Experimental Investigation of the Crack Growth Gage

Abstract

The objective of this program was to determine the feasibility of the crack growth gage as a more direct method for monitoring potential crack growth damage in fatigue critical areas of F-4 aircraft structure. The major task consisted on mounting crack growth gages on a full-scale F-4C/D fatigue test article and collecting crack growth data from the gages at specified intervals. Two additional tasks were comprised of (1) conducting a gage qualification test program in accordance with MIL-STD-810C (Environmental Test Method) requirements, and (2) determining an appropriate method for collecting data from the gage. Inconsistencies in constant amplitude test results and bonding problems encountered on the F-4C/D full-scale fatigue test article prevented the MIL-STD-810C qualification tests from being started. Results of this investigation indicated that further research and development of the crack growth gage concept is required before the gage can be recommended as a fleetwide tracking device.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1980
Accession Number
ADA089137

Entities

People

  • Donald R. Holloway

Organizations

  • Wright Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Acquisition
  • Air Force
  • Air Force Facilities
  • Aircraft Equipment
  • Aircrafts
  • Airframes
  • Data Acquisition
  • Environmental Tests
  • Fatigue Tests (Mechanics)
  • Materials
  • Measurement
  • Mechanics
  • Plastic Explosives
  • Strain Gages
  • Structural Components
  • Structural Integrity
  • Test Methods

Readers

  • Aerospace Engineering
  • Logistics and Supply Chain Management.
  • Structural Health Monitoring of Composite Structures.