Importance of the Running-In Phase on the Life of Repairable Systems


The running-in phase is the first stage of the bearing lifespan. However, this phase is very short and extremely important for the future lifespan of the rolling bearing because it is what sets the stabilized state in terms of roughness of the parts in contact, residual geometry and surface residual stresses, which are key factors in the fatigue resistance of mechanical parts. Several numerical and experimental studies have highlighted the importance of the running-in phase in two scales (macroscopic, meso and microscopic). Due to its high flexibility, the approach presented in this work is a numerical modeling of the running-in phase which has been based on the Weibull distribution. The obtained results confirm the importance of the running-in phase on the lifespan of bearings or other mechanism whose functioning requires an adaptation phase of parts in contact. It also concludes that if the running-in phase has been performed correctly, there is a marked improvement in reliability. The curves describe the useful saved time of lifespan according to the scale of the running-in phase.

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Beleulmi, S. , Bellaouar, A. and Lachi, M. (2014) Importance of the Running-In Phase on the Life of Repairable Systems. Engineering, 6, 78-83. doi: 10.4236/eng.2014.62011.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] SINTEF Industrial Management, “Offshore Reliability Data (OREDA),” 4th Edition, 2002.
[2] H. Procaccia, P. Aufort and S. Arsenis, “The European Industry Reliability Data Bank (EIReDA),” 3rd Edition, 1998.
[3] L. L. C. Exida, “Electrical & Mechanical Component Reliability Handbook,” 2005.
[4] G. Thoquenne, “Prévisions des Durées de vie en Fatigue des Roulements,” Ph.D. Thesis, Ecole Polytechnique, 2004.
[5] M. Rausand and A. Hoyland, “System Reliability Theory, Models, Statistical Methods, and applications,” 2nd Edition, Editions Wiley, New Jersey, 2004.
[6] J. H. Horng, M.-L. Len and J.-S. Lee, “The Contact Characteristics of Rough Surfaces in Line Contact during Running-in Process,” Wear, Vol. 253, 2002, pp. 899-913.
[7] D. H. Kelly, C. G. Barnes, R. W. Freeman and G. W. Critchlow, “Running in and the Enchancement oh Scuffing Resistance,” Proceedings of IME, Vol. 206, pp. 425-429.
[8] C. C. Chou and J. F. Lin, “Tribological Effects of Roughness and Running-in on the Oil Lubricated Line Contacts,” Proceedings of IME, Vol. 211, 2002, pp. 209-222.
[9] P. Pawlus, “A Study on the Fonctionnal Properties of Honed Cylinders Surface during Running-in,” Wear, Vol. 176, No. 2, 1994, pp. 247-254.
[10] K. J. Carroll, “On the Use and Utility of the Weibull Model in the Analysis of Survival Data,” Controlled Clinical Trials, Vol. 24, No. 6, 2003, pp. 682-701.

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