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Proceedings Paper

Optimal design of a shape memory alloy actuated composite structure with iterative finite element analysis
Author(s): Richard D. Widdle Jr.; Matthew T. Grimshaw; Moushumi Shome
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Paper Abstract

A method is described for solving an inverse design problem to find the unassembled, stress-free component shapes of a structure thatis integrally actuated with shape memory alloy (SMA) actuators. Morphing and multifunctional structures are of interest in the aerospace industry becasue of the potential for improving structural and aerodynamic performance across multiple operating conditions. The focus of this work is on structures that are morphed with SMA flexural actuators. For the case where the geometry is known for unassembled components, assembly can be simulated to find the assembled shapes of the morphing structure. In the usual design case, however, only the desired shapes as assembled are known in multiple actuation states, and the corresponding unassembled shapes must be determined by an iterative solution process. An iterative finite element analysis approach to this problem is reported here. First an initial guess for the unassembled shapes is made and assembly is simulated with the finite element method. The resulting shapes are found for both SMA phases and compared with the desired shapes. A gradient-based optimization method is employed to update the initial geometry and iteration continues until the desired shapes are achieved. A simplified method of modeling the SMA material behavior is used for computational efficiently. It is found that this approach provides a practical way to solve the inverse design problem for structures that are integrally actuated with SMA material.

Paper Details

Date Published: 6 April 2009
PDF: 11 pages
Proc. SPIE 7288, Active and Passive Smart Structures and Integrated Systems 2009, 728818 (6 April 2009); doi: 10.1117/12.815657
Show Author Affiliations
Richard D. Widdle Jr., Boeing Research and Technology (United States)
Matthew T. Grimshaw, Boeing Research and Technology (United States)
Moushumi Shome, Boeing Research and Technology (United States)

Published in SPIE Proceedings Vol. 7288:
Active and Passive Smart Structures and Integrated Systems 2009
Mehdi Ahmadian; Mehrdad N. Ghasemi-Nejhad, Editor(s)

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