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Lifetime prediction of ceramic components - a case study on hybrid rolling contact

: Khader, I.; Rasche, S.; Lube, T.; Raga, R.; Degenhardt, U.; Kailer, A.

Postprint urn:nbn:de:0011-n-4620851 (1.8 MByte PDF)
MD5 Fingerprint: 3ce6c3f466a8e4cf6c073bfc540674be
Erstellt am: 09.11.2018

Engineering fracture mechanics 169 (2017), S.292-308
ISSN: 0013-7944
European Commission EC
FP7-NMP; 263476; ROLICER
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IWM ()
silicon nitride; rolling-contact fatigue; stress intensity factor; weight function method; lifetime prediction; negative load ratio

In this study, fatigue life predictions were made for silicon nitride components undergoing hybrid ceramic-steel rolling contact. Three-dimensional stress fields were extracted using a bespoke finite element model and subsequently used to calculate stress intensity factors by means of the weight function method. Crack-growth rates were estimated by assuming crack growth to follow a Paris power-law expression whose material parameters were obtained from four-point bending fatigue experiments under fluctuating tensile load (R = 0.1) and fully-reversed alternating load (R = −1). The crack-growth behavior obtained from the calculations was compared with experimental results obtained from twin-disk-type RCF experiments. The calculated lifetime predictions were in accordance with the experimental results. Crack formation and propagation was found more likely to occur in locations undergoing alternating load rather than those undergoing pure fluctuating tensile load.