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Local damages during rolling and mechano-rolling fatigue for the mechanical system shaft : roller (0.45 carbon steel – 25XGT steel, 20XH3A steel – 20XH3A steel)

Bogdanovich A., Yelovoy O., Sosnovskiy L., Komissarov V., Tyurin S.

Acta Mechanica et Automatica

2015

Vol. 9, no. 4

259--264

The report provides a description of local damages which are formed in the process of wear-fatigue tests. The analysis of local surface wave-like damages during rolling and mechano-rolling fatigue for the shaft-roller mechanical system under steady-state and multistage loading conditions is given. It is shown that the study of local wear-fatigue damage was made possible by new methods of testing and measuring wear-fatigue tests and damages, which are described in the report. New characteristics to estimate the parameters of the local wear-fatigue damage are proposed. The concept of local fatigue curves is introduced. The laws of local wear-fatigue damage for the shaft - roller system are analysed.

Regression of fatigue curves using functions with graphs close to broken line

Kohout J., Věchet S.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

1999

z. 59

99-102

Two new regression functions for the regression of fatigue curves were presented in paper [1] - the former for high cycle range, the latter for the whole cycle range starting with tensile strength and finishing high cycle range. The former has two asymptotes in log-log fit - with negative slope in the range of low cycle fatigue and with zero slope in high cycle range. The curve corresponding to the former function goes very close to both asymptotes, only in the range of their intersection it deflects considerably. Thus this curve is very similar to classical fit of fatigue results - broken straight line. Deeper study of Bastenaire function [2] has shown that it presents the same behaviour in log-lin fit. In usual range of high cycle fatigue, i.e. between 10 4 and 10 8 cycles the graphs of both these functions differ less than by usual thickness of line.