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• W1569694678 abstract "In order to better understand how an indent-induced plastic zone forms, the experimental conditions associated with nanoindentation testing on f.c.c. crystals are modeled, using a combination of three- dimensional discrete dislocation simulation and the finite element method (FEM). At each stage of the loading, the FEM elastic solution enforcing the boundary conditions is superimposed to the infinite medium elastic solution of the discrete dislocations. The plastic character of the indented material is accounted for by relaxing the elastic loading stresses through both the introduction of new nucleated discrete dislocations (loops) and their motion within the sample. Transmission Electron Microscopy observations of the indent-induced plastic volume and analysis of the experimental loading curve help in defining a complete set of nucleation rules. A validation of the model is performed through direct comparisons between a simulation of a nanoindentation test on a [001] copper single crystal and the same experimental indentation. Afin de comprendre les mécanismes à l'origine de la plastification localisée sous la pointe d'un indenteur, nous avons modélisé l'essai de nanoindentation de monocristaux c.f.c. en utilisant un code 3D décrivant la dynamique des dislocations, couplé à un logiciel éléments finis. A chaque itération, la solution élastique rendant compte des conditions aux limites est déterminée par les éléments finis et superposée à celle des dislocations supposées dans un milieu infini. Le caractère plastique de la déformation est pris en compte en relâchant les champs de contraintes imposés, grâce à l'introduction de nouveaux segments de dislocations (boucles) et leurs mouvements dans le volume simulé. Des observations de l'indentation en microscopie électronique en transmission permettent d'identifier la configuration des dislocations introduites. L'analyse de la courbe de charge donne la valeur correspondante du chargement. Le modèle est validé en comparant les résultats simulés et expérimentaux d'une indentation d'un monocristal de cuivre suivant [001]." @default.
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• W1569694678 date "1998-11-01" @default.
• W1569694678 modified "2023-09-25" @default.
• W1569694678 title "Three-dimensional modeling of indent-induced plastic zone at a mesoscale1This paper is dedicated to Gilles Canova whose untimely death occurred on 28 July 1997 at the age of 43.1" @default.
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• W1569694678 doi "https://doi.org/10.1016/s1359-6454(98)00278-x" @default.
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