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SUMMARY:Ultra-tough metals via high strain-hardening - Professor Thomas Pa
 rdoen\, UCLouvain and WEL Research Institute
DTSTART:20260128T110000Z
DTEND:20260128T120000Z
UID:TALK238576@talks.cam.ac.uk
CONTACT:46601
DESCRIPTION:The toughest engineering materials include stainless steels\, 
 and some high entropy alloys and nickel-based alloys. Their common denomin
 ator is a high strain hardening capacity. In this talk\, we will elucidate
  the origins of this effect by combining micromechanics-based damage model
 ling and fracture testing. The experiments consist in determining the J in
 tegral at cracking initiation Jc\, critical crack tip opening displacement
  dc\, essential work of fracture\, and degree of crack tip necking for dif
 ferent plate thicknesses. The modelling relies on an advanced non-local Gu
 rson type model that is used to simulate crack growth in elastoplastic sol
 ids within a small-scale yielding framework as well as in real fracture me
 chanics specimens. As a first step\, the impact of strain hardening on the
  plane strain toughness is addressed numerically. A high strain hardening 
 capacity is connected to a significant reduction of the magnitude of the p
 lastic strain at a fixed distance from the crack tip\, hence delaying void
  growth and coalescence. 3D crack growth is then simulated and experimenta
 lly characterized in the near plane stress thin plate regime where the tou
 ghness of ductile metals heavily depends on thickness. This dependence is 
 mainly related to the extra dissipation associated to crack tip necking wh
 ich\, itself\, is very much dictated by strain hardening capacity. This st
 udy demonstrates that extreme levels of toughness can be attained by selec
 ting the optimum thickness and a high strain-hardening capacity.
LOCATION:Department of Engineering - LR4
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