Accession Number : AD0029130
Title : INVESTIGATION OF EFFECT OF NOTCHES ON ELEVATED-TEMPERATURE FATIGUE STRENGTH OF N-155 ALLOY
Descriptive Note : Research memo.
Corporate Author : NASA CENTER FOR AEROSPACE INFORMATION BALTIMORE MD
Personal Author(s) : Hoffman, C A
Report Date : 26 Apr 1954
Pagination or Media Count : 12
Abstract : An investigation of the effect of notches on the fatigue strength of N-155 alloy at elevated temperatures was conducted by the NACA in cooperation with the Gas Turbine Panel of the Joint A.S.T.M.-A.S.M.E. Committee on Effects of Temperature on the Properties of Metals. Studies were made at 1350 deg and 1500 deg F in completely reversed bending. The results on relatively few specimens indicated that: (a) Notches reduced fatigue strength at l350 deg F by approximately 34 to 40 percent and at l500 deg F by approximately 30 to 37 percent over the range of 3 to 150 hours, and (b) the notch sensitivity in fatigue under conditions of completely reversed bending at 1350 deg and l500 deg F was considerably less than that predicted for static bending under elastic conditions.
Descriptors : *NOTCH SENSITIVITY , *HEAT RESISTANT ALLOYS , TEMPERATURE , BENDING , FATIGUE(MECHANICS)
Subject Categories : Properties of Metals and Alloys
Distribution Statement : APPROVED FOR PUBLIC RELEASE