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SUMMARY:Impact of the hydraulically induced shear stress on hydraulic frac
 ture - Gennady Mishuris (Aberystwyth University)
DTSTART:20171206T143000Z
DTEND:20171206T153000Z
UID:TALK96646@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:A revised model of the hydraulic fracture (HF) formulation [1]
  that accounts for the hydraulically induced shear stress at the crack fac
 es is discussed. It is shown that\, due to the order of the tip singularit
 y of the hydraulic shear stress\, this component of the load cannot be omi
 tted in the analysis. The amended crack propagation criterion based on the
  critical value of the energy release rate is derived. A new parameter\, t
 he fluid shear stress intensity factor\, is introduced and has proved to p
 lay an important role in the HF process. It is also shown that the shear s
 tress induced by viscous fluid at the crack faces influences the crack pro
 pagation direction in the mixed mode fracture [2].   Numerical simulations
  have highlighted advantages of the revised HF model. In particular\, the 
 small toughness regime is no longer presents a significant computational c
 hallenge. The modified formulation opens new ways not only to analyse the 
 physical phenomenon of HF\, but for improving the reliability and efficien
 cy of its numerical simulation as well.  <span>[1] Wrobel\, M.\, Mishuris\
 , G.\, Piccolroaz\, A. 2017. Energy release rate in hydraulic fracture: Ca
 n we neglect an impact of the hydraulically induced shear stress? <i>Inter
 national Journal of Engineering Science.</i> 111 pp. 28-51.</span>  <span>
 [2] Perkowska\, M.\, Piccolroaz\, A.\, Wrobel\, M.\, Mishuris\, G. 2017. R
 edirection of a crack driven by viscous fluid. <i>International Journal of
  Engineering Science</i> 121 pp. 182-193.</span>  <br><br><br><br>
LOCATION:Seminar Room 1\, Newton Institute
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