Calibration of a Pulsed Potential Crack Monitor for Use in Fatigue Crack Growth Studies

Abstract

Accurate measurement of crack length is a necessary criterion for detailed analysis of the fatigue (or fracture toughness) performance of a material. Several methods exist but one of the most versatile uses the phenomenon of potential drop. A pulsed direct current is used to generate a potential drop as a function of crack length. Experimental values of potential drop and crack length have been obtained for three test-piece geometries: a centre crack specimen, a holed specimen (AGARD), and a compact tension specimen. Computed values have been generated using a Fortran program and are compared with the experimental results. Comments are made on the accuracy of the technique and its consequences on potential probe positioning for both short and long cracks. Great Britain.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1989
Accession Number
ADA210958

Entities

People

  • A. Jefferson
  • J. Newman
  • P. D. Pitcher
  • P. J. Gregson

Organizations

  • Royal Aircraft Establishment

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Accuracy
  • Agreements
  • Aluminum Foil
  • Calibration
  • Computer Programs
  • Computers
  • Direct Current
  • Electrical Measurement
  • Electrical Resistance
  • Fatigue Tests (Mechanics)
  • Fracture (Mechanics)
  • Geometry
  • Materials
  • Measurement
  • Mechanics
  • Schematic Diagrams
  • Sensitivity

Readers

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