Issue 2 • February 2013
Pages: 188 - 199
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Oct 20, 2011
Accepted: May 14, 2012
Published online: May 16, 2012
Published in print: Feb 1, 2013
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