Measurement of Damping Coefficients and Dynamic Modulus of Fiber Composites

Abstract

The experimental techniques developed to measure the material damping of FRP were exponential decay of a vibrating beam (free- ree mode) and forced vibration of double cantilever beam. By using Zener's anelastic damping values were calculated and compared with experimental damping values. Good agreement was achieved. The experimental techniques were then applied to FRP and boron-reinforced composites. It was found that damping values for the unidirectional fiberglass and boron composite specimens had approximately the same magnitude as those for the aluminum specimens. However, variations in fiber orientation produced a significant increase in damping coefficients. Also, the introduction of air damping produced an increase in the observed value of material damping. The parameters of stree level and frequency were controlled, and the effect of these parameters ont he values of material damping and dynamic modulus was observed and recorded.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1970
Accession Number
AD0869025

Entities

People

  • E. B. Paxson
  • L. T. Mazza
  • R. L. Rodgers

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Counter IED

DTIC Thesaurus Topics

  • Agreements
  • Army Aviation
  • Cantilever Beams
  • Composite Materials
  • Fiber Reinforced Composites
  • Fiber Reinforced Polymers
  • Fibers
  • Frequency
  • Materials
  • Materials Laboratories
  • Materials Testing
  • Measurement
  • Plastics
  • Reinforced Plastics
  • Resonant Frequency
  • Vibration

Readers

  • Mathematics or Statistics
  • Reinforced Composite Materials
  • Structural Dynamics.