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SUMMARY:Crack front instability in mode i+iii: experimental and theoretica
 l approaches - Professor Jean-Baptiste Leblond\, Institut Jean Le Rond d
 ’Alembert\, Universite Pierre et Marie Curie (Paris VI)\, French Academy
  of Sciences
DTSTART:20110218T140000Z
DTEND:20110218T150000Z
UID:TALK28573@talks.cam.ac.uk
CONTACT:Ms Helen Gardner
DESCRIPTION:Experimental observations of crack front instability in mode I
 +III are first recalled. A theoretical linear stability analysis of the ph
 enomenon is then presented. This analysis relies on (i) formulae providing
  the exact first-order expression of the local stress intensity factors al
 ong the front\, after from some arbitrary perturbation of the surface and 
 front of the crack\; and (ii) a double criterion combining a Griffith-like
  condition and Goldstein and Salganik’s principle of local symmetry. It 
 is shown that the coplanar configuration of the crack is unstable when the
  ratio of the mode III to mode I unperturbed stress intensity factors exce
 eds a certain threshold depending on Poisson’s ratio.
LOCATION:Oatley Seminar Room\, Department of Engineering
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