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Frequency Effects on the Damping Capacity of Superelastic Nitinol

Published online by Cambridge University Press:  10 February 2011

H. N. Jones
H. N. Jones*
Affiliation:
Physical Metallurgy Branch, Materials Science and Technology Division, Naval Research Laboratory, Washington DC 20375
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Abstract

The evolution of the stress-strain behavior of a superelastic NiTi alloy over a range of cyclic frequencies up to 10 Hz is presented. Due to the stress-strain hysteresis typical of these alloys work is dissipated as heat during every cycle. Also, the heat release and absorption induced by the cyclic phase transformation responsible for the superelastic effect causes the material to undergo a cyclic temperature history which is superimposed on the average temperature resulting from the dissipative nature of the stress-strain cycle. As the cyclic frequency is increased the imposed strain rate is also necessarily increased. The stress-strain loops at very low frequencies are under isothermal conditions. As the cyclic rate is increased nearly adiabatic conditions are achieved at the higher frequencies. This affects the hysteretic cyclic behavior and the damping capacity of the material.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 459: Symposium Y – Materials for Smart Systems II , 1996 , 471
Copyright
Copyright © Materials Research Society 1997

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References

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