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

查看全文 作　　者：ZHAO [1,2,3]GaoFeng;KAZERANI [4]Tohid;MAN [5]Ke;GAO [3]Mz;ZHAO [6]Jian

机构地区：[1]State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Civil Engineering, Tianjin University;[2]Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, University of New South Wales;[3]State Key Lab of Hydraulics and Mountain River Engineering, Sichuan University;[4]Civil Engineering School, Faculty of Engineering, University of Nottingham, University Park;[5]Beijing Research Institute of Uranium Geology;[6]Department of Civil Engineering, Monash University

出　　处：《Science China(Technological Sciences)》索引2015年第58卷第9期,共9页

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) 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. 关键词：断裂韧性试验离散元数值模拟弯曲元模型测试测量动态断裂韧性试样厚度

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

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