Cyclic Stress Studies by Time-Averaged Photoelasticity,

Abstract

This paper describes an experimental method whereby the amplitude of cyclic stresses may be readily determined by time-averaged photoelasticity. Using an ordinary polariscope with a monochromatic light source, time-averaged isochromatics fringes are formed if the photographic film in the camera is exposed with an exposure time equal to one or several periods while the photoelastic model is undergoing steady state cyclic loading. The fringe pattern depicts amplitudes of the oscillating stresses according to the zeroth order Bessel function. These properties permit the determination of a time-averaged cyclic stress-optic law. It is also possible to use the method to determine time-averaged isoclinics. The method has great potentiality in the study of in-plane vibrations. (Author)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1976
Accession Number
ADA032086

Entities

People

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

Organizations

  • Oakland University

Tags

Communities of Interest

  • Air Platforms
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Amplitude
  • Bessel Functions
  • Cameras
  • Civil Engineering
  • Elastic Properties
  • Engineering
  • Light Sources
  • Measurement
  • Mechanics
  • Military Research
  • Photoelasticity
  • Photographic Film
  • Propellant Grains
  • Solid Propellants
  • Stress Waves
  • Two Dimensional
  • Waves

Readers

  • Calculus or Mathematical Analysis
  • Mechanical Engineering/Mechanics of Materials.
  • Optical Physics and Photonics.