DMTA study of a nickel-titanium wire |
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Authors: | Artiaga R Garcia A Garcia L Varela A Mier J L Naya S Grana M |
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Institution: | 1.Department of Industrial Engineering II, E.P.S., University of A Coru?a, Ferrol, Spain ;2.Department of Mathematics, Faculty of Computer Sciences, University of A Coru?a, 15004 A, Coru?a, Spain ;3.Department of Industrial Engineering, E.U.P., University of A Coru?a, Ferrol, Spain ; |
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Abstract: | The nickel-titanium alloys are usually known as Shape Memory alloys because of their ability to return to some previously
defined shape or size when subjected to the appropriate thermal procedure. Mechanical properties of a nickel titanium wire
were investigated by DMTA using cylindrical tension mode. The Young"s modulus, the maximum strain and residual deformation
have been calculated. Recovery of previously deformed samples was observed in constant stress temperature ramp tests. Relaxation
stress behaviour at temperatures above the austenitic transformation has been studied. The strain and frequency ranges of
linear response have been determined by dynamic experiments. Strain amplitude of 0.1% and frequency of 1 Hz have been chosen
for the temperature ramp dynamic experiments. A big change between 65 and 95°C is observed in the storage modulus. The values
of E' at temperatures below and above the transition are essentially constant. Finally, the effects of the frequency at different
temperatures have been examined.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | DMTA elastic moduli nickel-titanium alloys |
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