Yu Senjiang, Zhang Xiaofei, Xiao Xiaofei, Zhou Hong, Chen Miaogen
Department of Physics, China Jiliang University, Hangzhou 310018, P. R. China.
Soft Matter. 2015 Mar 21;11(11):2203-12. doi: 10.1039/c5sm00105f.
Homogeneous global wrinkling patterns such as labyrinths, herringbones, ripples and straight stripes can be widely observed in natural and artificial systems, but localized wrinkling patterns (not including buckle-driven delaminations, folds, ridges and creases) are seldom observed in experiments. Here we report on the spontaneous formation of highly ordered wrinkled stripes localized by cracks in metal films deposited on soft substrates. The experiment shows that the metal film is under a large tensile stress during deposition, which is relieved by the formation of networked cracks. After deposition, a compressive stress is stored up in the film and it always focuses near the new formed cracks due to the plastic deformation of the film, resulting in the formation of localized wrinkled stripes composed of a large number of straight wrinkles perpendicular to the cracks. The morphological characteristic, formation mechanism and evolution behaviors of the localized wrinkled stripes have been described and discussed in detail.
诸如迷宫纹、人字形纹、波纹和直线条纹等均匀的全局皱纹图案在自然和人工系统中广泛可见，但局部皱纹图案（不包括屈曲驱动的分层、褶皱、脊和折痕）在实验中很少被观察到。在此，我们报道了在沉积于软基底上的金属薄膜中，由裂纹局部化形成的高度有序皱纹条纹的自发形成。实验表明，金属薄膜在沉积过程中承受着较大的拉应力，该应力通过形成网络状裂纹得以释放。沉积后，薄膜中储存了压缩应力，并且由于薄膜的塑性变形，该应力总是集中在新形成的裂纹附近，从而导致形成由大量垂直于裂纹的直线皱纹组成的局部皱纹条纹。本文详细描述并讨论了局部皱纹条纹的形态特征、形成机制和演化行为。
