Title page for ETD etd-10012008-063036


Type of Document Master's Thesis
Author Lenahan, Kristie M.
URN etd-10012008-063036
Title Thermoelastic control of adaptive composites for aerospace applications using embedded nitinol actuators
Degree Master of Science
Department Electrical Engineering
Advisory Committee
Advisor Name Title
No Advisors Found
Keywords
  • aerospace structures
  • shape memory alloy elements
Date of Defense 1996-05-05
Availability restricted
Abstract

Aerospace structures have stringent pointing and shape control requirements during long-term exposure to a hostile environment with no scheduled maintenance. This makes them excellent candidates for a smart structures approach as current passive techniques prove insufficient. This study investigates the feasibility of providing autonomous dimensional control to aerospace structures by embedding shape memory alloy elements inside composite structures. Increasing volume fractions of nitinol wire were embedded in cross-ply graphite/ epoxy composite panels. The potential of this approach was evaluated by measuring the change in longitudinal strain with increasing temperature and volume fraction. Reduction of thermal expansion is demonstrated and related to embedded volume fraction.

Classical lamination theory is used to formulate a two-dimensional model which included the adaptive properties of the embedded nitinol. The model was used to predict the increased modulus and reduction of thermal strain in the modified plates which was verified by the experimental data.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
[VT] LD5655.V855_1996.L463.pdf 1.69 Mb 00:07:48 00:04:00 00:03:30 00:01:45 00:00:08
[BTD] next to an author's name indicates that all files or directories associated with their ETD are accessible from the Virginia Tech campus network only.

Browse All Available ETDs by ( Author | Department )

dla home
etds imagebase journals news ereserve special collections
virgnia tech home contact dla university libraries

If you have questions or technical problems, please Contact DLA.