Brown University School of Engineering

Joint Materials/Solid Mechanics Seminar Series “Wrinkling Modes and Instabilities in Elastomers and Film/Elastomer Bilayers”

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Monday, February 11, 2013 4:00pm - 5:00pm

Joint Materials/Solid Mechanics Seminar Series “Wrinkling Modes and Instabilities in Elastomers and Film/Elastomer Bilayers” John W. Hutchinson School of Engineering and Applied Sciences Harvard University Abstract: Recent research activities in soft materials have generated a rich array of new experimental and theoretical observations on wrinkling modes of compressed single-layer elastomers and bilayers comprised of a stiff thin film on a thick compliant elastomer substrate. The seminar will begin with examples drawn from experimental work by a number of investigators. Then, an overview will be presented of recent theoretical work describing different kinds of wrinkling modes and their stability with emphasis on both initial wrinkling modes and secondary modes that arise as the compression is increased beyond the onset of wrinkling. Advanced localized modes such as folds, creases and ridges will be described. Contrasts between single-layer and bilayer behaviors will be drawn. In particular, the exceptional stability of the sinusoidal wrinkling mode of a stiff thin film on a compliant substrate is contrasted with the highly unstable and imperfection-sensitive behavior of wrinkling of a compressed half-space of elastomer. Wrinkling of a compressed elastomer half- space is highly unstable due to nonlinear interaction among the multiple modes leading to collapse into a finite amplitude crease. Monday, February 11, 2013 4:00-5:00 p.m. B&H Room 190