A Forced Vibration Non-Resonant Method for the Determination of Complex Modulus in the Audio Frequency Range

Abstract

A forced-vibration, non-resonant method for the determination of the dynamic mechanical properties of elastomeric materials in the audio frequency range was developed and evaluated using a commercial damping material, Isodamp C-1002 from EAR Specialty Composities. Measurements of storage modulus and loss factor were made in the 11 Hz to 10 kHz range on the damping material using compressive and tensile excitation. The elastomer had a loss factor near 1.0 and a storage modulus which varied between 6 x 106 Pa and 3 x 108 Pa in the frequency range studied. For tensile excitation, the error in the calculated modulus was low up to the resonance frequency of the sample, usually -1700 Hz. For compressive excitation of thin sheets, the error was greatest at the low and high ends of the frequency range.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1992
Accession Number
ADA247759

Entities

People

  • Jeffrey P. Szabo

Organizations

  • Defence Research and Development Canada

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Amplifiers
  • Audio Frequency
  • Classification
  • Composite Materials
  • Elastomers
  • Frequency
  • Mass Spectrometry
  • Materials
  • Measurement
  • Mechanical Properties
  • Modulus Of Elasticity
  • Polymers
  • Resonance
  • Security
  • Spectra
  • Spectrometry
  • Vibration

Fields of Study

  • Materials science

Readers

  • Acoustics.
  • Mechanical Engineering/Mechanics of Materials.
  • Structural Dynamics.