VTPMML
UNIVERSITY OF LATVIA
Laboratory for Mathematical Modelling
of Environmental and Technological Processes

M. Birjukovs, A. Jakovičs, W. Holweger

Modelling of Thermal Stresses in Bearing Steel Structure Generated by Electrical Current Impulses


Abstract

This work is the study of one particular candidate for white etching crack (WEC) initiation mechanism in wind turbine gearbox bearings: discharge current impulses flowing through bearing steel and associated thermal stresses and material fatigue. Using data/results from previously published works, the authors develop a series of models that are utilized to simulate these processes under various conditions/local microstructure configurations, as well as to verify the results of previous numerical studies. Presented models show that for the parameters used herein, the resulting stresses are several orders of magnitude below the fatigue limit. Results and analysis of models provided by Ščepanskis, M. et al. also indicate that certain effects predicted in their previous work resulted from a physically unfounded assumption about material thermodynamic properties and numerical model implementation issues.

Full paper



Proceedings of the VIII International Scientific Colloquim "Modelling for Materials Processing", Riga, Latvia, (2017), pp. 201-208.

https://doi.org/10.22364/mmp2017.29