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Moisture assisted crack growth in ceramics

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Abstract

A method is described to study subcritical crack growth in ceramic materials. Large, macroscopic size cracks were used and quantitative crack velocity measurements were made on glass and sapphire as a function of applied force, temperature and environment. The measured crack velocity was a complex function of stress and water vapor concentration in the environment and portions of the data could be adequately explained by the stress corrosion theory of Charles and Hillig.

Résumé

Une methode est decrite pour l'étude de la croissance des fentes sous-critiques dans des materiaux ceramiques. Des fentes longues de grandeur macroscopique ont été utilizées et les mesures quantitatives de la vitesse de formation des fentes ont été pris dans du verre et du saphir comme une fontion de la force appliquéé, de la temperature et de Fentourage. La vitesse mesurée de la formation des fentes est une fonction complexe de la force et de la concentration de vapeur dans l'entourage, et part des resultats pouvait être expliquée suffisamment bien avec la théorie de Charles et Hillig pour la corrosion par la contrainte.

Zusammenfassung

Es wird über eine Methode zum Studium der unterkritischen Bruchfortpflanzung berichtet. Grosse, makroskopische Bruchspalten wurden beobachtet and zwar wurde die Bruchgeschwindigkeit in Glas and Saphir als Funktion von angewandter Kraft, Temperature and Atmosphäre gemessen. Die gefundene Bruchfortpflanzungsgeschwindigkeit stand in komplexer Beziehung zu Zugspannung und Wasserdampfkonzentration und ein Teil der Daten liess rich auf Grund der Spannungskorrosionstheorie von Charles und Hillig erklären.

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Authors and Affiliations

  1. National Bureau of Standards, U.S. Department of Commerce, Institute for Materials Research, Washington, USA

    S. M. Wiederhorn

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  1. S. M. Wiederhorn
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Wiederhorn, S.M. Moisture assisted crack growth in ceramics. Int J Fract 4, 171–177 (1968). https://doi.org/10.1007/BF00188945

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