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    Fatigue Tests Of Large Alloy Steel Shafts

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    Fatigue tests are being made on 9-in. diameter unnotched shafts and 8 1/2-in. diameter notched shafts. This paper is a progress report on work accomplished to date. Also included are results obtained on 0.469-in. diameter specimens removed from one of the large shafts broken. The large diameter shafts are tested in a rotating-beam type machine in which load is applied to the shaft by misalignment of the bearings. Small diameter specimens were tested in a rotating-cantilever machine. Limited data obtained thus far indicates a considerably lower fatigue limit for the large diameter unnotched shafts than that obtained of the small diameter specimens. No discussion of the apparent size effect indicated is given, pending completion of testing on the large shafts and further sampling of small specimens.

    Author Information:

    Eaton, F. C.
    Supervisory Engineer, Westinghouse Electric, Corp., Lester, Pa.

    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP45766S