Bending and wrinkling as competing relaxation pathways for strained   free-hanging films
  An equilibrium phase diagram for the shape of compressively strained free-hanging films is developed by total strain energy minimization. For small strain gradients {\Delta}{\epsilon}, the film wrinkles, while for sufficiently large {\Delta}{\epsilon}, a phase transition from wrinkling to bending occurs. We consider competing relaxation mechanisms for free-hanging films, which have rolled up into tube structures, and we provide an upper limit for the maximum achievable number of tube rotations. 
P. Cendula, S. Kiravittaya, Y. Mei, Ch. Deneke and O. G. Schmidt
cond-mat.mes-hall cond-mat.mtrl-sci