Shmuel Rubinstein, Department of Applied Physics, Harvard University, Cambridge, MA, will present seminar. Professor Itai Cohen, host, TBA.
Seminar Title: The crumpled state: crumpling dynamics and the evolution of damage networks
Abstract: The simple process of crumpling a sheet of paper with our hands results in a complex network of interconnected permanent creases of many sizes and orientations. Sheet preferentially bends along these creases, introducing history dependence to the process of crumpling. I will present an experimental study of the dynamics of crumpling. Specifically, I will first discuss how a crease network evolves when a thin elastoplastic sheet is repeatedly crumpled, opened up and then re-crumpled. Is there a maximally crumpled state after which the flat sheet can be deformed without further plastic damage? If time permits, I will also I'll describe our investigation of the properties of highly crumpled thin sheets, which exhibit unusual mechanical properties. Including slow relaxations, memory effects and intermittent response to a continuous drive.
Douglas E. Milton, Sr.
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