On axisymmetric/diamond-like mode transitions in axially compressed core-shell cylinders

- A theoretical analysis is carried out to find critical parameters for pattern selection in core-shell soft cylinders.
- A 3D finite element model is developed for post-buckling analysis from a quantitative standpoint.
- Tracing of surface mode transitions is performed by a path-following continuation technique.
- Transition from axisymmetric modes to non-axisymmetric diamond-like patterns is captured.
- Curvature and modulus effects on pattern selection are quantified and the phase diagram is drawn.