Novel Service Lifetime Estimation for an Oil-Damper Rubber Bush for a Railway Vehicle

Abstract:

A railroad bogie's components experience repeated loading during service. Especially, the oil-damper rubber bush becomes fatigue fractured on the plane between the rubber and the steel stem during service, and this results in inferior performance of the bogie. In this study, in order to offer a proper maintenance method for the bush, a novel service lifetime estimation for an oil-damper rubber bush operating under different repeated loads was proposed by normalizing the degrading rate of its spring constant. When 13,720 N, 11,760 N, and 9,800 N of repeated loads were applied to the rubber bush, final damage fraction was shown to be 63.7%, 50% and 40%, respectively. The normalizing lifetime (N/N_f) can be predicted as a function of damage fraction (D/D_f), regardless of the load amplitude, as follows: N/N_f = 0.043 + 0.376(D/D_f) + 0.489(D/D_f)².

• Periodical: Advanced Materials Research (Volume 739)
• Pages: 437-441
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.739.437
• Online since: August 2013
• Authors: Ho Kyung Kim
• Keywords: Damage Fraction, Fatigue, Oil-Damper Rubber Bush, Remaining Service Lifetime

References

[1] Korean railway vehicle manual, KORAIL (2001).

[2] KS M 6518: Physical test methods for vulcanized rubber (2006).

[3] L. Mullins L: Rubber Chem and Technol Vol. 42 (1948) p.339.