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A mechanism for sub-surface median crack initiation in glass during indenting and scribing

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Abstract

The initiation of sub-surface median cracks in glass during indenting and scribing is studied. It is shown that the zone of intense deformation under the tool introduces a weak singularity which may have a strong influence on crack initiation. When combined with a crack nucleus, which need only be of the order of the dimensions of the glass network, the weak singularity allows the threshold load for median cracking to be estimated. This estimate is shown to be in good agreement with experimental observations. The analysis explains the sudden transition from brittle to ductile behaviour in glass and also provides a possible explanation for the origin of the elusive “Griffith flaws”.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of California, 94720, Berkeley, California, USA

    Weili Cheng & Iain Finnie

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  1. Weili Cheng
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  2. Iain Finnie
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Cheng, W., Finnie, I. A mechanism for sub-surface median crack initiation in glass during indenting and scribing. J Mater Sci 25, 575–579 (1990). https://doi.org/10.1007/BF00714077

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  • DOI: https://doi.org/10.1007/BF00714077

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