arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.01095cond-mat.soft
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隐藏的对称性在周期性折纸中产生刚性折叠机制

Hidden symmetries generate rigid folding mechanisms in periodic origami

James McInerney, Bryan Gin-ge Chen, Louis Theran, Christian Santangelo, Zeb Rocklin

摘要:

我们考虑零能量变形的周期性折纸纸与通用折痕模式。使用映射从线性折叠运动的这种纸张的受力模式结合麦克斯韦-卡拉丁指数定理,我们推导出线性折叠运动的数量和刚体模式的数量之间的关系,只取决于折纸的顶点的平均协调数。这支持了最近的结果,塔奇显示周期性的折纸片与三角形面表现出二维空间的刚性折叠圆柱形配置。我们还发现,通过分析计算和数值模拟,分支的配置空间从平坦的状态,由于几何相容性约束,禁止有限的高斯曲率。相同的计数参数导致在三角形折纸中在相反波数处的空间变化模式的配对,防止拓扑极化,但允许可以用于重新配置折纸片的批量中的零能量变形族。

英文摘要:

We consider the zero-energy deformations of periodic origami sheets with generic crease patterns. Using a mapping from the linear folding motions of such sheets to force-bearing modes in conjunction with the Maxwell-Calladine index theorem we derive a relation between the number of linear folding motions and the number of rigid body modes that depends only on the average coordination number of the origami's vertices. This supports the recent result by Tachi which shows periodic origami sheets with triangular faces exhibit two-dimensional spaces of rigidly foldable cylindrical configurations. We also find, through analytical calculation and numerical simulation, branching of this configuration space from the flat state due to geometric compatibility constraints that prohibit finite Gaussian curvature. The same counting argument leads to pairing of spatially varying modes at opposite wavenumber in triangulated origami, preventing topological polarization but permitting a family of zero energy deformations in the bulk that may be used to reconfigure the origami sheet.

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