Effect of crack length measurement technique and data reduction procedures on the perceived toughness from four-point bend end-notched flexure tests

A. Joseph Vinciquerra, Barry D. Davidson

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

Results are presented from a study to determine the most appropriate crack length measurement and data reduction techniques for use with the four-point bend end-notched flexure test. Using two different graphite/epoxy materials, the variability in crack length measurements due to different observers and/or measurement techniques, including visual observation and ultrasonic inspection, and their effects on the perceived values of the mode II delamination toughness, GIIc were evaluated for two different data reduction techniques. It was found that a technique using pretest compliance calibrations is the only approach that will produce accurate non-precracked and precracked values of GIIc regardless of the material being tested or the nature of crack advance. For those materials where GIIc values, as obtained by the more common approach that utilizes compliance values obtained during the test, agree with those obtained by compliance calibration, the results from the more common approach may be applied to obtain resistance curve toughnesses.

Original languageEnglish (US)
Pages (from-to)1051-1062
Number of pages12
JournalJournal of Reinforced Plastics and Composites
Volume23
Issue number10
DOIs
StatePublished - Jul 29 2004

Keywords

  • 4ENF
  • Delamination
  • Fracture
  • Graphite/ epoxy
  • Interlaminar crack
  • Laminated
  • Mode II

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Polymers and Plastics
  • Materials Chemistry

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