Direct Determination of Flexural Strains in Plates Using Projected Gratings,

Abstract

It is proposed in this paper to use projected gratings to determine principal strains in plates subjected to bending. The method requires the rotation of one photograph of the deformed grating over a copy of itself, the rotation taking place about the point at which the bending strains are desired. The idea previously suggested by Stetson to double differentiate holograms of bent plates has been extended and verified with an application to a plate subjected to twisting. The proposed method is easy to use and permits the determination of principal strains in plates subjected to much larger deflections than the ones that can be studied using holograms. Suggestions to improve the precision of the determination are also made. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1977
Accession Number
ADA041917

Entities

People

  • Augusto J. Durelli
  • C. Y. Liang
  • J. D. Hovanesian
  • Y. Y. Hung

Organizations

  • Oakland University

Tags

Communities of Interest

  • Ground and Sea Platforms
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Applied Mechanics
  • Civil Engineering
  • Deflection
  • Engineering
  • Holograms
  • Materials
  • Measurement
  • Mechanical Engineering
  • Mechanics
  • Military Research
  • Photographs
  • Physics Laboratories
  • Propellant Grains
  • Solid Propellants
  • Three Dimensional
  • Two Dimensional

Readers

  • Optical Physics and Photonics.
  • Structural Dynamics.
  • Systems Analysis and Design