NOTCH SENSITIVITY OF AIRCRAFT STRUCTURAL AND ENGINE ALLOYS PART II. FURTHER STUDIES WITH A-286 ALLOY

摘要

Sufficient data on a single lot of A-286 alloy were obtained at 1200°F to permit future evaluation of an analysis for notched-bar rupture life in terms of normal creep-rupture properties.nCircumferential notches with theoretical stress concentration factors (Kt) of 3. 0 or less increased rupture time of materials with a 2200℉solution temperature, despite smooth-bar elongations as low as 0.5% or below.nNotch behavior varied widely with notch geometry in tests on specimens with 1800℉ solution temperature. Transition to notch sensitivity at longer time periods was, however, positively demonstrated for several notch geometries.