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PRODID:-//Memento EPFL//
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SUMMARY:Peeling of a tape with large deformation and frictional sliding
DTSTART:20130712T140000
DTEND:20130712T150000
DTSTAMP:20260916T050603Z
UID:2bf7eb63ba74fc1382af45fbd8c0ce348f69f3103fbdca2fb1069a1d
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Matthew R. Begley\nBio : Matthew R. Begley is a Professo
 r of Materials and Mechanical Engineering at the University of California\
 , Santa Barbara. Prof. Begley joined UCSB in 2010\, following faculty posi
 tions at the University of Connecticut (1997-2001) and the University of V
 irginia (2001-2009).  He received his Ph.D. in mechanical engineering fro
 m UCSB in 1995\, where developed failure prediction codes for fibrous comp
 osites\, with an emphasis on high temperature applications.  From 1995-19
 97\, Prof. Begley was a post-doctoral fellow at Harvard University: during
  this time\, he worked on the thermomechanical performance of multilayered
  systems\, with an emphasis on material behavior at small scales and the r
 eliability of multifunctional coatings.  Professor Begley's current resea
 rch interests are focused on the mechanics of multilayers\, 3D printing of
  multi-phase materials\, and bio-insipred cellular materials.\nAbstract : 
 In some ‘weakly bonded’ systems\, notably those exploited by mussels a
 nd geckos\, it takes surprisingly large forces to drive separation. This i
 s true even for purely elastic materials where internal dissipation is neg
 ligible. A model of tape peeling is presented to quantify the impact of fr
 ictional sliding in the adhered region on the relationship between applied
  work and the energy required to break bonds at the interface. The energy 
 release rate for peeling in the presence of sliding is derived\, and is sh
 own (surprisingly) to be independent of the frictional law at the interfac
 e: nevertheless\, the required peel force with sliding asymptotes to infin
 ity when the tape is pulled tangential to the surface. This result is dram
 atically different than ‘classical’ energy release rate arguments for 
 peeling of purely sticking interfaces\, i.e. those pioneered by Kendall. 
  Recent experiments will be described for peeling of thin rubber films pre
 ssed into contact with glass slides: the results are in excellent agreemen
 t with the sliding model using a single adhesion energy that does not depe
 nd on peel angle. (Conversely\, one needs to invoke mixed-mode interface t
 oughness to fit Kendall’s peeling model.)  Digital image correlation me
 asurements of tape displacements corroborate the presence of sliding in th
 e adhered region ahead of the detachment point. The implications of the mo
 del and experiments for predicting detachment in natural and synthetic sys
 tems (such as roll-to-roll transfer of graphene) will be briefly summarize
 d.
LOCATION:ME B3 31 http://plan.epfl.ch/?room=MEB331
STATUS:CONFIRMED
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