Abstract
The fatigue crack growth model proposed by Frost and Dixon, based on the different crack tip geometries of a loaded and unloaded crack, is restated and extended using the stress intensity factor concept. The resulting crack growth predictions agree reasonably well both with experimental fatigue crack growth data, and data on the threshold stress necessary for fatigue crack growth.
Résumé
Le modèle de propagation des fissures de fatigue proposé par Frost et Dixon, qui repose sur les différences de géométrie de l'extrémité d'une fissure selon que celle-ci est sous contrainte ou déchargée, est reformulé et étendu, en utilisant le concept de facteur d'intensité de contrainte.
Les prédictions de propagation de fissure qui résultent de cette nouvelle expression sont en bon accord avec les données expérimentales de propagation des fissures en fatigue, ainsi qu'avec la valeur critique de la contrainte, nécessaire pour que cette propagation ait lieu.
Zusammenfassung
Das von Frost und Dixon vorgeschlagene Modell der Fortpflanzung von Ermüdungsrissen, welches auf den Unterschieden in der Geometrie einer belasteten und einer nicht belasteten Probe beruht, wird unter Hinzuziehen des Begriffs des Spannungsintensitätsfaktors neu formuliert und erweitert.
Die sich aus dieser neuen Formulierung ergebenden Voraussagen stehen in guter Übereinstimmung mit den experimentellen Werten, welche für das Fortschreiten von Ermüdungsrissen und die für die Fortpflanzung des Risses erforderliche kritische Belastung ermittelt wurden.
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Pook, L.P., Frost, N.E. A fatigue crack growth theory. Int J Fract 9, 53–61 (1973). https://doi.org/10.1007/BF00035955
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DOI: https://doi.org/10.1007/BF00035955