TY - JOUR
T1 - Redirection of a crack driven by viscous fluid
AU - Perkowska, Monika
AU - Piccolroaz, Andrea
AU - Wrobel, Michal
AU - Mishuris, Gennady
PY - 2017/12/1
Y1 - 2017/12/1
N2 - As shown by Wrobel, Mishuris, and Piccolroaz (2017), the hydraulically induced tangential traction on fracture walls changes local displacement and stress fields. This resulted in the formulation of a new hydraulic fracture (HF) propagation condition based on the critical value of the energy release rate that accounts for the hydraulically-induced shear stress. Therefore it is clear that the crack direction criteria, which depend on the tip distributions of the stress and strain fields, need to be changed. We analyse the two commonly used criteria, one based on the maximum circumferential stress (MCS) and another - on the minimum strain energy density (MSED). We show that the impact of the hydraulically induced shear stress on the direction of the crack propagation is negligible in the case of large material resistance to fracture, while for small toughness the effect is significant. Moreover, values of the redirection angles, corresponding to the so-called viscosity dominated regime (KIC → 0), depend dramatically on the ratios of the stress intensity factors.
AB - As shown by Wrobel, Mishuris, and Piccolroaz (2017), the hydraulically induced tangential traction on fracture walls changes local displacement and stress fields. This resulted in the formulation of a new hydraulic fracture (HF) propagation condition based on the critical value of the energy release rate that accounts for the hydraulically-induced shear stress. Therefore it is clear that the crack direction criteria, which depend on the tip distributions of the stress and strain fields, need to be changed. We analyse the two commonly used criteria, one based on the maximum circumferential stress (MCS) and another - on the minimum strain energy density (MSED). We show that the impact of the hydraulically induced shear stress on the direction of the crack propagation is negligible in the case of large material resistance to fracture, while for small toughness the effect is significant. Moreover, values of the redirection angles, corresponding to the so-called viscosity dominated regime (KIC → 0), depend dramatically on the ratios of the stress intensity factors.
KW - direction of the fracture propagation
KW - hydraulic fracture
KW - toughness dominated regime
KW - viscosity dominated regime
U2 - 10.1016/j.ijengsci.2017.09.009
DO - 10.1016/j.ijengsci.2017.09.009
M3 - Article
SN - 0020-7225
VL - 121
SP - 182
EP - 193
JO - International Journal of Engineering Science
JF - International Journal of Engineering Science
ER -