The results of a test program to evaluate the ability of a bonded-on precracked coupon to monitor the growth of flaws in the basic structure are included. All testing utilized 7075-T651 aluminum from a single plate. Both constant thickness and stepped crack gages were evaluated. Evaluation of a wide range of sensitivity in crack gage crack growth response was made. Structure flaws of (1) corner flaw at a hole, (2) through flaw at a hole, and (3) center notch flaw were evaluated. The cyclic test loading included constant amplitude of two R ratios and three representative aircraft usage flight profiles. Strain gage instrumentation was used to measure structure stresses and load transferred into the crack gages. (DePo)


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    Title :

    Evaluation of the crack gage concept for monitoring aircraft flaw growth potential


    Additional title:

    Bewertung eines Entwurfes fuer ein Risspruefgeraet fuer die Ueberwachung der Risseinleitung bei Flugzeugen


    Contributors:

    Published in:

    Publication date :

    1979


    Size :

    264 Seiten


    Type of media :

    Report


    Type of material :

    Print


    Language :

    English




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