Authors: O K Mahabadi B E Cottrell G Grasselli
Publish Date: 2010/03/28
Volume: 43, Issue: 6, Pages: 707-716
Abstract
The scope of this study is to numerically simulate the behaviour of Brazilian disc specimens as observed in laboratory during dynamic highstrain rate indirect tensile tests using an innovative combined finitediscrete element method FEM/DEM research code Laboratory experiments using a split Hopkinson pressure bar SHPB apparatus were conducted by the authors and the measured indirect tensile strength values were used to verify the FEM/DEM models In the models the applied boundary conditions related to the loading rate of the specimen were matched with the experimental observations The results of the numerical simulations including tensile strength and failure time are in agreement with the laboratory findings The main failure mechanisms ie tensile splitting along loading axis and shear failure close to loading platens are captured by the numerical model A linear relationship between tensile strength and loading rate is found for the range of dynamic strain rates tested and simulated The simulation results are in good agreement with laboratory observations and demonstrate the potential for using FEM/DEM to realistically model dynamic response of rocksThis work has been supported by NSERC/Discovery Grant No 341275 and NSERC/RTI Grant No 345516 The authors wish to thank Dr Xia and Mr Dai for providing access to their original published data Mr Tatone and Mr Lisjak for the precious help during the preparation of the present manuscript
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