Documents disponibles écrits par cet auteur

An efficient 3D model of heterogeneous materials for elastic contact applications using multigrid methods / Hugo Boffy in Transactions of the ASME . Journal of tribology, Vol. 134 N° 2 (Avril 2012) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 134 N° 2 (Avril 2012) . - 08 p. Titre : An efficient 3D model of heterogeneous materials for elastic contact applications using multigrid methods Type de document : texte imprimé Auteurs : Hugo Boffy, Auteur ; Marie-Christine Baietto, Auteur ; Philippe Sainsot, Auteur Année de publication : 2012 Article en page(s) : 08 p. Note générale : tribology Langues : Anglais (eng) Mots-clés : 3D  graded  coating/substrate  model;  homogeneous  material;  graded  material;  three-dimensional  examples Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A 3D graded coating/substrate model based on multigrid techniques within a finite difference frame work is presented. Localized refinement is implemented to optimize memory requirement and computing time. Validation of the solver is performed through a comparison with analytical results for (i) a homogeneous material and (ii) a graded material. The algorithm performance is analyzed through a parametric study describing the influence of layer thickness (0.01 < t/a < 10) and mechanical properties (0.005 < Ec/Es < 10) of the coating on the contact parameters (Ph, a). Three-dimensional examples are then presented to illustrate the efficiency and the large range of possibilities of the model. The influence of different gradations of Young's modulus, constant, linear and sinusoidal, through the coating thickness on the maximum tensile stress is analyzed, showing that the sinusoidal gradation best accommodates the property mismatch of two successive layers. A final case is designed to show that full 3D spatial property variations can be accounted for. Two spherical inclusions of different size made from elastic solids with Young's modulus and Poisson's ratio are embedded within an elastically mismatched finite domain and the stress field is computed. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE9000134000002 [...] [article] An efficient 3D model of heterogeneous materials for elastic contact applications using multigrid methods [texte imprimé] / Hugo Boffy, Auteur ; Marie-Christine Baietto, Auteur ; Philippe Sainsot, Auteur . - 2012 . - 08 p. tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 134 N° 2 (Avril 2012) . - 08 p. Mots-clés : 3D  graded  coating/substrate  model;  homogeneous  material;  graded  material;  three-dimensional  examples Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A 3D graded coating/substrate model based on multigrid techniques within a finite difference frame work is presented. Localized refinement is implemented to optimize memory requirement and computing time. Validation of the solver is performed through a comparison with analytical results for (i) a homogeneous material and (ii) a graded material. The algorithm performance is analyzed through a parametric study describing the influence of layer thickness (0.01 < t/a < 10) and mechanical properties (0.005 < Ec/Es < 10) of the coating on the contact parameters (Ph, a). Three-dimensional examples are then presented to illustrate the efficiency and the large range of possibilities of the model. The influence of different gradations of Young's modulus, constant, linear and sinusoidal, through the coating thickness on the maximum tensile stress is analyzed, showing that the sinusoidal gradation best accommodates the property mismatch of two successive layers. A final case is designed to show that full 3D spatial property variations can be accounted for. Two spherical inclusions of different size made from elastic solids with Young's modulus and Poisson's ratio are embedded within an elastically mismatched finite domain and the stress field is computed. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE9000134000002 [...]

Contact analyses for anisotropic half space / Caroline Bagault in Transactions of the ASME . Journal of tribology, Vol. 134 N° 3 (Juillet 2012) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 134 N° 3 (Juillet 2012) . - 08 p. Titre : Contact analyses for anisotropic half space : effect of the anisotropy on the pressure distribution and contact area Type de document : texte imprimé Auteurs : Caroline Bagault, Auteur ; Daniel Nélias, Auteur ; Marie-Christine Baietto, Auteur Année de publication : 2012 Article en page(s) : 08 p. Note générale : tribology Langues : Anglais (eng) Mots-clés : anisotropic  materials;  semi-analytical  methods;  symmetry  axes; Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A contact model using semi-analytical methods, relying on elementary analytical solutions, has been developed. It is based on numerical techniques adapted to contact mechanics, with strong potential for inelastic, inhomogeneous or anisotropic materials. Recent developments aim to quantify displacements and stresses of an anisotropic material contacting both an isotropic or anisotropic material. The influence of symmetry axes on the contact solution will be more specifically analyzed. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://www.asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013400 [...] [article] Contact analyses for anisotropic half space : effect of the anisotropy on the pressure distribution and contact area [texte imprimé] / Caroline Bagault, Auteur ; Daniel Nélias, Auteur ; Marie-Christine Baietto, Auteur . - 2012 . - 08 p. tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 134 N° 3 (Juillet 2012) . - 08 p. Mots-clés : anisotropic  materials;  semi-analytical  methods;  symmetry  axes; Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A contact model using semi-analytical methods, relying on elementary analytical solutions, has been developed. It is based on numerical techniques adapted to contact mechanics, with strong potential for inelastic, inhomogeneous or anisotropic materials. Recent developments aim to quantify displacements and stresses of an anisotropic material contacting both an isotropic or anisotropic material. The influence of symmetry axes on the contact solution will be more specifically analyzed. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://www.asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013400 [...]