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

Science China(Technological Sciences) 2015年第9期58卷 1587-1595页

作者： ZHAO GaoFeng kazerani tohid MAN Ke GAO Mz ZHAO Jian 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

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： dynamic fracture toughness rock discrete element model friction

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A discontinuum-based model to simulate compressive and tensile failure in sedimentary rock

A discontinuum-based model to simulate compressive and tensi...

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第13届全国岩石动力学学术会议

作者： tohid kazerani Civil Engineering School Faculty of EngineeringUniversity of NottinghamUniversity ParkNottinghamNG9 2NNUK

The study presented in this paper discusses a discontinuum-based model for investigating strength and failure in sedimentary *** model has been implemented by UDEC to incorporate an innovative orthotropic cohesive constitutive law for *** reach this purpose,a user-defined model has been established by creating dynamic link libraries(DLLs) and attaching them into the *** model reproduces rock material by a dense collection of irregular-sized deformable particles interacting at their cohesive boundaries which are viewed as flexible contacts whose stress-displacement law is assumed to control the fracture and the fragmentation behaviours of the *** model has been applied to a *** individual and interactional effects of the microstructural parameters on the material compressive and tensile failure responses have been *** addition,the paper presents a new methodical calibration procedure to fit the modelling *** is shown that the model can successfully reproduce the rock mechanical behaviour quantitatively and *** study also shows how discontinuum-based modelling can be used to characterize the relation between the microstructural parameters and the macro-scale properties of a material.

关键词： Rock microstructure Microparameter Microfracture Orthotropic cohesive interface Discrete element method

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