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arXiv 1801.01166cond-mat.soft
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粘附力在起皱的Polymer薄膜力学中的作用

The Role of Adhesion in the Mechanics of Crumpled Polymer Films

Andrew B. Croll, Timothy Twohig, Theresa Elder

摘要:

薄膜的褶皱导致独特的刚性但重量轻的结构。这种硬度被归因于四个基本元素之间的复杂相互作用-平滑弯曲,尖锐褶皱,局部点(可展锥)和拉伸脊-但尚未获得结构的严格模型。在这封信中,我们表明,粘附力,表面之间的吸引力内的褶皱结构,是一个重要的,但被忽视的贡献的整体强度的褶皱膜。具体来说,我们进行实验,两种不同的聚合物薄膜和比较的作用,塑性形变,弹性形变和粘附在起皱。我们使用一个经验模型来捕捉定量的行为,并使用该模型表明,粘附导致一个数量级的“有效”模量增加。除了静力学,我们还进行力恢复实验。我们表明,一旦粘附占,塑料和弹性起皱的薄膜恢复mechanically。用我们的模型解释,通过起皱测量的时间常数显示出与在更传统的几何形状中测量的基础材料相同的分布。

英文摘要:

Crumpling of a thin film leads to a unique stiff yet lightweight structure. The stiffness has been attributed to a complex interplay between four basic elements - smooth bends, sharp folds, localized points (developable cones), and stretching ridges - yet rigorous models of the structure are not yet available. In this letter we show that adhesion, the attraction between surfaces within the crumpled structure, is an important yet overlooked contributer to the overall strength of a crumpled film. Specifically, we conduct experiments with two different polymers films and compare the role of plastic deformation, elastic deformation and adhesion in crumpling. We use an empirical model to capture the behaviour quantitatively, and use the model to show that adhesion leads to an order of magnitude increase in "effective" modulus. Going beyond statics, we additionally conduct force recovery experiments. We show that once adhesion is accounted for, plastic and elastic crumpled films recover logarithmically. The time constants measured through crumpling, interpreted with our model, show an identical distribution as do the base materials measured in more conventional geometries.

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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