Finite Element Simulations on Failure Behaviors of Granular Materials with Microstructures Using a Micromechanics-Based Cosserat Elastoplastic Model

作     者：Chenxi Xiu Xihua Chu 

作者机构：School of Civil EngineeringChongqing Jiaotong UniversityChongqing400074China School of Civil EngineeringWuhan UniversityWuhan430072China 

出 版 物：《Computer Modeling in Engineering & Sciences》 (工程与科学中的计算机建模（英文）)

年 卷 期：2024年第138卷第3期

页      面：2305-2338页

核心收录：

学科分类：08[工学] 0701[理学-数学] 080102[工学-固体力学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：the National Natural Science Foundation of China through Contract/Grant Numbers 12002245,12172263 and 11772237 Chongqing Jiaotong University through Contract/Grant Number F1220038 

主　　题：Granular materials micromechanics Cosserat elastoplastic model microstructures failure behaviors 

摘      要：This paper presents a micromechanics-based Cosserat continuum model for microstructured granular *** utilizing this model,the macroscopic constitutive parameters of granular materials with different microstructures are expressed as sums of microstructural *** microstructures under consideration can be classified into three categories:a medium-dense microstructure,a dense microstructure consisting of one-sized particles,and a dense microstructure consisting of two-sized ***,the Cosserat elastoplastic model,along with its finite element formulation,is derived using the extended Drucker-Prager yield *** investigate failure behaviors,numerical simulations of granular materials with different microstructures are conducted using the ABAQUS User Element(UEL)*** demonstrates the capacity of the proposed model to simulate the phenomena of strain-softening and strain *** study investigates the influence of microscopic parameters,including contact stiffness parameters and characteristic length,on the failure behaviors of granularmaterials ***,the study examines themesh independence of the presented model and establishes its relationship with the characteristic length.A comparison is made between finite element simulations and discrete element simulations for a medium-dense microstructure,revealing a good agreement in results during the elastic *** parameters describing plasticity are shown to be partially related to microscopic factors such as confining pressure and size of the representative volume element.