Nonlinear softening Cosserat continuum model and its application in finite element analysis for strain localization of soils

WEI Wencheng; TANG Hongxiang; LIU Jingmao; ZOU Degao

doi:10.11779/CJGE20230399

Volume 46 Issue 12

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Chinese Journal of Geotechnical Engineering > 2024 > 46(12): 2492-2502. > DOI: 10.11779/CJGE20230399

WEI Wencheng, TANG Hongxiang, LIU Jingmao, ZOU Degao. Nonlinear softening Cosserat continuum model and its application in finite element analysis for strain localization of soils[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(12): 2492-2502. DOI: 10.11779/CJGE20230399

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Nonlinear softening Cosserat continuum model and its application in finite element analysis for strain localization of soils

Dalian University of Technology, State Key Laboratory of Coastal and Offshore Engineering, Dalian 116024, China

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Received Date: May 07, 2023
Available Online: May 29, 2024

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Abstract

Abstract

An innovative approach is introduced to enhance the original soil nonlinear strain softening formula proposed by Ma et al. This formula is incorporated into the DP-MC yield criterion in the framework of Cosserat continuum, and the corresponding return mapping algorithm and consistent elastic-plastic tangent modulus matrix for the integration of constitutive equation are derived. The numerical implementation is realized through the user-defined element subroutine interface (UEL) in the ABAQUS finite element software. The proposed nonlinear softening DP-MC constitutive model for the Cosserat continuum is validated through the numerical modelling of the plane strain tests. The results demonstrate that the proposed model can effectively overcome the mesh-dependent issues of the classical finite element analysis for strain localization due to strain softening in soils. The model also captures the microscopic effects of particle rotation within the shear band. Additionally, the simulation for the plane compression tests highlights the significant impact of the softening coefficient ω and shape parameter η on the strength of soils.
- nonlinear softening,
- shear band,
- strain localization,
- mesh dependency,
- Cosserat continuum

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