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Proceedings Paper

In-situ measurement of viscoelastic effects in composite tape springs
Author(s): Alessa J. Makuch; Whitney D. Reynolds
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Paper Abstract

Bi-stable composite tape springs present several volume efficient solutions for deployable structures in small satellites. Viscoelastic changes within the composite matrix of these materials caused by their long term storage and exposure to varying temperatures can negatively impact the ability to deploy the structure. This study investigates a method for developing an in situ sensor for structural health monitoring in space structures employing tape springs. A method is developed by employing a custom load cell to detect stress relaxation in a bent tape spring over a period of time and two tests of this method were conducted. Results from the first test reveal the correct trend for stress relaxation but with significant noise. The second test showed the cause of the noise to be material behavior changes due to temperature fluctuations. The results show the expected decreasing exponential trend in the strain data as stress relaxation occurs, proving the feasibility of the approach.

Paper Details

Date Published: 20 April 2012
PDF: 8 pages
Proc. SPIE 8348, Health Monitoring of Structural and Biological Systems 2012, 83481H (20 April 2012); doi: 10.1117/12.915359
Show Author Affiliations
Alessa J. Makuch, Penn State Univ. (United States)
Air Force Research Lab. (United States)
Whitney D. Reynolds, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 8348:
Health Monitoring of Structural and Biological Systems 2012
Tribikram Kundu, Editor(s)

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