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Prot fatigue study of an aircraft steel in the ultra high strength range

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Abstract

Fatigue properties were determined, using the Prot method, for a Ni-Cr-Mo-V steel (AMS-6434) in the ultra high tensile strength range up to 280 ksi. A useful increase in fatigue strength of carefully ground specimens was found up to about 240 ksi tensile strength with an endurance ratio of from 0.40 to 0.42. Above this level the fatigue strength appeared to level off, or drop slightly. Comparison with the Wohler method showed worth-while savings in specimens and test time through use of the Prot progressively increasing load method. Some trend for failure stress to decrease as inclusion size increased was noted.

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Authors and Affiliations

  1. Metallurgical Research Dept., A. O. Smith Corp., Milwaukee, Wisc., USA

    P. W. Ramsey (Member AIME) & D. P. Kedzie (Junior Member AIME)

Authors
  1. P. W. Ramsey
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  2. D. P. Kedzie
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Additional information

TP 4395E. Manuscript, Apr. 16, 1956. Cleveland Meeting, October 1956.

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Ramsey, P.W., Kedzie, D.P. Prot fatigue study of an aircraft steel in the ultra high strength range. JOM 9, 401–406 (1957). https://doi.org/10.1007/BF03397886

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  • DOI: https://doi.org/10.1007/BF03397886

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