AN APPRAISAL OF THE PROT METHOD OF FATIGUE TESTING. PART 2

Abstract

The Prot method was applied to an unaged iron, an SAE 2340 steel, and a 14-B-50 boron steel. The modified theory, in which the exponent n was different for different metals, resulted in better agreement with conventional fatigue data. The endurance limits for the unaged iron were 16 to 25% higher than the values obtained by the conventional method. Better results were obtained with a value n = 0.371 than were obtained with n = 0.5. For the ferrous metals, n was reasonably close to 0.5 (0.37 < n < 0.71) in all cases. The Prot data for 14-B-50 steel were interpreted by the general method of least squares as a means of obtaining a suitable value of n. The advantage of the method was that only data obtained with progressively increasing loads were required. A method of estimating the standard deviation of the fracture stress at alpha = 0 was presented which gave reasonable estimates of variability for the cases investigated.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1953
Accession Number
AD0015781

Entities

People

  • H. T. Corten
  • Masaki Sugi
  • T. J. Dolan
  • Todor Dimoff

Organizations

  • University of Illinois Urbana–Champaign

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  • Air Platforms
  • Energy and Power Technologies

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  • Aluminum Alloys
  • Applied Mechanics
  • Computations
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  • Experimental Design
  • Materials
  • Materials Laboratories
  • Mathematical Analysis
  • Mechanics
  • Military Research
  • Notch Sensitivity
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  • Standards
  • Tensile Properties

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