Abstract
The objective of this work is to present a model of a High Pressure turbine blade, made of monocrystalline superalloy based on Nickel. Their leading edge can constitute privileged sites of damage and initiation of cracks which it is essential to take into account in the dimensioning of the blades of turbines. This work consisted, in a first time to make a theoretical study, the turbine blade is modeled like a beam of Timoshenko in rotation, a model of growth of damage for cycles of fatigue is developed using an approach of the mechanical damage continues. The latter is integrated with the dawn model. We made a numerical approach to study the effect of the growth of the damage on the rotating frequencies, and the effect of the number of cycles on the rigidity. Secondly, a numerical simulation of the crack propagation and the influence of vibrations on the blade is presented. Finally, an experiment on the initiation and micro-propagation of a crack is carried out. This made it possible to highlight the mechanical damage and the determination of the predictive lifespan of dawn.
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Lecheb, S., Chellil, A., Mechakra, H., Kebir, H. (2020). Influence of the Propagation of a Crack on the Modal Frequencies of the Turbine Blades. In: Benmounah, A., Abadlia, M.T., Saidi, M., Zerizer, A. (eds) Proceedings of the 4th International Symposium on Materials and Sustainable Development. ISMSD 2019. Springer, Cham. https://doi.org/10.1007/978-3-030-43268-3_15
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DOI: https://doi.org/10.1007/978-3-030-43268-3_15
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