Effects of tension-compression asymmetry on the surface wrinkling of film-substrate systems

- Buckling and postbuckling of a stiff film on a compliant bimodular substrate.
- Both theoretical analysis and Fourier spectral numerical method are performed.
- Substrate nonlinearity greatly affects the selection of surface wrinkling modes.
- Non-equi-biaxial compression may engender a diversity of surface morphologies.
- Phase diagrams for the wrinkling patterns and their evolutions during postbuckling.