Lifetime prediction of ceramic components – A case study on hybrid rolling contact.pdfVIP

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Lifetime prediction of ceramic components – A case study on hybrid rolling contact.pdf

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Lifetime prediction of ceramic components – A case study on hybrid rolling contact.pdf

Engineering Fracture Mechanics 169 (2017) 292–308 Contents lists available at ScienceDirect Engineering Fracture Mechanics journal homepage: /locate/engfracmech Lifetime prediction of ceramic components – A case study on hybrid rolling contact Iyas Khader a,b,?, Stefan Rasche c, Tanja Lube c, Rahul Raga b, Ulrich Degenhardt d, Andreas Kailer b a Department of Industrial Engineering, German-Jordanian University, P.O. Box 35247, Amman 11180, Jordan b Fraunhofer-Institute for Mechanics of Materials IWM, W?hlerstra?e 11, 79108 Freiburg, Germany c Instituts für Struktur- und Funktionskeramik der Montanuniversit?t Leoben, Peter-Tunner-Strasse 5, 8700 Leoben, Austria d FCT Ingenieurkeramik GmbH, Gewerbepark 11, 96528 Frankenblick, Germany article info Article history: Received 4 March 2016 Received in revised form 18 September 2016 Accepted 24 October 2016 Available online 4 November 2016 Keywords: Silicon nitride Rolling-contact fatigue Stress intensity factor Weight function method Lifetime prediction Negative load ratio abstract In this study, fatigue life predictions were made for silicon nitride components undergoing hybrid ceramic-steel rolling contact. Three-dimensional stress ?elds were extracted using a bespoke ?nite 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 ?uctuating tensile load (R = 0.1) and fully-reversed alternating load (R = à1). 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 ?uctuating te