Mechanical Vibration Testing Results of Acoustic Test Panels

Abstract

This report describes the mechanical vibration testing of two graphite reinforced composite plates. The plates were tested in a free-free boundary condition up to a frequency of approximately 6 kHz. The plates were designed to assess two different damping treatments. They consisted of a 1.37 inch thick carbon epoxy structural section with a 0.13 in thick region on one side for each treatment. One plate used a conventional constrained layer design, while the other used a thin free layer of fiber reinforced urethane. The results show that while the constrain layer damped plate has a higher energy dissipation potential, it also has a reduced stiffness. There is also some localized modal behavior, which suggests it may also be reduced in strength.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1998
Accession Number
ADA361932

Entities

People

  • Colin P. Ratcliffe
  • Roger M. Crane

Organizations

  • Naval Surface Warfare Center Carderock Division

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Composite Materials
  • Frequency
  • Frequency Response
  • Graphitic Materials
  • Materials
  • Mechanical Engineering
  • Military Research
  • Modal Analysis
  • Resonant Frequency
  • Shape
  • Stiffness
  • Surface Warfare
  • Test Methods
  • United States
  • United States Naval Academy
  • Urethanes
  • Vibration

Fields of Study

  • Materials science

Readers

  • Reinforced Composite Materials
  • Structural Dynamics.