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arXiv 2112.13699cond-mat.soft
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随机kirigami的几何力学

Geometric mechanics of random kirigami

Gaurav Chaudhary, Lauren Niu, Marta Lewicka, Qing Han, L Mahadevan

摘要:

在薄的平面片材中存在切口可以显著地改变其对载荷的机械和几何响应,因为切口允许片材在第三维中强烈变形。我们使用数值实验来表征kirigamized片材的几何力学作为一个功能的数量,大小和方向的削减。我们表明,机械加载片的几何形状可以近似为一个组成的简单的可开发的单位:单位,圆柱体,圆锥体和压缩Elasticae。这种几何结构产生简单的比例律的机械响应的片材在弱和强变形的限制。在最终拉伸极限中,这进一步导致了一个关于任意kirigami模式中测地线的性质和形式的定理,与观测和模拟一致。通过改变kirigamized表中的测地线的形状和大小,我们表明,我们可以控制的部署轨迹的表,因此其功能特性作为一个机器人抓手或柔光窗口。总的来说,我们的研究随机kirigami设置的阶段,控制形状和屏蔽应力薄板使用削减。

英文摘要:

The presence of cuts in a thin planar sheet can dramatically alter its mechanical and geometrical response to loading, as the cuts allow the sheet to deform strongly in the third dimension. We use numerical experiments to characterize the geometric mechanics of kirigamized sheets as a function of the number, size and orientation of cuts. We show that the geometry of mechanically loaded sheets can be approximated as a composition of simple developable units: flats, cylinders, cones and compressed Elasticae. This geometric construction yields simple scaling laws for the mechanical response of the sheet in both the weak and strongly deformed limit. In the ultimately stretched limit, this further leads to a theorem on the nature and form of geodesics in an arbitrary kirigami pattern, consistent with observations and simulations. By varying the shape and size of the geodesic in a kirigamized sheet, we show that we can control the deployment trajectory of the sheet, and thence its functional properties as a robotic gripper or a soft light window. Overall our study of random kirigami sets the stage for controlling the shape and shielding the stresses in thin sheets using cuts.

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