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arXiv 1503.01674cond-mat.softnlin.PSnlin.SI
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有限尺寸流体支承薄板中的褶皱和折叠

Wrinkles and folds in a fluid-supported sheet of finite size

Oz Oshri, Fabian Brau, Haim Diamant

摘要:

位于液体基底上的横向受限的薄弹性片显示出规则的起伏,称为褶皱,其特征在于空间延伸的能量分布和明确限定的波长$λ$。随着约束的增加,变形能逐渐局限于一个单一的狭窄的褶皱。一个精确的解决方案的变形的无限片材以前发现,在无限片材的皱纹是不稳定的,对本地化任意小的限制。我们提出了一个扩展的理论片有限长度的$L$,占实验观察到的折叠到折叠过渡。我们推导出一个精确的解的周期性变形的褶皱状态,和一个近似解的本地化,折叠状态。我们表明,这两个国家之间的二阶跃迁发生在一个关键的限制$Δ_F=λ^2/L$。

英文摘要:

A laterally confined thin elastic sheet lying on a liquid substrate displays regular undulations, called wrinkles, characterized by a spatially extended energy distribution and a well-defined wavelength $λ$. As the confinement increases, the deformation energy is progressively localized into a single narrow fold. An exact solution for the deformation of an infinite sheet was previously found, indicating that wrinkles in an infinite sheet are unstable against localization for arbitrarily small confinement. We present an extension of the theory to sheets of finite length $L$, accounting for the experimentally observed wrinkle-to-fold transition. We derive an exact solution for the periodic deformation in the wrinkled state, and an approximate solution for the localized, folded state. We show that a second-order transition between these two states occurs at a critical confinement $Δ_F=λ^2/L$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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