An analysis has been made of the results of residual static strength tests of loaded pin-lug specimens containing fatigue cracks, using linear elastic fracture mechanics. In the group of 34 specimens concerned there was a wide variation of cracked area, crack asymmetry, and crack front shape. The analysis was performed on the basis of five different assumptions regarding the definition of crack length with a curved or irregular crack front. The definitions of length included maximum distance from the pin centre-line to any point on the crack front, average distance from the centre-line to the crack front and average length of the cracks observable on the flat surfaces of the lug measured from the pin centre-line (considered on each side of the hole separately). The results of the analysis showed that the above methods of definition of crack length generally resulted in comparatively small differences in predicted values of crack tip stress intensity factor. The predicted values of K at failure did not agree well with measured values of Kc for the material concerned. The errors were generally such that a conservative (safe) estimate of residual strength would be made in engineering prediction except at very short crack lengths.


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    Title :

    A fracture mechanics study of the residual strength of pin-lug specimens


    Additional title:

    Studie der Bruchmechanik zur Bewertung der Reststaerke von Stiften als Probestuecke


    Contributors:
    Kirkley, W.T. (author) / Rooke, D.P. (author)


    Publication date :

    1976


    Size :

    22 Seiten, 9 Bilder, 7 Tabellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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