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DEVELOPPEMENT D'UNE METHODE POUR QUALIFIER LA DEFORMATION D'UN PRODUIT ISSU D'UN TRAITEMENT THERMIQUE. APPROCHES EXPERIMENTALE ET NUMERIQUE

Abstract : Nowadays, heat treatment distortion is still difficult to control because of the lack in the corresponding mechanisms comprehension. Indeed, many technological and physical parameters are involved in the distortion formation and evolution, their coupled effects influencing the final results in a complex manner. In this context, the developed method defines a background suitable to study the influences of all parameters on a part distortion. This method is threefold. One point refers to the distortion significant components identification related to specific 3D part geometry: "distortion phenomena". They are quantified and their accuracy is evaluated using reliability indicators. The second point concerns the comparison of the experimental results with the numerical simulation ones. The numerical simulation prediction of the distortion is investigated by comparing the magnitudes of the distortion significant components. The third point is focused on the distortion mechanisms comprehension. The thermal, metallurgical and mechanical effects on each "distortion phenomenon" magnitude are examined in order to dissociate their influences on the final distortion results. Applied to the C-ring specimen, the developed method allows us to analyze the influence of two parameters on distortion: steel grade and quenching media. Two categories of "distortion phenomena" were detached: homogeneous dimensional variation due to the thermomechanical effects and heterogeneous dimensional variation due to the metallurgical and mechanical effects. Furthermore, the method was adapted to the analysis of numerical simulation results. Thus, distortion numerical simulation results were compared to the experimental ones. A good prediction is obtained for the distortion significant components, even for the local ones. Investigating the numerical simulation results allowed us to understand the distortion mechanisms and to highlight the strong sensibility of some "distortion phenomena" to the experimental parameters variation, used as initial data for simulation.
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https://pastel.archives-ouvertes.fr/tel-00440767
Contributor : Cyril Nicolas <>
Submitted on : Friday, December 11, 2009 - 2:50:25 PM
Last modification on : Friday, July 17, 2020 - 2:55:55 PM
Long-term archiving on: : Thursday, June 17, 2010 - 8:21:00 PM

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  • HAL Id : tel-00440767, version 1

Citation

Cyril Nicolas. DEVELOPPEMENT D'UNE METHODE POUR QUALIFIER LA DEFORMATION D'UN PRODUIT ISSU D'UN TRAITEMENT THERMIQUE. APPROCHES EXPERIMENTALE ET NUMERIQUE. Mécanique [physics.med-ph]. Arts et Métiers ParisTech, 2009. Français. ⟨NNT : 2009ENAM0019⟩. ⟨tel-00440767⟩

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