Using the Foerster Rivet Check System to Detect Cracks Under Installed Fasteners

Abstract

The Foerster Rivet Check system is an instrument designed to detect cracks under installed fasteners in relatively thin layers of an aircraft skin. Its operation is based on a rotating self-nulling eddy current probe. It was found that the system is able to detect relatively small cracks under non-ferrous fasteners at depths up to 0.12" in layers of aircraft skin. The amplitude of its' output signal is proportional to flaw size and it is able to indicate the relative position of flaws. Interference from the presence of ferrous fasteners results in false indications. At present the system works well in the laboratory on flat surfaces, but modifications are required to make it more suitable for use under field conditions.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 2000
Accession Number
ADA382576

Entities

People

  • R. W. Nolan

Organizations

  • Defence Research and Development Canada

Tags

Communities of Interest

  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Aircrafts
  • Amplitude
  • Classification
  • Computers
  • Data Acquisition
  • Eddy Currents
  • Engineering
  • Fasteners
  • Field Conditions
  • Geometry
  • Inspection
  • National Security
  • Security
  • Signal Processing
  • Test Depths
  • Vehicles

Readers

  • Computer Science/Computer Engineering/Data Science/Digital Signal Processing.
  • Structural Health Monitoring of Composite Structures.