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Review and extension of compliance information for common crack growth specimens

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Abstract

Elastic compliance expressions for compact type (CT) and WOL specimens have been formulated for a wide range of crack lengths (0.2 ⩽a/W ⩽ 0.975) using results from Newman's modified boundary collection techniques and Wilson's deep crack analysis. The location of the axis of rotation of the specimen arms at various crack lengths has been calculated and subsequently used in a proposed extrapolation technique to predict compliance at any location of the specimen convenient for measuring deflection during a crack growth test. The predicted compliances were found to be in excellent agreement with expreimental values for the two specimen types considered. Compliance expressions are also included for the center crack tension specimen.

Résumé

Des expressions de compliance élastique pour des éprouvettes du type compacte (CT) et WOL ont été formulées pour une gamme large de longueurs de fissuration (a/W compris entre 0.2 et 0.975) en utilisant les résultats tirés de l'application des techniques modifiées de collationnement aux frontières selon Newman ainsi que de l'analyse d'une fissure profonde d'après Wilson. La localisation de l'axe de rotation des bras de l'éprouvette pour différents longueurs de fissure a été calculée et utilisée en conséquence dans une technique d'extrapolation proposée pour prédire la compliance à toutes localisations de l'éprouvette convenant pour la mesure de la déflection durant un essai de croissance de fissure. Les compliances prédites ont été trouvées en excellent accord avec les valeurs expérimentales pour les deux types d'éprouvette considérés. Les expressions de compliance ont également été formulées pour un éprouvette de traction à fissure centrale.

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Saxena, A., Hudak, S.J. Review and extension of compliance information for common crack growth specimens. Int J Fract 14, 453–468 (1978). https://doi.org/10.1007/BF01390468

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  • DOI: https://doi.org/10.1007/BF01390468

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