Effects of thermomechanical processing on damping characteristics of martensitic Cu 13.5 w/o Al alloy for ship silencing application
Kelly, Edward William
Perkins, A. Jeff
MetadataShow full item record
Cu-Al alloys demonstrate a high damping capacity in the martensitic state. The specific damping capacity in the y' martensite of a Cu-13.5w/o Al alloy was found to vary with grain size. Since platelet length increased with grain size while platelet width remained relatively invariant, it can be inferred that martensitic platelet motion was an active mechanism for damping. Several thermomechanical processes were explored to establish positive grain size control. It was found that grain nucleation and recrystallization and grain growth were very sensitive to the usual parameters of prior strain, strain rate, annealing temperature and annealing time. Severe brittleness, reversible shape memory effects, and pseudoelasticity were encountered during the process experimentation.
RightsThis 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.
Showing items related by title, author, creator and subject.
Cronauer, Joseph T. (1987);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 ...
Song, G.; N. Buck; Agrawal, B.N. (1997);Minimizing vibrations of a exible spacecraft actuated by on-off thrusters is a challenging task. This paper presents the rst study of pulse-width pulse-frequency modulated thruster control using command input shaping. ...
Meyer, J.; Harrington, W.; Agrawal, B.N.; Song, G. (1998);This paper presents the results of positive position feedback (PPF) control and linear–quadratic Gaussian (LQG) control for vibration suppression of a ﬂexible structure using piezoceramics. Experiments were conducted on ...