|COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring.|
Peeling adhesive tape: A case study for understanding the effective properties of heterogenous materials
If you have a question about this talk, please contact Ms Helen Gardner.
While there is a good understanding of the overall behavior of heterogeneous materials concerning properties that are characterized by a variational principle, much remains unknown concerning those properties that are characterized by evolutionary processes. This talk will discuss the simple process of peeling an adhesive tape from a rigid substrate as a case study to demonstrate the complexities that can arise in this situation. Specifically, we show that that one can dramatically enhance the overall adhesive strength by patterning the elastic modulus of the tape, and induce asymmetry where the force needed to peel the membrane depends not only on the direction but also the sense of the peel. Remarkably, these modifications in peeling strength come from variations in the energy associated with bending of the tape near the peeling front which is negligible compared to the overall energy in the system. This illustrates that in evolutionary processes, perturbations with apparently negligible energy can have an anomalously large macroscopic effect. The talk will conclude with broader lessons for other phenomena including fracture, dislocations, phase boundaries and wetting fronts.
This is based on joint work with S. Xia, L. Ponson and G. Ravichandran
This talk is part of the Engineering Department Micromechanics Seminars series.
This talk is included in these lists:
Note that ex-directory lists are not shown.
Other listsepigenetic club Museum of Zoology Construction Engineering Seminars
Other talksIPBES between Theory and Practice: How weighted concepts travel Quantum Simulators with Polariton Graphs The Impact of Infection on Human Genetic and Cultural Evolution Velocity Variations from Ambient Noise Interferometry at Kilauea Volcano, Hawaii Curl forces and beyond Architecture for Resilience - surviving earthquakes, tornadoes, fire and floods.