Modelling of thermal stresses in bearing steel structure generated by electrical current impulses

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 with associated thermal stresses and material fatigue. Using data/results from previously published works,...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2018-05, Vol.355 (1), p.12017
Main Authors: Birjukovs, M, Jakovics, A, Holweger, W
Format: Article
Language:English
Subjects:
Bearing steels
Crack initiation
Current impulses
Fatigue limit
Gearboxes
Impulses
Mathematical models
Numerical models
Steel structures
Thermal stress
Thermodynamic properties
Wind turbines
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Summary: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 with 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 the previous numerical studies. Presented models show that the resulting stresses are several orders of magnitude below the fatigue limit/yield strength for the parameters used herein. Results and analysis of models provided by Scepanskis, 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.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/355/1/012017