Shape memory alloys are an exciting new class of functional materials which’s unique properties are being utilised in more and more applications. SINTEF has in the past gained experience with the production of NiTi alloys through ingot casting, welding and brazing of NiTi alloys, and characterisation through DSC and advanced microscopy methods.

Currently, SINTEF is a partner in an EU sixth framework project called “WIND-CHIME” which stands for “Wide-range Non-intrusive Devices towards Conservation of Historical Monuments in the Mediterranean Area”. Within this project, the superelastic effect of shape memory alloys is being utilized to protect monumental buildings against damage caused by earthquakes. SINTEF is responsible for the selection and characterisation of the right shape memory alloys for application in seismic protection.

The illustration shows a strengthening method considered for monolithic blocks: During 18th century restorations of the Parthenon in Athens, cast iron I-profiles were used for strengthening. These can be replaced by shape memory alloys which are superelastic and dissipate large amount of energy during elastic deformation. The new shape memory profiles can be slid into the existing cavities. Moreover, the resistance of NiTi shape memory alloys against corrosion is excellent.

Photo: Casper van der Eijk	Illustration: Tor Åsmund Evjen

Recent publications:
Conference paper Third European Conference on Structural Control: 3ECSC 2004
Conference paper ASM Materials Solutions 2003

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