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Curved Crease Tube Structures as an Energy Absorbing Crash Box

[+] Author Affiliations
Daniel Garrett, Zhong You

University of Oxford, Oxford, UK

Joseph M. Gattas

University of Queensland, Brisbane, Australia

Paper No. DETC2016-59784, pp. V05BT07A017; 9 pages
doi:10.1115/DETC2016-59784
From:
  • ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 5B: 40th Mechanisms and Robotics Conference
  • Charlotte, North Carolina, USA, August 21–24, 2016
  • Conference Sponsors: Design Engineering Division, Computers and Information in Engineering Division
  • ISBN: 978-0-7918-5016-9
  • Copyright © 2016 by ASME

abstract

Straight-crease origami crash boxes have previously been designed to possess a near optimum failure mode for a tubular energy-absorbing device. This failure mode, termed a ‘complete diamond mode’ (CDM), possesses a low peak force Pmax and high average force Pavg, caused by generation of travelling hinge lines that propagate laterally during crushing. The present study investigates the hypothesis that a curved crease structure could further improve failure characteristics by having a lower Pmax due to the initially curved corner lobes. An experimental and numerical investigation was conducted using aluminium curved crease origami tubes, with certain curved crease tubes exhibiting the desired CDM and good correspondence seen between experimental and numerical behaviours. A parametric numerical analysis on 45 steel curved crease origami tubes showed a maximum reduction in Pmax of 67% was observed, which is better than the straight-crease origami crash boxes in this respect. A maximum increase in Pavg of 65% was observed, which is worse than straight-crease origami crash boxes. A lower Pmax was thus achieved as hypothesised, however this improvement came at the expense of a reduction in average force. Curved crease crash boxes are therefore concluded to have minimal benefit over existing straight crease crash box designs.

Copyright © 2016 by ASME

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