Adrien Didier , Naim Naouar , Geoffray Deterre , Philippe Chaudet , Daniel Nelias
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引用次数: 0
Abstract
This paper uses ultrasonic testing devices to approach the rolling contact fatigue (RCF) stress state experienced during rolling on an indented surface, in order to understand the primary cause of failures of rolling element bearings in aeronautics. It relies on testing specimens made of M50-VIM/VAR steel while inducing compressive preload. This leads to a localized multi-axial and non-proportional stress field, induced by an artificial surface defect created via electro-discharge machining (EDM). Observations reveal that the surface crack initiation occurs along the EDM beyond cycles, with no shift observed from surface defects to sub-surface defects, as commonly seen in very high cycle fatigue (VHCF) regime. Our analysis suggests that the stress intensity factor range, , may govern surface initiation in the VHCF regime, particularly when the formation of fine granular area (FGA) is not feasible. Consequently, under fixed stress conditions, there exists a critical surface defect size below which short crack initiation becomes improbable. These results mirror the behavior usually observed for indentations and thereby connect ultrasonic loading with RCF. Besides, initiations of fatigue butterfly and FGA appear to be associated with VHCF tests, compression, high levels of multi-axial stresses, and the refinement of microstructure at low temperatures. These findings shed light on a potential link between fatigue butterfly and FGAs, attributed to the same underlying cause: cross-slip.
期刊介绍:
Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials.
Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).