Problems in the Acoustic Determination of the Modulus of Fibers

Abstract

Equipment was built to measure the Young's modulus of fibers using ultrasonic pulses. Moduli measured on single straight strands of aluminum and copper wire are in satisfactory agreement with accepted values. Moduli measured on carbon fiber yarns are as much as 45% lower than the static values. This difference arises because the individual filaments in the yarn are not straight but are twisted into a helix. This is verified by measurements on multiple stranded copper wire and theoretical calculations. (Author, modified-PL)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jul 31, 1972
Accession Number
AD0749011

Entities

People

  • Bruce Hartmann
  • Jacek Jarzynski

Organizations

  • Naval Ordnance Laboratory

Tags

DTIC Thesaurus Topics

  • Acoustic Measurement
  • Acoustic Propagation
  • Agreements
  • Aluminum
  • Carbon Fibers
  • Chemistry
  • Commercial Equipment
  • Fiber Reinforced Composites
  • Fibers
  • Filaments
  • Materials Laboratories
  • Materials Science
  • Measurement
  • Modulus Of Elasticity
  • Munitions
  • Ordnance Laboratories
  • Sound Waves

Fields of Study

  • Physics

Readers

  • Electrical Engineering
  • Materials Science and Engineering.
  • Reinforced Composite Materials