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Simulation de la propagation des fissures par fatigue dans les toiles des roues de train sous chargement à amplitude variable

Abstract : Industrial components, like train wheels, are often subjected to complex stresses, either because multiaxial and random load.
It's proposed to apply an incremental crack growth model to predict crack growth in train wheels subjected to service loading. We present the improvement of the model to take into account the compressive cycles, the T-stress, and the semi elliptical shape of the crack.
The principle of the incremental model is easy, the instantaneous crack extension is proportional to the plastic blunting at crack tip. The evolution equations of the crack tip blunting are computed by Finite Element knowing the elastic plastic behaviour of the cracked structure. Two tests are necessary to identify the model parameters, a cyclic behaviour test and a monotonic crack growth test. Crack growth simulations show that the model reproduce all phenomenon observed in variable amplitude fatigue: delay after overload, acceleration after compressive overload, interaction between fatigue cycle and the history of the loading. We integrated and validate T-stress and R ratio in the model with fatigue test specimens machined in a wheel. Finally, he model has been extended for the semi elliptical crack. Crack growth test with 4 points specimen and a scale 1 wheel where performed, we found a good agreement with the model prediction.
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https://tel.archives-ouvertes.fr/tel-00133413
Contributor : Ens Cachan Bibliothèque <>
Submitted on : Monday, February 26, 2007 - 11:50:28 AM
Last modification on : Tuesday, October 6, 2020 - 8:22:03 AM
Long-term archiving on: : Tuesday, April 6, 2010 - 9:19:18 PM

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  • HAL Id : tel-00133413, version 1

Citation

Rami Hamam. Simulation de la propagation des fissures par fatigue dans les toiles des roues de train sous chargement à amplitude variable. Mécanique [physics.med-ph]. École normale supérieure de Cachan - ENS Cachan, 2006. Français. ⟨tel-00133413⟩

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