INVESTIGATION OF ELASTIC WAVES IN THIN PLATES

Abstract

A survey of the theory of Lamb waves is given. Experiments were conducted to determine how thin a plate must be before the modes properly called Lamb waves will be excited. Measurements of group velocity of Lamb waves were made and the values agreed with calculated values. The analogy between sonic waves guided by elastic plates and electromagnetic waves is discussed. Measurements were made of the insertion loss caused (1) by artificial flaws consisted of 1/32 in.-wide sawcuts of varying depths, and (2) by eight different butt welds in 1/32 in.-steel plate. A method of locating flaws in plates by the use of Lamb waves showed promise.

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Document Details

Document Type
Technical Report
Publication Date
Jun 12, 1960
Accession Number
AD0257530

Entities

People

  • E. J. Tajchman
  • T. N. Grigsby

Organizations

  • Denver Research Institute

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Acoustic Waveguides
  • Acoustic Waves
  • Acoustics
  • Computational Science
  • Diffraction
  • Doppler Effect
  • Elastic Waves
  • Materials
  • Materials Testing
  • Phase Velocity
  • Sound Waves
  • Standing Waves
  • Two Dimensional
  • Ultrasounds
  • Wave Propagation
  • Waveforms

Readers

  • Aerodynamics/Aeronautics.
  • Microwave Engineering.
  • Structural Health Monitoring of Composite Structures.