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SUMMARY:A continuum theory for the fractures in brittle and ductile solids
  - Luca Cimbaro\, Department of Physics\, Imperial College\, London
DTSTART:20180308T160000Z
DTEND:20180308T170000Z
UID:TALK96430@talks.cam.ac.uk
CONTACT:Stephen Walley
DESCRIPTION:In the physics of fracture\, brittle solids\, such as glass\, 
 suddenly break when a sharp crack grows on the cleavage plane. In contrast
 \, ductile solids\, such as copper\, are soft and resistant to cleavage. I
  will present a continuum theory of fracture in solids\, where the brittle
  and the ductile solids are particular limits. For instance\, in this theo
 ry\, the stress field explains the type of fracture\, while the thermodyna
 mic condition generalises Griffith's equation to include the shielding of 
 the dislocations at the crack-tip. When only the plastic strains determine
  the fracture mechanism\, this thermodynamic condition proves the Orowan-I
 rwin formula. Also\, this theory can be used to solve applied problems\, s
 uch as the embrittlement of nickel-based superalloys at high temperatures.
LOCATION:Mott Seminar Room\, Cavendish Laboratory
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