About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
Presentation Title |
Moving Cracks Form White Etching Areas During Rolling Contact Fatigue in Bearings |
Author(s) |
Lutz Morsdorf, David Mayweg, Yujiao Li, Annika Diederichs, Dierk Raabe, Michael Herbig |
On-Site Speaker (Planned) |
Michael Herbig |
Abstract Scope |
White etching areas (WEAs) and the associated white etching cracks (WECs) are responsible for failure of widely spread engineering applications such as bearings and railways. We propose a mechanism where WECs move, i.e. continuously change their position in the material, leaving behind a severely plastically deformed area - the WEAs. Cracks have so far only been reported to propagate, i.e. to continuously extend, not to move normal to their plane through the material. Our results suggest that cracks initiate at inclusions below the surface. During compressive loading cycles fracture surface rubbing occurs. This leads to the formation of WEA by local severe plastic deformation. It also leads to partial cohesion and material transport between the abutting fracture surfaces. The WEC opens during unloading at a slightly shifted position with respect to its former one. Repetitive loading/unloading cycles lead to a macroscopic change of the crack position. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |