Fracture Initiation and Propagation in a Brazilian Disc with a Plane Interface: a Numerical Study
 M. Cai
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In the present study, fracture initiation and propagation from a preexisting plane interface in a Brazilian disc is investigated using a finitediscrete element combined method. Different fracture patterns, depending on the frictional resistance of the preexisting crack or interface, are observed from the numerical simulation. It is found that when there is no or very little frictional resistance on the surfaces of the preexisting crack, the primary fractures (wing cracks), which are tensile in nature and are at roughly right angles to the preexisting crack, start from the tips of the preexisting crack. As the friction coefficient increases, the wing cracks’ initiation locations deviate from the crack tips and move toward the disc center. Secondary fractures, which are also tensile in nature, initiate from the disc boundary and occur only when the length of the preexisting crack is sufficiently long. The secondary fractures are roughly subparallel to the preexisting crack. The failure load is found to be influenced by the friction coefficient of the preexisting crack. A 38 % failure load increase can result when the friction coefficient changes from 0 to 1. A good understanding of the fracture initiation and propagation in the forms of primary and secondary fractures provides insight into explaining some fracture patterns observed underground.
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 Title
 Fracture Initiation and Propagation in a Brazilian Disc with a Plane Interface: a Numerical Study
 Journal

Rock Mechanics and Rock Engineering
Volume 46, Issue 2 , pp 289302
 Cover Date
 20130301
 DOI
 10.1007/s0060301203311
 Print ISSN
 07232632
 Online ISSN
 1434453X
 Publisher
 Springer Vienna
 Additional Links
 Topics
 Keywords

 Fracture initiation
 Fracture propagation
 Brazilian test
 FEM/DEM combined method
 Shear fracture
 Tensile fracture
 Industry Sectors
 Authors

 M. Cai ^{(1)}
 Author Affiliations

 1. Bharti School of Engineering, Laurentian University, Sudbury, ON, Canada