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arXiv 1504.05068cond-mat.soft
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受约束弹性薄板的卡扣屈曲

Snap buckling of a confined thin elastic sheet

Gaetano Napoli, Stefano S. Turzi

摘要:

粘附到刚性基底上的生长或压缩的薄弹性片可以表现出屈曲不稳定性,形成向内的隆起。我们的研究表明,带材的形态取决于压缩能和弯曲能之间的微妙平衡。我们发现,这种不稳定性是一个一级相变之间的粘附解决方案和屈曲的解决方案,其主要控制参数有关的片材拉伸。在几乎不可拉伸的区域,我们给出了临界阈值的解析表达式.可压缩性是一个关键的假设,它使我们能够解决一个明显的矛盾的无界压力施加在外壁上的一个有限的灵活的循环。

英文摘要:

A growing or compressed thin elastic sheet adhered to a rigid substrate can exhibit a buckling instability, forming an inward hump. Our study shows that the strip morphology depends on the delicate balance between the compression energy and the bending energy. We find that this instability is a first order phase transition between the adhered solution and the buckled solution whose main control parameter is related to the sheet stretchability. In the nearly- unstretchable regime we provide an analytic expression for the critical threshold. Compressibility is the key assumption which allows us to resolve the apparent paradox of an unbounded pressure exerted on the external wall by a confined flexible loop.

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