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SUMMARY:Energy release rate in hydraulic fracture: Can we neglect an impac
 t of the hydraulically induced shear stress? - Professor Gennady Mishuris\
 , Aberystwyth
DTSTART:20170309T113000Z
DTEND:20170309T123000Z
UID:TALK69565@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:We discuss a novel model of hydraulic fracture (HF) formulatio
 n which accounts for the hydraulically induced shear stress at the crack f
 aces. It utilizes a general form of the elasticity operator alongside a re
 vised fracture propagation condition based on the critical value of the en
 ergy release rate. \n\nWe show that the revised formulation is always in a
 greement with the linear elastic fracture mechanics. Furthermore\, our num
 erical simulations have highlighted advantages of the revised HF model in 
 comparison with those which fail to account for the shear stress. In parti
 cular\, we found that the small toughness regime no longer presents a sign
 ificant computational challenge. The modified formulation opens new ways t
 o analyse the physical phenomenon of HF\, as well as improving the reliabi
 lity and efficiency of its numerical simulation.
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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