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

PDF Url : ADA114633

Report Date : Apr 1982

Pagination or Media Count : 31

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 graphite/aluminum 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