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SUMMARY:Is Adiabatic Shear Failure really Adiabatic?
DTSTART:20120424T131500
DTEND:20120424T141500
DTSTAMP:20260413T194000Z
UID:f0bf7e9cd33d86fd0f359f32c1f940b0adb9e6db9dfbf59255522f7f
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Daniel Rittel\, Technion - Israel Institute of Technolog
 y\nAdiabatic shear failure is a dynamic failure mechanism that results fro
 m the formation of a localized narrow band in which the shear strain conce
 ntrates and reaches very high values. An early and well accepted analysis 
 of ASB formation relies on the competition between strain-hardening and th
 ermal softening\, so that when the latter overcomes the former\, the mater
 ial can no longer harden and fails by shear localization. Therefore\, the 
 role of thermally induced strain-softening is viewed as central in ASB for
 mation. We propose another approach to the phenomenon\, based on the dynam
 ically stored energy of cold work\, the latter being identified as a key f
 actor for the onset of shear localization. This energy affects and dictate
 s the microstructural re-arrangements (dynamic recrystallization\, twinnin
 g) occurring during dynamic deformation. In this talk\, we will present ex
 perimental results on the evolution of the temperature and the microstruct
 ure of the dynamically sheared material\, and a model describing its evolu
 tion. These results will be discussed to propose another physical explanat
 ion to dynamic shear localization as a microstructure-related instability
LOCATION:ME B3 31 http://plan.epfl.ch/?lang=fr&room=me+b3+31
STATUS:CONFIRMED
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