CUED Publications database

The plastic collapse and energy absorption capacity of egg-box panels

Zupan, M and Chen, C and Fleck, NA (2003) The plastic collapse and energy absorption capacity of egg-box panels. International Journal of Mechanical Sciences, 45. pp. 851-871. ISSN 0020-7403

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Abstract

The plastic collapse response of aluminium egg-box panels subjected to out-of-plane compression has been measured and modelled. It is observed that the collapse strength and energy absorption are sensitive to the level of in-plane constraint, with collapse dictated either by plastic buckling or by a travelling plastic knuckle mechanism. Drop weight tests have been performed at speeds of up to 6 m s-1, and an elevation in strength with impact velocity is noted. A 3D finite element shell model is needed in order to reproduce the observed behaviours. Additional calculations using an axisymmetric finite element model give the correct collapse modes but are less accurate than the more sophisticated 3D model. The finite element simulations suggest that the observed velocity dependence of strength is primarily due to strain-rate sensitivity of the aluminium sheet, with material inertia playing a negligible role. Finally, it is shown that the energy absorption capacity of the egg-box material is comparable to that of metallic foams. © 2003 Elsevier Ltd. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Egg-box material Energy absorption Plastic buckling Plastic collapse Travelling knuckle
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:24
Last Modified: 08 Dec 2014 02:13
DOI: 10.1016/S0020-7403(03)00136-X