Development of Alternating Current Potential Drop (ACPD) Procedures for Crack Detection in Aluminum Aircraft Panels

Abstract

The Alternating Current Potential Drop (ACPD) method is investigated as a means of making measurements in laboratory experiments on the initiation and growth of multiple site damage (MSD) cracks in a common aluminum alloy used for aircraft construction. Procedures for instrumenting MSD test specimens are recommended. The ACPD method is found to be capable of (1) detecting crack initiation at a crack length of the order of 1 mm; (2) monitoring crack propagation at a resolution of the order of 5 micrometers; and (3) providing an indirect measurement of crack extension in R-curve type tests of fastener hole details. AC Potential drop, Crack growth, Fatigue, Fracture, R-Curve, Stable crack extension

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1993
Accession Number
ADA275755

Entities

People

  • D. A. Jablonski

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Aircraft Panels
  • Aircrafts
  • Alloys
  • Alternating Current
  • Aluminum
  • Aluminum Alloys
  • Computer Programs
  • Computers
  • Crack Propagation
  • Cracks
  • Cyclic Tests
  • Frequency
  • Geometry
  • Materials
  • Measurement
  • Plastic Explosives

Readers

  • Aerospace Test and Evaluation
  • Materials Science (Mechanical Engineering).
  • Systems Analysis and Design