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Abstract

(Meta-)Materials, e.g. functional or architectured materials that change shape in response to external stimuli, often do so by exploiting solid–solid phase transitions or concerted elastic deformations. For the resulting system to be effective the (meta-)material needs to have desirable and tunable properties at length scales sufficiently small that desirable continuum behaviour of the resulting component is obtained. Developing such (meta-)materials has proven to be an endeavour which requires considerable expertise in science, engineering and mathematics. Here, we pursue an alternative approach where the design for functionality is integrated across multiple length scales in the system. We demonstrate this approach by designing and prototyping helical lattices that act as one-dimensional thermoelastic materials with unusual properties such as negative thermal expansivity—with magnitude far exceeding the most extreme values reported in the literature—and zero-hysteresis shape memory. Our strategy is independent of characteristic length scale, allowing us to design behaviour across a range of dimensions.

Original languageEnglish
Article number103704
Number of pages14
JournalJournal of the Mechanics and Physics of Solids
Volume133
Early online date30 Aug 2019
DOIs
Publication statusPublished - 1 Dec 2019

Structured keywords

  • Bristol Composites Institute ACCIS

Keywords

  • Architected-Materials
  • Meta-Materials
  • Anisotropy
  • Composites
  • Thermoelastic Materials
  • Nonlinear Elasticity

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