IDERPLANE Project Final Workshop

IDERPLANE Project Consortium

On 29th January, we will hold a webinar presenting the results of the IDERPLANE Clean Sky Project devoted to design of integrated bearing in

On 29th January, we will hold a webinar presenting the results of the IDERPLANE Clean Sky Project devoted to design of integrated bearing in planetary gears. The webinar will consist in presentations about project results for technical and scientific communities. IDERPLANE project in a nutshell The high power transmissions that have to be designed for modern highly efficient turbofans need the extensive application of epicyclical gears with planet gear containing an integrated bearing. These components are subjected to severe rolling contact fatigue (RCF) conditions as many others (e.g. wheels/rails of high speed trains): propagation of micro-cracks starting from the bearing race surface and leading to spalling is a typical damage mode of these components. The main idea behind IDERPLANE is to analyze the problem not in terms of the usual stress-based design of gears, but rather on damage tolerance concepts. This kind of analysis is meant at understanding/measuring the risk of a catastrophic failure in the case of development of subsurface propagation of cracks driven by shear stresses. Incidentally, it has to be emphasized that spalls can lead to sub-surface cracks only once they have reached a critical size. If this could be seen an established route, unfortunately RCF is a grey area where there are no data available for such an analysis (that should be based on reliable crack growth curves), because it is very difficult to make cracks propagate under shear as it happens in RCF (and as it was shown in the known failures of planet gear containing an integrated bearing).The IDERPLANE research project was funded under the Clean Sky 2 Horizon 2020 call under grant agreement n. 821315. The consortium is led by the Politecnico di Milano and involves the University of Brescia, the “Institut national des sciences appliqués de Lyon”, the team of the Free University of Bozen-Bolzano and Argo Srl.

AGENDA

IDERPLANE Project overview (S. Beretta, PoliMI);

- Tomographic observations of RCF tests (J.Y. Buffiere, INSA);

How to describe fatigue crack growth under RCF under bi-disk tests; (A. Mazzu,

New concepts for full-scale tests (P. M, Rao, C. Gorla, PoliMI)

Trasfer to component design (A. Piazza,AvioAero)

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IDERPLANE Project Final Workshop

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