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A novel bilayer is introduced, consisting of a stiff film adhered to a softsubstrate with patterned holes beneath the film and substrate interface. Touncover the transition of surface patterns, two dimensional plane strainsimulations are performed on the defected bilayer subjected to uniaxialcompression. Although the substrate is considered as the linear elasticmaterial, the presence of defects can directly trigger the formation of locallyridged and then folding configurations from flat surface with a relativelysmall compressive strain. It is followed by the coexisting phases of folds andwrinkles under further overall compression. This phase transition reverses thetraditional transition of wrinkle to ridge or fold for defect free substrates.It is also found that the onset of initial bifurcation is highly dependent onthe spatial configuration and geometries of holes, since the interaction ofdefects allows more strain relief mechanisms beyond wrinkling. Furthermore, arich diversity of periodic surface topologies, including overall waves,localizations, saw like and coexisting features of folds and wrinkles can beobtained by varying the diameter, depth and spacing of holes as well ascompressive strain, which provides a potential approach to engineer varioussurface patterns for applications.

Unconventional Localization Prior to Wrinkles and Controllable Surface Patterns of Film Substrate Bilayers Through Patterned Defects in Substrate