INVESTIGATION OF EFFECT OF NOTCHES ON ELEVATED-TEMPERATURE FATIGUE STRENGTH OF N-155 ALLOY

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.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Apr 26, 1954
Accession Number
AD0029130

Entities

People

  • C. A. Hoffman

Tags

DTIC Thesaurus Topics

  • Aeronautics
  • Air Force
  • Air Force Facilities
  • Alloys
  • Contracts
  • Cooperation
  • Frequency
  • Gas Turbines
  • Government Procurement
  • Governments
  • Heat Resistant Alloys
  • Heat Treatment
  • Materials
  • Notch Sensitivity
  • Resonant Frequency
  • Stress Concentration
  • Stresses

Readers

  • Aerodynamics/Aeronautics.
  • Materials Science (Mechanical Engineering).
  • Polymer Science and Engineering.