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Proceedings Paper

Shape memory alloy wires turn composites into smart structures part I: material requirements
Author(s): Jan Schrooten; Veronique J. Michaud; Yanjun Zheng; J. Antonio Balta-Neumann; Jan-Anders E. Manson
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Paper Abstract

Composites containing thin Shape Memory Alloy (SMA) wires show great potential as materials able to adapt their shape, thermal behavior or vibrational properties to external stimuli. The functional properties of SMA-composites are directly related to the constraining effect of the matrix on the reversible martensitic transformation of the embedded pre-strained SMA wires. The present work reports results of a concerted European effort towards a fundamental understanding of the manufacturing and design of SMA composites. This first part investigates the transformational behavior of constrained SMA wires and its translation into functional properties of SMA composites. Thermodynamic and thermomechanical experiments were performed on SMA wires. A model was developed to simulate the thermomechanical behavior of the wires. From the screening of potential wires it was concluded that NiTiCu, as well as R-phase NiTi appeared as best candidates. Requirements for the host composite materials were surveyed. A Kevlar-epoxy system was chosen. Finally, the quality of the SMA wire-resin interface was assessed by two different techniques. These indicated that a thin oxide layer seems to provide the best interfacial strength. A temperature window in which SMA composites can be safely used was also defined. The manufacturing and properties of the SMA composites will be discussed in Part II.

Paper Details

Date Published: 9 July 2002
PDF: 11 pages
Proc. SPIE 4698, Smart Structures and Materials 2002: Industrial and Commercial Applications of Smart Structures Technologies, (9 July 2002); doi: 10.1117/12.475099
Show Author Affiliations
Jan Schrooten, Katholieke Univ. Leuven (Belgium)
Veronique J. Michaud, Ecole Polytechnique Federale de Lausanne (Switzerland)
Yanjun Zheng, Katholieke Univ. Leuven (Belgium)
J. Antonio Balta-Neumann, Ecole Polytechnique Federale de Lausanne (Switzerland)
Jan-Anders E. Manson, Ecole Polytechnique Federale de Lausanne (Switzerland)

Published in SPIE Proceedings Vol. 4698:
Smart Structures and Materials 2002: Industrial and Commercial Applications of Smart Structures Technologies
Anna-Maria Rivas McGowan, Editor(s)

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