Micromechanical modeling of deployment and shape recovery of thin-walled viscoelastic composite space structures
The first part of the paper presents an experimental study of the deployment and shape recovery of composite tape-springs after stowage at an elevated temperature. It is found that tape-springs deploy quickly and with a slight overshoot, but complete recovery takes place asymptotically over time. Stowage has the effect of slowing down both the shortterm deployment and long-term shape recovery. The second part of the paper presents a micromechanical finite element homogenization scheme to determine the effective viscoelastic properties of woven composite laminas. This solution scheme is employed in numerical simulations of deployment and shape recovery of composite tape-springs. The proposed micromechanical model predicts both the short-term deployment and long-term shape recovery response with close agreement to the experimental measurements.
© 2012 by Kawai Kwok and Sergio Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. The authors are grateful to Professor Wolfgang Knauss at the California Institute of Technology for helpful comments and Gary Patz at Patz Materials Technologies for providing materials used for the present study. Financial support for Kawai Kwok by the Croucher Foundation is acknowledged.
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