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A Comparison of Fatigue Life Prediction Methodologies for Rotorcraft

A Comparison of Fatigue Life Prediction Methodologies for Rotorcraft

          
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About the Book

Because of the current U.S. Army requirement that all new rotorcraft be designed to a 'six nines' reliability on fatigue life, this study was undertaken to assess the accuracy of the current safe life philosophy using the nominal stress Palmgrem-Miner linear cumulative damage rule to predict the fatigue life of rotorcraft dynamic components. It has been shown that this methodology can predict fatigue lives that differ from test lives by more than two orders of magnitude. A further objective of this work was to compare the accuracy of this methodology to another safe life method called the local strain approach as well as to a method which predicts fatigue life based solely on crack growth data. Spectrum fatigue tests were run on notched (k(sub t) = 3.2) specimens made of 4340 steel using the Felix/28 tests fairly well, being slightly on the unconservative side of the test data. The crack growth method, which is based on 'small crack' crack growth data and a crack-closure model, also predicted the fatigue lives very well with the predicted lives being slightly longer that the mean test lives but within the experimental scatter band. The crack growth model was also able to predict the change in test lives produced by the rainflow reconstructed spectra. Everett, R. A., Jr. Langley Research Center RTOP 505-63-50-04...


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Product Details
  • ISBN-13: 9781729045190
  • Publisher: Independently Published
  • Publisher Imprint: Independently Published
  • Height: 279 mm
  • No of Pages: 36
  • Spine Width: 2 mm
  • Width: 216 mm
  • ISBN-10: 1729045197
  • Publisher Date: 21 Oct 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 109 gr


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