Damping of high-temperature shape memory alloys

Kirsten P. Duffy; Santo A. Padula II; Daniel A Scheiman

doi:10.1117/12.776288

2 April 2008 Damping of high-temperature shape memory alloys

Kirsten P. Duffy, Santo A. Padula II, Daniel A Scheiman

Proceedings Volume 6929, Behavior and Mechanics of Multifunctional and Composite Materials 2008; 69291C (2008) https://doi.org/10.1117/12.776288
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2008, San Diego, California, United States

Abstract

Researchers at NASA Glenn Research Center have been investigating high temperature shape memory alloys as potential damping materials for turbomachinery rotor blades. Analysis shows that a thin layer of SMA with a loss factor of 0.04 or more would be effective at reducing the resonant response of a titanium alloy beam. Two NiTiHf shape memory alloy compositions were tested to determine their loss factors at frequencies from 0.1 to 100 Hz, at temperatures from room temperature to 300°C, and at alternating strain levels of 34-35x10^-6. Elevated damping was demonstrated between the M_s and M_f phase transformation temperatures and between the A_s and A_f temperatures. The highest damping occurred at the lowest frequencies, with a loss factor of 0.2-0.26 at 0.1 Hz. However, the peak damping decreased with increasing frequency, and showed significant temperature hysteresis in heating and cooling.

Citation Download Citation

Kirsten P. Duffy, Santo A. Padula II, and Daniel A Scheiman "Damping of high-temperature shape memory alloys", Proc. SPIE 6929, Behavior and Mechanics of Multifunctional and Composite Materials 2008, 69291C (2 April 2008); https://doi.org/10.1117/12.776288

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