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research-article

A Model of Packaging Folds in Metal - Polymer Laminates

[+] Author and Article Information
Gabriel Secheli

PhD candidate
gabi_secheli@yahoo.co.uk

Andrew D. Viquerat

Lecturer, Department of Mechanical Engineering Sciences, University of Surrey, UK
a.viquerat@surrey.ac.uk

Guglielmo Aglietti

Surrey Space Centre Director
g.aglietti@surrey.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4037503 History: Received June 16, 2017; Revised July 31, 2017

Abstract

Thin metal-polymer laminates make excellent materials for use in inflatable space structures. By inflating a stowed envelope using pressurised gas, and by increasing the internal pressure slightly beyond the yield point of the metal films, the shell rigidizes in the deployed shape. Structures constructed with such materials retain the deployed geometry once the inflation gas has either leaked away, or it has been intentionally vented. For flight, these structures must be initially folded and stowed. This paper presents a numerical method for predicting the force required to achieve a given fold radius in a three - ply metal-polymer-metal laminate and to obtain the resultant springback. A coupon of the laminate is modelled as a cantilever that under the action of an increasing tip force. Fully elastic, elastic-plastic, relaxation and springback stages are included in the model. The results show good agreement when compared with experimental data at large curvatures.

Copyright (c) 2017 by ASME
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