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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

$$\Delta \in = \Delta \in _o [(J/\sigma _{ult} )/r]^m $$

whereσ ult is the ultimate tensile strength,r is the distance from the crack tip, and9ɛ o andm are material constants. Based on this observation, the use of theJ Ic concept in determining the fracture toughness of brittle-microcracking materials is discussed.

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  1. Research Institute for Strength and Fracture of Materials, Faculty of Engineering, Tohoku University, Aza-Aoba Aramaki, 980, Sendai, Japan

    Toshiyuki Hashida (Research Associate)

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  1. Toshiyuki Hashida
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Hashida, T. Characterization of crack-tip strain singularity in brittle-microcracking materials by means of the photoelastic-coating method. Experimental Mechanics 29, 307–311 (1989). https://doi.org/10.1007/BF02321413

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  • DOI: https://doi.org/10.1007/BF02321413

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