Documents disponibles écrits par cet auteur

Use of quasi-static nanoindentation data to obtain stress–strain characteristics for metallic materials / J. Dean in Acta materialia, Vol. 58 N° 10 (Juin 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3613–3623 Titre : Use of quasi-static nanoindentation data to obtain stress–strain characteristics for metallic materials Type de document : texte imprimé Auteurs : J. Dean, Auteur ; J.M. Wheeler, Auteur ; T.W. Clyne, Auteur Année de publication : 2011 Article en page(s) : pp. 3613–3623 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Nanoindentation  Finite  element  analysis  Creep  Non-destructive  testing Résumé : This paper concerns optimization of procedures and algorithms for extraction of stress–strain relationships from quasi-static nanoindentation experiments, using finite element method modelling. Several issues are highlighted, including the usefulness of incorporating residual indent shape in the comparisons, as well as load–displacement–time data, and the significance of creep and interfacial friction. The study is focused on extruded copper bar, using a spherical indenter and assuming transverse isotropy throughout. It is shown that, using the methodology presented here, experimental nanoindentation data could be used to estimate the yield stress and work-hardening rate, with good accuracy, i.e. the yield stress could have been obtained to a precision of about ±10%, and the work-hardening rate to about ±25%. Such inferred constitutive relations are more likely to be reliable if the comparisons are made in regimes within which creep does not significantly influence the behaviour, and in general the timescale of measurement is important. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001308 [article] Use of quasi-static nanoindentation data to obtain stress–strain characteristics for metallic materials [texte imprimé] / J. Dean, Auteur ; J.M. Wheeler, Auteur ; T.W. Clyne, Auteur . - 2011 . - pp. 3613–3623. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3613–3623 Mots-clés : Nanoindentation  Finite  element  analysis  Creep  Non-destructive  testing Résumé : This paper concerns optimization of procedures and algorithms for extraction of stress–strain relationships from quasi-static nanoindentation experiments, using finite element method modelling. Several issues are highlighted, including the usefulness of incorporating residual indent shape in the comparisons, as well as load–displacement–time data, and the significance of creep and interfacial friction. The study is focused on extruded copper bar, using a spherical indenter and assuming transverse isotropy throughout. It is shown that, using the methodology presented here, experimental nanoindentation data could be used to estimate the yield stress and work-hardening rate, with good accuracy, i.e. the yield stress could have been obtained to a precision of about ±10%, and the work-hardening rate to about ±25%. Such inferred constitutive relations are more likely to be reliable if the comparisons are made in regimes within which creep does not significantly influence the behaviour, and in general the timescale of measurement is important. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001308