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Propagation de fissure sous chargement thermomécanique cyclique anisotherme

Abstract : The goal of the work is to find a new crack growth law under complex multi-axial thermo-mechanical transient loading. The first step was to perform finite element simulation on a cylinder head 3D model to first verify the localization of the structure's critical zone at the nose bridge between the inlet and the exhaust valve and second to determine the stress and temperature fields variation with time in that zone. As a second step, long crack fatigue tests were conducted on CT16 and SEN specimens at different load ratios, temperatures, frequencies and stress intensity factor values in order to establish the contribution of each parameter in governing the fatigue crack propagation. SEM, optical microscopy and other metallographic techniques were used to examine fracture surfaces and to analyze particles cracking. Using the experimental and numerical results, a new "damage tolerant" model design based on a non-isothermal crack growth prediction law was proposed validated and implemented.
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https://pastel.archives-ouvertes.fr/pastel-00658854
Contributor : Elias Merhy <>
Submitted on : Wednesday, January 11, 2012 - 2:37:22 PM
Last modification on : Thursday, September 24, 2020 - 4:00:22 PM
Long-term archiving on: : Tuesday, December 13, 2016 - 9:58:23 PM

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  • HAL Id : pastel-00658854, version 1

Citation

Elias Merhy. Propagation de fissure sous chargement thermomécanique cyclique anisotherme. Mécanique des matériaux [physics.class-ph]. Ecole Polytechnique X, 2011. Français. ⟨pastel-00658854⟩

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