High-Speed Camera Probes The Peeling Behaviour Of Sticky Tape
09/06/2019![arquivo sem legenda ou nome](https://www.qd-latam.com/_libs/imgs/final/523.jpg)
Peeling tape away from a surface is a familiar, yet often frustrating experience; while it remains firmly stuck to the surface at some points, it can peel away too quickly at others.
The physics underlying this behaviour has been poorly understood until recently, but studies in 2010 uncovered a characteristic pattern in which peeling repeatedly stops and starts on scales of millimetres. Santucci and colleagues explored the scenario in further detail in 2015, revealing that this macroscopic stick–slip behaviour arises from energy being released close to the front separating the stuck and peeled tape.
![arquivo sem legenda ou nome](https://www.qd-latam.com/_libs/imgs/final/520.jpg)
Santucci and colleagues propose that the behaviour arises because both the tape’s adhesive, and the point at which it bends, build up elastic potential energy during sticking. Over the course of a slip, this potential is subsequently released at the tape’s separation front in the form of kinetic energy. From these insights, the researchers constructed a theoretical model incorporating the cube-root relationship underlying this energy budget.
Their simulations accurately predicted the peeling behaviours of tapes with a variety of properties.
![arquivo sem legenda ou nome](https://www.qd-latam.com/_libs/imgs/final/521.jpg)
Intriguingly, the team’s models were able to recreate the waves that propagate across the separation front, perpendicular to the tape, at speeds of up to 900 m/s during a slip.
The cause of this behaviour has yet to be explained, but the researchers compare it with the developments of cracks in solid materials – since in both scenarios new surfaces are created along propagating lines. In future work, Santucci’s team hope to use their simulations to learn more about this mysterious behaviour.
![arquivo sem legenda ou nome](https://www.qd-latam.com/_libs/imgs/final/522.jpg)
Source: https://bit.ly/2JJ5GMU, by Physics World
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