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From:
Jin, L., Chen, D., Hayward, R. C., and Suo, Z., 2014, “Creases on the Interface Between Two Soft Materials,” Soft Matter, 10(2), pp. 303–311., 2014, DOI: 10.1039/c3sm51512e
ABSTRACT: Theory and experiment are presented to show that an interface between two soft materials under compression can form creases, a type of bifurcation distinct from wrinkles. While creases bifurcate from a state of flat interface by a deformation localized in space and large in amplitude, wrinkles bifurcate from a state of flat interface by a deformation nonlocal in space and infinitesimal in amplitude. The interfacial creases set in at a lower critical compression than interfacial wrinkles, but higher than surface creases. The condition for the onset of interfacial creases is scale-free, and is calculated in terms of elastic moduli, pre-strains and applied strains.
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