Critical plane analysis of multiaxial fatigue experiments leading to White Etching Crack formation

6th International Conference on Fracture Fatigue and Wear

Averbeck, S.^1 ; Kerscher, E.^1

Materials Testing, University of Kaiserslautern, Gottlieb-Daimler-Strasse, Kaiserslautern

67663, Germany^1

关键词: Cyclic compression;    Microstructural changes;    Multi-axial fatigue;    Multiaxial stress state;    Premature failures;    Rolling contact fatigue;    Rolling Element Bearing;    Torsion experiments;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/843/1/012028/pdf
DOI  :  10.1088/1742-6596/843/1/012028

来源: IOP

【 摘 要 】

Various researchers have shown that rolling contact fatigue can be reproduced with cyclic compression-torsion experiments, with the load components either in-phase or out of phase. As reported previously, the authors used such experiments to reproduce the rolling contact fatigue phenomenon "White Etching Cracks" which can cause premature failures of rolling element bearings. It is characterized by subsurface crack initiation and propagation coupled with microstructural changes alongside the crack flanks. Surprisingly, only in-phase load superposition caused these microstructural changes to occur. This suggests that White Etching Crack formation is somehow linked to the multiaxial stress state in the specimens, as this was the only variable that changed between in-phase and out-of-phase testing. In this study, the multiaxial stress state in the two experiments is analysed and compared using different critical plane criteria. In contrast to common ways of characterizing the stress state, e.g. equivalent stress approaches, this class of criteria is explicitly designed for multiaxial stress states. Special attention is given to the Dang Van criterion, which has been used in a number of rolling contact fatigue studies.