Nondestructive Measurement of Residual Stresses in Aircraft Transparencies

Abstract

This program was conducted to: 1) Design, fabricate, and set up a photoelastic test apparatus capable of measuring residual stresses in aircraft transparencies; 2) Evaluate the accuracy of the scattered-light photoelastic technique by conducting scattered-light photoelastic experiments on four-point bending polycarbonate specimens having known analytical solutions and other experimental solutions; 3) Establish a scattered-light photoelastic experimental procedure for monolithic polycarbonate F-16 transparencies by measuring residual stresses at a typical station on the transparency; 4) Evaluate the scattered- light photoelastic properties of acrylic plastic material; and 5) Determine the feasibility of using acoustic wave ultrasonic techniques to determine residual stresses in transparencies. Keywords: Optical measurement, Acoustic measurement, Residual stress, Scattered-light photoelasticity, Jet fighter transparency, Surface wave, Ultrasonic tests.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1989
Accession Number
ADA218680

Entities

People

  • B. B. Raju
  • Blaine S. West

Organizations

  • University of Dayton

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Acoustic Waves
  • Air Force
  • Data Acquisition
  • Engineering
  • Materials Laboratories
  • Materials Processing
  • Measurement
  • Mechanics
  • Modulus Of Elasticity
  • Photographic Film
  • Plastic Explosives
  • Refractive Index
  • Stress Strain Relations
  • Test And Evaluation
  • Test Facilities
  • Waveplates

Readers

  • Aerospace Engineering
  • Structural Health Monitoring of Composite Structures.