The propagation of a single shear crack: A displacement discontinuity model |
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| Authors: | J -Cl De Bremaecker K Wei |
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| Institution: | (1) Department of Geology and Geophysics, Rice University, Box 1892, 77251 Houston, TX, USA |
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| Abstract: | Numerical studies using the displacement discontinuity method show that a single shear crack under compression propagates in its own direction, because such propagation results in the maximum release of strain energy. The methods of linear elastic fracture mechanics may not be used for such a closed crack, and the stress intensity factors are meaningless in that case. Laboratory observations of propagation by means of  kinks at an angle of approximately 70° to the crack may be due to heterogeneities, to the effect of a preexisting crack, to end effects, to microcracking, or to some combination of these factors. Such kinks may thus be local phenomena which cannot release most of the strain energy, and are not incompatible with our numerical results which are based on a global energy balance. |
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| Keywords: | Crack propagation fracture propagation boundary element method |
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