Impact des caractéristiques microstructurales des pièces forgées sur leur tenue en fatigue à grand nombre de cycles : modélisation multi-échelles et validation expérimentale

Abstract : During a forging process, components undergo complex large strains. As a consequence, the microscopic is not homogeneous and the macroscopic behavior of the final component is not isotropic; it varies with different loading conditions and directions. The goal of this study is to take into account this anisotropy in high cycle fatigue simulations on industrial components on the basis of forging output. Standard high cycle fatigue criteria predict efficiently the resistance of isotropic components but are not suitable for anisotropic components. The aim is to represent explicitly this anisotropy at a lower scale compared to the process scale and well identified local coefficients needed to simulate a real case. Thus, from stochastic experimental data, a very realistic microstructure can be reconstructed in order to perform high cycle fatigue simulations for different orientations. By this means, the local mechanical anisotropy is included and local parameters, which are needed to optimize back the forging process, can be determined. The link between these data and the process scale is, as a first approximation, the fiber vector and the kneading coefficient, which can later be used to calculate global mechanical anisotropy. The results can be integrated in global optimization loops to determine, for instance, the relevant preform of the component.
Complete list of metadatas

Cited literature [130 references]  Display  Hide  Download

https://pastel.archives-ouvertes.fr/tel-00408851
Contributor : Magalie Prudon <>
Submitted on : Thursday, October 29, 2009 - 10:40:13 AM
Last modification on : Monday, November 12, 2018 - 10:53:50 AM
Long-term archiving on: Thursday, June 17, 2010 - 6:37:52 PM

Identifiers

  • HAL Id : tel-00408851, version 1

Citation

Marc Milesi. Impact des caractéristiques microstructurales des pièces forgées sur leur tenue en fatigue à grand nombre de cycles : modélisation multi-échelles et validation expérimentale. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2009. Français. ⟨NNT : 2009ENMP1628⟩. ⟨tel-00408851⟩

Share

Metrics

Record views

749

Files downloads

1124