Modelling the dynamic failure of brittle rocks using a hybrid continuum-discrete element method with a mixed-mode cohesive fracture model

A cohesive fracture model that combines tension, compression and shear material behaviour is implemented into the hybrid continuum-discrete element method, i.e. Universal Distinct Element Code (UDEC), to simulate fracturing process in rock dynamic tests. The fracture model considers both elastic and...

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Bibliographic Details
Published inInternational journal of impact engineering Vol. 87; pp. 146 - 155
Main Authors Gui, Yi-Lin, Bui, Ha H., Kodikara, Jayantha, Zhang, Qian-Bing, Zhao, Jian, Rabczuk, Timon
Format Journal Article
LanguageEnglish
Published 01.01.2016
Subjects
Cohesion
Computer simulation
Dynamics
Failure
Fracture mechanics
Mathematical models
Rocks
Shear
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Summary:A cohesive fracture model that combines tension, compression and shear material behaviour is implemented into the hybrid continuum-discrete element method, i.e. Universal Distinct Element Code (UDEC), to simulate fracturing process in rock dynamic tests. The fracture model considers both elastic and inelastic (decomposed to fracture and plastic) displacements, with the norm of the effective inelastic displacement used to control the fracture behaviour. Two numerical examples, including notched semi-circular bending and Brazilian disc tests, are conducted to verify the applicability of the model in simulating the dynamic failure of rocks. Results show that the proposed approach is capable of realistically simulating the load rate effects on the mechanical behaviour of rock materials subjected to dynamic loads.
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ISSN:0734-743X
DOI:10.1016/j.ijimpeng.2015.04.010