K solutions for internal surface cracks in pressurized cylinders are compared, including Smith's photoelastic results, Hussain's collocation and compliance results, and Underwood's estimates. Fatigue crack growth observations from cannon tubes are described, particularly in relation to surface crack-growth and multiple cracks. A method is proposed for describing quantitatively the effect of residual stress on K in cylinders with shallow cracks. The combination of compressive residual stress with applied stress reduces Delta K and thus increases fatigue life. (Se)
Surface crack K-estimates and fatigue life calculations in cannon tubes
Oberflaechenrisse in Geschuetzrohren - Schaetzung des K-Werts und Lebensdauerberechnung
Part-through crack fatique life prediction. ASTM symp. ; 687 ; 195-210
1979
16 Seiten, 13 Bilder, 2 Tabellen, 10 Quellen
Conference paper
English
Ultrasonic thickness variation measurement of hot forged cannon tubes
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