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arXiv 2408.14239cond-mat.softphysics.app-ph
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非结构化弹性薄板中由局部张力诱导的巨型折叠

Localized tension-induced giant folding in unstructured elastic sheets

Kexin Guo, Marc Suñé, Kwok Ming Li, K. Jimmy Hsia, Mingchao Liu, Dominic Vella

AI总结:

研究发现各向同性非结构化弹性薄板在局部单轴张力下可产生巨型横向折叠,并通过标度律、实验与模拟揭示其张力转压缩的几何机制。

摘要:

受压屈曲是弹性失稳的典型范例:当沿最长维度受压时,扑克牌之类的薄结构会发生面外屈曲,从而在长度不发生显著变化的情况下适应所施加的压缩。然而,近期研究表明,对具有微观结构的薄板施加张力会导致面外变形,其应用涵盖从用于多稳态形变的“groovy metasheets(沟槽超构薄板)”到剪纸夹持器。在此,我们证明这种反直觉行为——由相对较小的施加纵向张力诱导的大幅横向折叠——也会出现在各向同性材料的非结构化薄板中。该行为的关键在于局部单轴张力会诱导巨型折叠;我们将其称为“localized TUG folding(局部TUG折叠)”,以体现局部张力的重要性及其驱动方式。我们表明,localized TUG folding之所以发生,是因为所施加的拉伸载荷被高效转化为压缩——这是局部施加张力产生的几何结果。我们确定了折叠角作为施加应变函数的标度结果,并与实验和模拟均相符。localized TUG folding的普适性质表明,它可能在比以往认识更广泛的材料和结构中得到利用。

英文摘要:

Buckling in compression is the archetype of elastic instability: when compressed along its longest dimension, a thin structure such as a playing card will buckle out-of-plane accommodating the imposed compression without a significant change of length. However, recent studies have demonstrated that tension applied to sheets with microscopic structure leads to out-of-plane deformation in applications from `groovy metasheets' for multi-stable morphing to kirigami grippers. Here, we demonstrate that this counter-intuitive behavior -- a large transverse folding induced by a relatively small imposed longitudinal tension -- occurs also in unstructured sheets of isotropic material. The key to this behavior is that a localized uniaxial tension induces giant folding; we refer to this as `localized TUG folding' to reflect the importance of localized tension and its mode of actuation. We show that localized TUG folding occurs because of an efficient transfer of applied tensile load into compression -- a geometric consequence of a localized applied tension. We determine scaling results for the folding angle as a function of applied strain in agreement with both experiments and simulations. The generic nature of localized TUG folding suggests that it might be utilized in a broader range of materials and structures than previously realized.

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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