Publication:
A comparison of high damping shape memory alloys with Cu-Mn-based and Fe-Cr-based alloys.

Loading...
Thumbnail Image
Authors
Cronauer, Joseph T.
Subjects
High Damping
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
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
Other Units
Naval Postgraduate school
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.
Collections