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Fatigue Life Prediction of Drill-String Subjected to Random Loadings

[+] Author Affiliations
Jiahao Zheng, Hongyuan Qiu, Jianming Yang, Stephen Butt

Memorial University of Newfoundland, St John’s, NL, Canada

Paper No. IMECE2014-36009, pp. V04BT04A024; 11 pages
doi:10.1115/IMECE2014-36009
From:
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 4B: Dynamics, Vibration, and Control
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4648-3
  • Copyright © 2014 by ASME

abstract

Based on linear damage accumulation law, this paper investigates the fatigue problem of drill-strings in time domain. Rainflow algorithms are developed to count the stress cycles. The stress within the drill-string is calculated with finite element models which is developed using Euler-Bernoulli beam theory. Both deterministic and random excitations to the drill-string system are taken into account. With this model, the stress time history in random nature at any location of the drill-string can be obtained by solving the random dynamic model of the drill-string. Then the random time history is analyzed using rainflow counting method. The fatigue life of the drill-string under both deterministic and random excitations can therefore be predicted.

Copyright © 2014 by ASME

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