岩土工程学报2024，Vol.46Issue(12)：2492-2502,11.DOI:10.11779/CJGE20230399
非线性软化Cosserat连续体模型及其在土体应变局部化有限元分析中的应用
Nonlinear softening Cosserat continuum model and its application in finite element analysis for strain localization of soils
摘要
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.关键词
非线性软化/剪切带/应变局部化/网格依赖性/Cosserat连续体Key words
nonlinear softening/shear band/strain localization/mesh dependency/Cosserat continuum分类
建筑与水利引用本文复制引用
韦文成,唐洪祥,刘京茂,邹德高..非线性软化Cosserat连续体模型及其在土体应变局部化有限元分析中的应用[J].岩土工程学报,2024,46(12):2492-2502,11.基金项目
国家自然科学基金项目(51979025) （51979025）
