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

8th International Scientific Colloquium on Modelling for Materials Processing

Birjukovs, M.^1 ; Jakovics, A.^1 ; Holweger, W.^2

Department of Physics, University of Latvia, Zellu Street 23, Riga

LV-1002, Latvia^1

Tribology Fundamentals, Schaeffler Technologies GmbH and Co. KG, Industriestraße 1-3, Herzogenaurach

91074, Germany^2

关键词: Discharge currents;    Electrical current;    Initiation mechanism;    Material fatigue;    Microstructure configurations;    Model implementation;    Orders of magnitude;    Wind turbine gearboxes;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/355/1/012017/pdf
DOI  :  10.1088/1757-899X/355/1/012017

来源: IOP

【 摘 要 】

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.