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.
Fatigue Life Prediction of Drill-String Subjected to Random Loadings
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Zheng, J, Qiu, H, Yang, J, & Butt, S. "Fatigue Life Prediction of Drill-String Subjected to Random Loadings." Proceedings of the ASME 2014 International Mechanical Engineering Congress and Exposition. Volume 4B: Dynamics, Vibration, and Control. Montreal, Quebec, Canada. November 14–20, 2014. V04BT04A024. ASME. https://doi.org/10.1115/IMECE2014-36009
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