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IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century


IASS Symposium 2016

SESSION: Structural Morphology

Flexural mechanics of creases in thin metallic strips

< Table of Contents for Structural Morphology
  • Proceedings Name: IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century
  • ISSN: (Electronic Version) 2518-6582
  • Session: Structural Morphology
  • Pages: 9
  • Title: Flexural mechanics of creases in thin metallic strips
  • Author(s): Martin G. Walker, Keith A. Seffen
  • Keywords: creasing, shells, folding
Abstract
The presence of mechanically formed corrugations in thin metallic shells has been shown to have a dramatic effect on mechanical behaviour. Currently, the majority of research has concentrated on the opening characteristics of a folded crease as part of an origami structure; surprisingly little study has been done on the flexural mechanics of a crease bent along its axis. We address this behaviour here. For analysis purposes, it is common to treat the crease line as a singular elastic rotational hinge. We examine this assumption for creases in thin metallic strips by endowing the crease with a finite, but small, geometry and approaching the singular limit. We show that when the crease dimensions are on the order of the shell thickness, the crease does not open appreciably and therefore stretching along the crease line must occur. A simple mathematical model is developed which matches practical flexural behaviour well.

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