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Viscoelastic Effects in Metal-Polymer Laminate Inflatable Structures

Viquerat, AD and Schenk, M (2016) Viscoelastic Effects in Metal-Polymer Laminate Inflatable Structures In: 3rd AIAA Spacecraft Structures Conference, 2016-01-04 - 2016-01-08, San Diego, CA.

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A 1 m long inflatable-rigidizable mast was developed as a payload for InflateSail: a 3U CubeSat technology demonstration mission. The thin-walled cylindrical mast consists of an aluminum-polymer laminate, and long-term structural performance is ensured through strain-rigidization: the packaging creases are removed through plastic deformation of the aluminum plies. During ground tests it was observed that after rigidization the internal pressure dropped more rapidly than could be accounted for by leakage of inflation gas alone. It was hypothesized that viscoelastic behaviour of the laminate material causes a further, time-dependent (order of seconds), increase in cylinder diameter, with a corresponding drop in internal pressure. Additional experiments revealed an increase in diameter, including large visco-elastic shear in the adhesive of the lap joint. This was not found to be sufficient to fully account for the observed reduction in pressure. An increase in temperature of the gas during inflation, with subsequent cooling down to ambient is thought to cause the additional pressure drop.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Surrey research (other units)
Authors :
Schenk, M
Date : 6 January 2016
DOI : 10.2514/6.2016-1221
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:48
Last Modified : 23 Jan 2020 18:51

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