School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287.
Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Department of Engineering Mechanics, Zhejiang University, Hangzhou, Zhejiang 310027, China.
Proc Natl Acad Sci U S A. 2018 Feb 27;115(9):2032-2037. doi: 10.1073/pnas.1720171115. Epub 2018 Feb 12.
Origami has been employed to build deployable mechanical metamaterials through folding and unfolding along the crease lines. Deployable metamaterials are usually flexible, particularly along their deploying and collapsing directions, which unfortunately in many cases leads to an unstable deployed state, i.e., small perturbations may collapse the structure along the same deployment path. Here we create an origami-inspired mechanical metamaterial with on-demand deployability and selective collapsibility through energy analysis. This metamaterial has autonomous deployability from the collapsed state and can be selectively collapsed along two different paths, embodying low stiffness for one path and substantially high stiffness for another path. The created mechanical metamaterial yields load-bearing capability in the deployed direction while possessing great deployability and collapsibility. The principle in this work can be utilized to design and create versatile origami-inspired mechanical metamaterials that can find many applications.
折纸被用于通过沿着折痕折叠和展开来构建可展开的机械超材料。可展开的超材料通常是柔性的，特别是沿着它们的展开和折叠方向，但不幸的是，在许多情况下，这会导致不稳定的展开状态，即小的扰动可能会沿着相同的展开路径使结构坍塌。在这里，我们通过能量分析创建了一个具有按需可展开性和选择性可折叠性的折纸启发式机械超材料。这种超材料具有从折叠状态自动展开的能力，并且可以沿着两条不同的路径选择性地折叠，为一条路径提供低刚度，为另一条路径提供高得多的刚度。所创建的机械超材料在展开方向上具有承载能力，同时具有很好的可展开性和可折叠性。这项工作中的原理可以用于设计和创建多功能的折纸启发式机械超材料，这些材料可以有很多应用。
