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SUMMARY:MEchanics GAthering -MEGA- Seminar: Quasi-static and dynamic crack
  front deformations in cohesive materials
DTSTART:20220602T161500
DTEND:20220602T173000
DTSTAMP:20260920T164839Z
UID:4fbea069446f9fb7d0a080d24a71584dc44dc26f0661e9ff17acf1e5
CATEGORIES:Conferences - Seminars
DESCRIPTION:Thibault Didier Roch (LSMS\, EPFL)\nAbstract When a crack int
 eracts with material heterogeneities\, its front distorts and adopts compl
 ex tortuous configurations that are reminiscent of the energy barriers enc
 ountered during crack propagation. As such\, the study of crack front defo
 rmations is key to rationalize the effective failure properties of micro-s
 tructured solids and interfaces\, and help predict out of plane damage. Cu
 rrent models neglect the influence of a finite dissipation length-scale be
 hind the  crack tip\, called the process zone size. We derive the equatio
 n ruling 3D dynamic coplanar crack propagation in heterogeneous cohesive m
 aterials where the opening of the crack is resisted by some traction in it
 s wake\, and support this theoretical framework with extensive fully dynam
 ic numerical simulations. We show that the process zone introduces scale e
 ffects in the deformations of the crack front. They influence the front de
 formations as well as their stability when interacting with tough obstacle
 s. In the case of fast cracks\, these effects are mitigated by the dynamic
  of the crack itself due to the dynamic stiffening of the front and the Lo
 rentz contraction of the process zone. Overall\, our theory provides a uni
 fied framework to predict the variety of front profiles even when the smal
 l-scale yielding hypothesis of linear elastic fracture mechanics breaks do
 wn.\n\nBio Thibault is a PhD candidate at the Computational Solid Mechani
 cs Laboratory. He received his Master in Civil Engineering from EPFL. His 
 research focuses on dynamic rupture: he is interested in the behavior of f
 rictional interfaces and in heterogeneous dynamic fracture\, in particular
  the deformation of cracks fronts. His research is mainly conducted using 
 numerical simulations\, and he is involved in developing and releasing Ope
 n Source Software.
LOCATION:MED 2 2423 https://plan.epfl.ch/?room==MED%202%202423 https://epf
 l.zoom.us/j/64863509346?pwd=RGlkWjRGOVVSaXZxdFdrb3duYy9mZz09
STATUS:CONFIRMED
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