Elastic buckling shape control of thin-walled cylinder using pre-embedded curved-crease origami patterns
Elastic buckling shape control of thin-walled cylinder using pre-embedded curved-crease origami patterns
复制标题
使用预埋弯曲折痕折纸图案控制薄壁圆柱体的弹性屈曲形状
DOI：
10.1016/j.ijmecsci.2018.11.005
复制
发表时间：
2019-02-01
影响因子：
7.3
通讯作者：
Gattas, Joseph M.
中科院分区：
文献类型：
--
作者：
Lee, Ting-Uei;Yang, Xiaochen;Gattas, Joseph M.
几十年的研究使人们对薄壁管的屈曲行为有了全面的了解。许多这些研究试图控制屈曲行为的薄壁管，利用其缺陷敏感特性，引导变形过程中的一个可预测的屈曲模式。然而，这种技术的一个关键限制是无法预测后屈曲管的确切变形形状。本研究提出一种新的方法，以控制形状的弹性屈曲中长薄壁圆筒，使用预埋的曲线折痕折纸模式。破坏模式被预先确定为一个稳定的高阶弹性表面，这体现了通过钻石屈曲模式。一组原型进行了测试，并表明，屈曲过程可以引导到一系列的设计失效模式。变形的表面进行测量，并显示出具有接近精确的对应关系的分析描述，其中的平均绝对表面误差是小于0.3毫米的片材厚度的一半。然后，本研究密切探讨了屈曲过程的驱动机制，并表明，可控屈曲过程表现出从较高的应变能管状状态到较低的应变能弯曲折痕状态的快速过渡。
Decades of research has led to a comprehensive understanding of the buckling behaviour of thin-walled tubes. Many of these studies have attempted to control the buckling-behaviour of thin-walled tubes by utilising their imperfection sensitive characteristics to guide the deformation process to a predictable buckling mode. However, a key limitation of such techniques is an inability to predict the exact deformed shape of post-buckled tubes. This study presents a new method to control the shape of an elastically buckled medium length thin-walled cylinder by using pre-embedded curved-crease origami patterns. The failure mode is pre-determined as a stabilized high-order elastica surface, which manifests via a diamond buckling mode. A set of prototypes are tested and show that the buckling process can be guided to a range of designed failure modes. The deformed surface is measured and shown to have a near-exact correspondence to the analytical description, where the average absolute surface error is less than half of the 0.3mm sheet thickness. This study then closely explores the driving mechanics of the buckling process and shows that the controllable buckling process exhibits a bistable transition from a higher strain energy tubular state to a lower strain energy curved-crease state.