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Development and Characterization of High Performance Shape Memory Alloy Coatings for Structural Aerospace
Dimitrios A Exarchos1, Panagiota T Dalla2, Ilias K Tragazikis3
1Department of Materials Science and Engineering, University of Ioannina, 45110 Ioannina, Greece. dexarch@cc.uoi.gr.
Abstract:
This paper presents an innovative approach, which enables control of the mechanical properties of metallic components by external stimuli to improve the mechanical behavior of aluminum structures in aeronautical applications. The approach is based on the exploitation of the shape memory effect of novel Shape Memory Alloy (SMA) coatings deposited on metallic structural components, for the purpose of relaxing the stress of underlying structures by simple heating at field-feasible temperatures, therefore enhancing their structural integrity and increasing their stiffness and rigidity while allowing them to withstand expected loading conditions safely. Numerical analysis provided an insight in the expected response of the SMA coating and of the SMA-coated element, while the dependence of alloy composition and heat treatment on the experienced shape memory effect were investigated experimentally. A two-phase process is proposed for deposition of the SMA coating in an order that induces beneficial stress relaxation to the underlying structure through the shape memory effect.
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