F-4 Service Life Tracking Program (Crack Growth Gages)

Abstract

The objective of this program was to evaluate the ability of a crack growth gage to monitor potential crack growth damage in fatigue critical locations of F-4C/D aircraft structure. Crack growth gages were designed for use on the lower wing skin of F-4 aircraft. An element test program was performed to verify gage design and provide data for predicting gage behavior when attached to the fatigue test article. Results of those tests prompted performance of a supplemental test program to investigate effects of sheet thickness on crack growth retardation. Results from both of these test programs were used to develop procedures to predict crack growth in gages attached to the fatigue test article. Eight gages were bonded to the test article using room temperature cure adhesive after an elevated cure temperature adhesive failed. Results show gage crack growth is predictable. Analysis results.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1979
Accession Number
ADA083978

Entities

People

  • C. R. Saff

Organizations

  • McDonnell Aircraft Corporation

Tags

DTIC Thesaurus Topics

  • Adhesives
  • Air Force Facilities
  • Aircrafts
  • Airframes
  • Calibration
  • Fabrication
  • Fatigue Tests (Mechanics)
  • Fuselages
  • Manufacturing
  • Materials
  • Measurement
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Stress Intensity Factors
  • Stress Strain Relations
  • Stresses

Readers

  • Fluid Dynamics.
  • Materials Science (Mechanical Engineering).
  • Surface Coatings Technology.