Characterization of crack-tip strain singularity in brittle-microcracking materials by means of the photoelastic-coating method

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Abstract

The strain fields ahead of crack tips in rock, mortar, and graphite were measured using a photoelastic coating method. A transparent ferroelectric ceramic was used as a coating material to observe the photoelastic fringe pattern. A coating plate of 110-150 μm thick was placed on single-edge-notch specimens, and photoelasticity experiments were conducted in three-point bending under a polarizing microscope. The results show that the principal-strain difference ahead of the crack tip is given by {Mathematical expression} where σult is the ultimate tensile strength, r is the distance from the crack tip, and 9e{open}o and m are material constants. Based on this observation, the use of the JIc concept in determining the fracture toughness of brittle-microcracking materials is discussed.

Original languageEnglish
Pages (from-to)307-311
Number of pages5
JournalExperimental Mechanics
Volume29
Issue number3
DOIs
Publication statusPublished - 1989 Sep 1

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

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