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Damping of High-temperature Shape Memory AlloysResearchers 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(exp -6). Elevated damping was demonstrated between the M(sub s) and M(sub f) phase transformation temperatures and between the A(sub s) and A(sub 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. Keywords: High-temperature, shape memory alloy, damping, aircraft engine blades, NiTiHf
Document ID
20080012736
Document Type
Conference Paper
Authors
Duffy, Kirsten P. (Toledo Univ. Toledo, OH, United States)
Padula, Santo A., II (NASA Glenn Research Center Cleveland, OH, United States)
Scheiman, Daniel A. (ASRC Aerospace Corp. Brook Park, OH, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2008
Subject Category
Aircraft Propulsion and Power
Meeting Information
Nondestructive Evaluation and Health Monitoring(San Diego, CA)
Funding Number(s)
WBS: WBS 561581.02.08.03.15.03
CONTRACT_GRANT: NNC07TA60T
Distribution Limits
Public
Copyright
Public Use Permitted.

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