Redirection of a crack driven by viscous fluid

Monika Perkowska, Andrea Piccolroaz, Michal Wrobel, Gennady Mishuris

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12 Citations (SciVal)
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Abstract

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.
Original languageEnglish
Pages (from-to)182-193
Number of pages12
JournalInternational Journal of Engineering Science
Volume121
Early online date13 Oct 2017
DOIs
Publication statusPublished - 01 Dec 2017

Keywords

  • direction of the fracture propagation
  • hydraulic fracture
  • toughness dominated regime
  • viscosity dominated regime

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