DEM investigation of macro-and micro-mechanical properties of rigid-grain and soft-chip mixtures

作     者：Junqi Zhang Xiaobin Chen Jiasheng Zhang Peerapong Jitsangiam Xiang Wang Junqi Zhang;Xiaobin Chen;Jiasheng Zhang;Peerapong Jitsangiam;Xiang Wang

作者机构：Central South UniversitySchool of Civil EngineeringChangshaHunanChina Chiang Mai UniversityDepartment of Civil EngineeringChiang MaiThailand 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2021年第19卷第2期

页      面：128-139页

核心收录：

学科分类：08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：This research was supported by the Doctoral Fund of Central South University(grant number 1053320170862) National Nat-ural Science Foundation of China(grant number 51678575) the Science Foundation of CARS(grant number 2019YJ026) The authors express their appreciation for the financial assistance. 

主　　题：Rubber chips Rigid-soft mixtures Micro-mechanical properties Triaxial test Discrete element method 

摘      要：We investigated the macro-and micro-mechanical properties of rigid-grain and soft-chip mixtures(GCMs)through numerical simulations using the discrete element method.We present a novel framework for the discrete modeling of soft chips and rigid grains in conjunction with calibration processes.Several numerical triaxial tests were also performed on GCMs with 0%,10%,20%,and 30%volumetric chip contents,P.The simulation results demonstrate that increasing P leads to higher GCM toughness,higher deviatoric peak stress,and higher corresponding shear strain.Higher P also contributes to more volume contraction and less dilation.The friction angles at both the peak and residual state significantly increase with increasing P.In view of the micro-mechanical features,strong contact force chains develop along the loading direction,which results in considerable anisotropy in the peak and residual states.Both the formation of strong force chains and rotation of grains decrease with increasing P,whereas the grain sliding percentage increases.The tensile force is mobilized with shearing and higher P leads to less mobilization of the tensile force.These findings are useful for better understanding the internal structure of GCMs with different soft-chip contents,especially in granular mixture mechanics and geomechanics.