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)
Evaluation of the crack gage concept for monitoring aircraft flaw growth potential
Bewertung eines Entwurfes fuer ein Risspruefgeraet fuer die Ueberwachung der Risseinleitung bei Flugzeugen
US Government Reports ; Jun ; 1-264
1979
264 Seiten
Report
Englisch
A crack growth gage for assessing flaw growth potential in structural components
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