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Nonlinear deformation of thin-walled structures for deployable and morphing applications

用于可展开和变形应用的薄壁结构的非线性变形

基本信息

批准号：
1782487
负责人：
金额：
--
依托单位：
University of Cambridge
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2016
资助国家：
英国
起止时间：
2016 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-1782487
关键词：
Nonlinear deformation thin walled structures

项目摘要

This PhD project concerns the nonlinear deformation of thin-walled structures for deployable and morphing applications. Previous research has identified two notable elements; so-called "tape-springs" and corrugated sheets. Both are familiar in everyday life, as tape-measures and as roofing elements, respectively. If they are made to be sufficiently thin, they can buckle elastically and deform in a localised manner; and if pre-stressed (by means of plastic working), they can be bistable, tristable or even neutrally stable in their deformed states. This project aims to explore generalised versions of tape-springs and corrugated sheets. The first aspect proposes to make a "tape-ring" - instead of being straight, the tape curves around to form a ring, resulting in an open toroidal shape. Preliminary finite element analysis by Seffen has established that a tape-ring buckles in the same way as a tape-spring but forms two creases, which can then travel around the ring, enabling a type of zero-stiffness spinning action. The project will then consider how to interconnect tape-rings as repeating planar units, in order to form a plate with local texture and holes. It is surmised that the interacting units will proffer unusual and novel, large deformations of the plate overall. The project will combine experiments, manufacturing, computational study and mathematical analysis. This project falls within the Structural Engineering research area.

该PHD项目涉及可展开和变形应用的薄壁结构的非线性变形。以前的研究已经确定了两个值得注意的元素：所谓的“带状弹簧”和波纹板。两者在日常生活中都很常见，分别作为卷尺和屋顶元件。如果它们足够薄，它们可以弹性屈曲并以局部方式变形；如果施加预应力(通过塑性加工)，它们在变形状态下可以双稳、三稳甚至中性稳定。该项目旨在探索带弹簧和波纹板的通用版本。第一个方面建议制造一个“胶带环”--胶带不是直的，而是弯曲成一个环，形成一个开放的环形形状。Seffen的初步有限元分析已经确定，带环以与带弹簧相同的方式弯曲，但会形成两个折痕，然后折痕可以绕着环运动，从而实现一种零刚度旋转动作。然后，该项目将考虑如何将胶带环作为重复的平面单元互连，以便形成具有局部纹理和孔洞的板。据推测，相互作用的单元将提供板块整体不寻常的、新颖的、大的变形。该项目将结合实验、制造、计算研究和数学分析。该项目属于结构工程研究领域。