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The surface energy of a running crack in Al2O3, MgO and glass from crack-branching measurements

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Abstract

The surface energy γr of a running crack in thin plates of Al2O3, MgO and glass is deduced from the crack length at which branching. occurs. If the stress on the running crack is low, the surface energy approaches the intrinsic value. But, if the stress on the running crack is raised, γr can become a number of times greater than the intrinsic value, suggesting that plastic deformation accompanies the crack.

Résumé

L'energie de surface γr d'une déchirure dans des plaques minces d'Al2O3, MgO et de verre, est déduite de la longueur d'une déchirure ou l'embranchement se produit. Si la contrainte dans la déchirure qui se forme est faible, l'energie de surface approche la valeur intrinsèque. Mais si la contrainte dans la déchirure augmente, γr peut devenir un nombre de fois plus grand que la valeur intrinsèque, mentionnant toutefois que la déformation plastique accompagne la déchirure.

Zusammenfassung

Die Oberflaechenenergie γr eines sich fortpflanzenden Bruches in einer duennen Platte aus A1203, MgO oder Glas wird mit Hilfe derjenigen Bruchlaenge, bei der Verzweigung auftritt, bestimmt. Wean die Spannung auf den wanderden Bruch klein is, naehert sich die Spannung dem intrinsischen Wert. Wenn die Spannung jedoch erhoeht wird, nimmt γr vielfache Werte des intrinsischen Wertes an, was nahelegt, dass der Bruch mit piastischer Verformung verbunden ist.

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Authors and Affiliations

  1. Department of Metallurgy, University of Newcastle upon Tyne, Newcastle upon Tyne, UK

    N. J. Petch

Authors
  1. J. Congleton
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  2. N. J. Petch
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Congleton, J., Petch, N.J. The surface energy of a running crack in Al2O3, MgO and glass from crack-branching measurements. Int J Fract 1, 14–19 (1965). https://doi.org/10.1007/BF00184150

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  • DOI: https://doi.org/10.1007/BF00184150

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