Accession Number:

ADA275755

Title:

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

Descriptive Note:

Final rept. May-Dec 1990

Corporate Author:

INSTRON CORP CANTON MA

Personal Author(s):

Report Date:

1993-12-01

Pagination or Media Count:

101.0

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

Subject Categories:

  • Aircraft
  • Properties of Metals and Alloys
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE