Original scientific paper

COMPARISON OF STRUCTURAL DESIGN IN HIGH AND ULTRA-HIGH CYCLE FATIGUE REGIONS

Lukáš Faturík ; Department of Design and Mechanical Elements, Faculty of Mechanical Engineering, University of Žilina, Žilina, Slovak Republic
Libor Trško ; Research Centre of University of Žilina, Žilina, Slovak Republic
Slavomír Hrček ; Department of Design and Mechanical Elements, Faculty of Mechanical Engineering, University of Žilina, Žilina, Slovak Republic
Otakar Bokůvka ; Department of Materials Engineering, Faculty of Mechanical Engineering,, Žilina, Slovak Republic

Abstract

Ultra-high cycle fatigue of structural materials has been an extensively investigated phenomenon in the last thirty years. Nevertheless, the fact that there is no infinite fatigue life of metallic materials has not been considered in structural design very often. This paper presents the results of 50CrMo4 low alloy steel fatigue tests in the high and the ultra-high cycle region showing a considerable difference in the fatigue strength for N = 10^7 and N = 10^9 loading cycles. A comparison of shaft mechanical design for different required fatigue lifetimes is provided showing a necessity of designs changes to achieve safe operation in the ultra-high cycle region, thus leading to a 10 % increase in the weight of the shaft.

Keywords

50CrMo4 steel; ultra-high cycle fatigue; high frequency fatigue testing; mechanical design; shaft

Hrčak ID:

135872

URI

https://hrcak.srce.hr/135872

Publication date:

4.3.2015.

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