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


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/029130.pdf


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