Peeling of a tape with large deformation and frictional sliding
Event details
| Date | 12.07.2013 |
| Hour | 14:00 › 15:00 |
| Speaker |
Prof. Matthew R. Begley Bio : Matthew R. Begley is a Professor of Materials and Mechanical Engineering at the University of California, Santa Barbara. Prof. Begley joined UCSB in 2010, following faculty positions at the University of Connecticut (1997-2001) and the University of Virginia (2001-2009). He received his Ph.D. in mechanical engineering from UCSB in 1995, where developed failure prediction codes for fibrous composites, with an emphasis on high temperature applications. From 1995-1997, 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 reliability of multifunctional coatings. Professor Begley's current research interests are focused on the mechanics of multilayers, 3D printing of multi-phase materials, and bio-insipred cellular materials. |
| Location | |
| Category | Conferences - Seminars |
Abstract : In some ‘weakly bonded’ systems, notably those exploited by mussels and geckos, it takes surprisingly large forces to drive separation. This is true even for purely elastic materials where internal dissipation is negligible. A model of tape peeling is presented to quantify the impact of frictional 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 shown (surprisingly) to be independent of the frictional law at the interface: nevertheless, the required peel force with sliding asymptotes to infinity when the tape is pulled tangential to the surface. This result is dramatically 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 pressed into contact with glass slides: the results are in excellent agreement with the sliding model using a single adhesion energy that does not depend on peel angle. (Conversely, one needs to invoke mixed-mode interface toughness to fit Kendall’s peeling model.) Digital image correlation measurements of tape displacements corroborate the presence of sliding in the adhered region ahead of the detachment point. The implications of the model and experiments for predicting detachment in natural and synthetic systems (such as roll-to-roll transfer of graphene) will be briefly summarized.
Practical information
- General public
- Free
Organizer
- IGM-GE
Contact
- Géraldine Palaj