A comparison of high damping shape memory alloys with Cu-Mn-based and Fe-Cr-based alloys.
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Authors
Cronauer, Joseph T.
Subjects
High Damping
Shape memory alloys
Ti - Ni
Cu - Zn - Al
Fe - Tr - Mo
Cu - Mn - Al
Shape memory alloys
Ti - Ni
Cu - Zn - Al
Fe - Tr - Mo
Cu - Mn - Al
Advisors
Perkins, Jeff
Date of Issue
1987
Date
June 1987
Publisher
Monterey, CA; Naval Postgraduate School
Language
en_US
Abstract
The strain dependence and temperature dependence of
damping in the thermoelastic martensitic (shape memory)
alloys titanium-nickel and copper-zinc-aluminum was compared
to predetermined optimum damping behavior in the "quiet"
alloys copper-manganese-aluminum and iron-chromiummolybdenum.
Damping measurements were taken using a
modified resonant dwell technique, in which cantilever beams
were evaluated for damping at their first three resonant
modes at temperatures between ambient and 110°C.
Differential scanning calorimetry was used to correlate
microstructural changes with damping capacity. All alloys
that were conditioned for high damping showed a trend of low
damping at low strains, a strain threshold, and increased
damping with strains above the threshold. Damping was
directly related to the progress of martensitic
transformation in the Ti-Ni alloy. The Cu-Zn-Al alloy was
examined in a condition which did not develop high damping.
Damping in the Fe-Cr-Mo alloy was insensitive to temperature
change. The damping of the Fe-Cr-Mo alloy was sensitive to
temperature and time at temperature.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
103 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.