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Mode III threshold under Rolling Contact Fatigue and development of a test gearbox for planet gears

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Mode III Rißausbreitung: Entwicklung eines Testgetriebes für Planetenräder


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This paper is on the assessment for Mode III crack propagation under the influence of primarily Rolling Contact Fatigue (RCF) in integrated thin-rimmed planetary gears and its integrated bearings, and the design and development of a test gearbox for the full-scale testing of such a 3-gear train planet gears layout. It is in response to the ‘Innovative DEsign for Reliable PLANEt bearings’ (IDERPLANE) research project which will address the concern of high RCF in planetary gear bearings in the epicyclic modules of aerospace applications such as Geared turbofans (GTFs) and Main gearboxes (MGBs) in aircrafts. The project is part of the Clean Sky 2 Horizon 2020 call, and its consortium is headed by the Politecnico di Milano.


Dieser Beitrag konzentriert sich auf die Bewertung der Mode-III-Rißausbreitung unter dem Einfluss von Kontaktermüdung (RCF) in integrierten dünnrandigen Planetenradlagern und die Konstruktion und Entwicklung eines Testgetriebes. Die Ergebnisse wurden im Rahmen des Forschungsprojekts „Innovative DEsign for Reliable PLANEt bearings’“ (IDERPLANE) gewonnen. Das Projekt konzentriert sich auf das Versagen von integrierten Planetenradlagern in den Umlaufmodulen von Luft- und Raumfahrtanwendungen wie Getriebefans (GTFs) und Hauptgetrieben (MGB) von Flugzeugen. Das Projekt ist Teil des Clean Sky 2 Horizon 2020 Calls, dessen Konsortium vom Politecnico di Milano geleitet wird.

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This project has received funding from the Clean Sky 2 Joint Undertaking under the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 821315.

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Correspondence to Prasad Mahendra Rao.

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Rao, P.M., Foletti, S., Bonaiti, L. et al. Mode III threshold under Rolling Contact Fatigue and development of a test gearbox for planet gears. Forsch Ingenieurwes 86, 483–490 (2022).

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