Accession Number:

ADA114633

Title:

Damping Characteristics of Metal Matrix Composites.

Descriptive Note:

Final rept. Mar 81-Jan 82,

Corporate Author:

BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA

Personal Author(s):

• Timmerman,Nancy S.

Report Date:

1982-04-01

Pagination or Media Count:

31.0

Abstract:

Nine metal matrix composite materials were tested over the frequency range 4 to 10,000 Hz, at room temperature, to determine their damping properties. Cantilever beam samples were measured using both a logarithmic decrement test and a resonant dwell test to cover the entire frequency range. At a peak stress of 5 ksi, measured loss factors ranged from about .0003 to .004, with the graphitealuminum composites generally showing the best highest performance loss factor. These values are measurably no greater than those obtainable on the unreinforced matrix alloys. Author

Descriptors:

• *Composite materials
• *Matrix materials
• *Metals
• *Damping
• Vibrational spectra
• Room temperature
• Test methods
• Cantilever beams
• Stresses
• Graphite
• Aluminum
• Aluminum alloys
• Silicon carbides
• Magnesium
• Classification
• Modulus of elasticity

Subject Categories:

• Laminates and Composite Materials
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE