Rotating bending fatigue tests were made for the AAR on sixty-six shafts of 9 1/2 inches diameter. A press-fitted member was mounted on each shaft. Fatigue failure initiated in the shaft under the fitted member. Six different engineering steels were used for the shaft forgings. Some steels were normalized and tempered while others were quenched and tempered. Two groups of specimens were quenched below the critical temperature to develop residual compressive stresses in the surface zone. All shafts were run 85 million stress reversals unless breakage developed earlier. The maximum allowable bending stress of endurance limit to prevent the shaft breaking off under the fitted member for all normalized and tempered or quenched and tempered shafts ranged from 9,500 to 12,500 lb. per sq. in. The two groups of shafts given a subcritical quench gave endurance values of 18,000 and 19,000 lb. per sq. in.

  • Corporate Authors:

    Institution of Mechanical Engineers

    1 Birdcage Walk
    London SW1H 9JJ,   England 
  • Authors:
    • Horger, O J
  • Publication Date: 1956-9-14

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 11 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00040348
  • Record Type: Publication
  • Report/Paper Numbers: Conf Paper
  • Files: TRIS
  • Created Date: Jul 8 1994 12:00AM