Numerical study of the semi-circular bend dynamic fracture toughness test using discrete element models

作     者：ZHAO GaoFeng KAZERANI Tohid MAN Ke GAO Mz ZHAO Jian 

作者机构：State Key Laboratory of Hydraulic Engineering Simulation and Safety School of Civil Engineering Tianjin University Centre for Infrastructure Engineering and Safety School of Civil and Environmental Engineering University of New South Wales State Key Lab of Hydraulics and Mountain River Engineering Sichuan University Civil Engineering School Faculty of Engineering University of Nottingham University Park Beijing Research Institute of Uranium Geology Department of Civil Engineering Monash University 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2015年第58卷第9期

页      面：1587-1595页

核心收录：

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

基　　金：supported by the Australian Research Council(Grant No.DE130100457) State Key Laboratory of Hydraulics and Mountain River Engineering(SKHL)(Grant No.SKHL1407) the National Natural Science Foundation of China(Grant Nos.41202207,51204112 and 2015JY0045) 

主　　题：dynamic fracture toughness rock discrete element model friction 

摘      要：The semi-circular bend(SCB) dynamic fracture toughness test is simulated using discrete element models. The influence of the frictional boundary condition, constitutive law and specimen thickness on the test measurements is investigated. It is found that friction between loading plates and the rock specimen affects the test results. Therefore, friction must be carefully considered to obtain accurate measurements. The simulation results also show that in contrast to the 2D model in which a rate-dependent cohesive law must be introduced, 3D models with a rate-independent law can produce good results. Furthermore, the study suggests that test measurements are seriously affected by specimen thickness; thus, full 3D modeling is required for simulation of the SCB test.