Acoustic Measurement of the Mechanical Properties of Thin Material Specimens

Abstract

An acoustic technique is presented which permits accurate measurement of the dynamic Poisson's ratio, and the Young's, shear, and bulk moduli for a specimen which exists as a thin (<10 mil) layer. This technique should prove especially useful in situations where a bulk specimen is either not readily available or would not properly reflect the properties of the material when configured as a thin layer. The report includes a detailed discussion of the theory underlying the technique. As a test, three materials which could be easily formed into both a thin specimen and a thick specimen were selected. The technique was then used to determine the Poisson's ratio and acoustic velocities of the material constituting each thin specimen. These values were then contrasted to those of the bulk specimens obtained in a more conventional manner. The technique, as presented, could be extended for a number of applications, including the cure monitoring of adhesives.

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Document Details

Document Type
Technical Report
Publication Date
May 15, 1992
Accession Number
ADA253538

Entities

People

  • E. C. Johnson
  • J. D. Pollchik
  • J. N. Schurr

Organizations

  • The Aerospace Corporation

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Impedance
  • Acoustic Measurement
  • Acoustic Velocity
  • Acoustic Waves
  • Adhesives
  • Air Force
  • Classification
  • Coefficients
  • Frequency
  • Impedance
  • Materials
  • Measurement
  • Mechanical Properties
  • Resonant Frequency
  • Secondary Waves
  • Security
  • Space Systems

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Mechanical Engineering/Mechanics of Materials.
  • Systems Analysis and Design