Effective heat conductivities of partly infiltrated fibrous media
dc.contributor.author
hal.structure.identifier | VIGNOLES, Gérard
|
dc.contributor.author
hal.structure.identifier | COINDREAU, Olivia
|
dc.contributor.author
hal.structure.identifier | ROS, William
|
dc.contributor.author | COULARD DIAS, Fagner |
dc.contributor.author
hal.structure.identifier | AHMADI-SENICHAULT, Azita
|
dc.date.accessioned | 2015 |
dc.date.available | 2015 |
dc.date.issued | 2009 |
dc.date.submitted | 2015 |
dc.identifier.uri | http://hdl.handle.net/10985/9984 |
dc.description.abstract | The present work has been motivated by the context of feeding a global model of thermal-gradient chemical vapour infiltration process for the fabrication of fibre-reinforced ceramic matrix composites: the heat conductivity has to be known in the material as a function of the pore volume distribution, at different stages of infiltration. Since the composite preform is made of woven fibres, the medium is highly anisotropic: the heat conductivity has a tensorial character which has to be retrieved. We propose an approach based on a double up-scaling. First, the fibre-scale effective longitudinal and transverse conductivities are computed for several volume fractions of matrix and fibres, using a periodic unit cell as a computational domain. The second change of scale takes precisely into account the actual architecture of the composite thanks to 3D X-ray tomographic imaging. The 3D blocks are processed in order to retrieve the local orientation of the fibres in various sub-domains; the local heat conductivities are then affected to the sub-domains, and a volume averaging procedure is applied for the determination of the global effective conductivity. Several application examples are presented and discussed. |
dc.language.iso | en |
dc.rights | Pre-print |
dc.subject | Heat conductivity |
dc.subject | Fibrous media |
dc.subject | Upscaling |
dc.title | Effective heat conductivities of partly infiltrated fibrous media |
dc.typdoc | Communication sans acte |
dc.localisation | Centre de Bordeaux-Talence |
dc.subject.hal | Sciences de l'ingénieur: Mécanique: Mécanique des fluides |
ensam.conference.title | International Conf. on Challenges of Porous Media |
ensam.conference.date | 2009-03-11 |
ensam.country | Allemagne |
ensam.city | Kaiserslautern |
hal.description.error | {"meta":{"proceedings":{"isEmpty":"Vous devez remplir ce champ"},"peerReviewing":{"isEmpty":"Vous devez remplir ce champ"},"audience":{"isEmpty":"Vous devez remplir ce champ"}}} |
hal.identifier | hal-01196744 |
hal.version | 1 |
hal.submission.permitted | updateMetadata |
hal.status | accept |