The damping capacity of 6061 Al, mechanically alloyed Al-Mg alloy, and SiC particulate-reinforced Al-Cu alloy matrix composites has been investigated. The logarithmic decrement of freely decaying resonance oscillations of clamped-free cantilever beam specimens was measured over a wide range of resonant frequencies (300 Hz-12,000 Hz) in the first three modes of flexure. Damping capacity of the SiC particulate-reinforced Al-Cu alloy matrix composite exhibits a peak at about 1,318 Hz with a loss factor of 0.00352. Peak damping is 2.43 times and 2.82 times the damping capacity of the mechanically alloyed Al-Mg alloy and 6061 Al, respectively, at the same resonant frequency. At frequencies higher than 1,318 Hz, there is no significant difference in the damping response of the materials. The existence of the damping peak is unique to the particulate composite. A mechanism is proposed to explain the large energy dissipation causing the peak.
|Original language||English (US)|
|Number of pages||6|
|Journal||International Journal of Powder Metallurgy (Princeton, New Jersey)|
|State||Published - Oct 1989|
All Science Journal Classification (ASJC) codes
- Metals and Alloys
- Industrial and Manufacturing Engineering