Damping Characteristics of Metal Matrix Composites

Abstract

Damping data were obtained for Gr/Mg composites in the intermediate frequency range as a function of temperature at low strain amplitudes. A peak in damping was noted at 200 K (-73 C) which can be attributed to a phase transformation in graphite from rhombohedral to hcp structure. At temperatures above 373 K, the increase in damping could be attributed to the operative mechanisms in the matrix alloy. Flexural and extensional damping capacity of as-cast and heat treated Gr/K1A were also measured by using the test apparatus at the University of Idaho, Moscow, Idaho. These results indicated that flexural damping capacity of 1.5% at 80 Hz is quite consistent with the values previously obtained at Martin Marietta.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Dec 10, 1988
Accession Number
ADA204948

Entities

People

  • Mohan S. Misra

Organizations

  • Martin Marietta

Tags

DTIC Thesaurus Topics

  • Acoustic Emissions
  • Advanced Materials
  • Casting (Fabrication)
  • Centrifugal Casting
  • Composite Material Fabrication
  • Composite Materials
  • Fabrication
  • Grain Size
  • Graphitic Materials
  • Intermediate Frequencies
  • Load Cells
  • Materials
  • Materials Processing
  • Measurement
  • Metal Matrix Composites
  • Metals
  • Universities

Readers

  • Materials Science and Engineering.
  • Reinforced Composite Materials