Jin, LihuaChen, DayongHayward, Ryan C.Suo, Zhigang2016-03-092014Jin, Lihua, Dayong Chen, Ryan C. Hayward, and Zhigang Suo. 2014. “Creases on the Interface Between Two Soft Materials.” Soft Matter 10 (2): 303–311. doi:10.1039/c3sm51512e.1744-683Xhttp://nrs.harvard.edu/urn-3:HUL.InstRepos:25757883Theory 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.en-USJournal Article2016-03-0910.1039/C3SM51512E