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Multiscale Phenomena in Plasticity: From Experiments to Phenomenology, Modelling and Materials Engineering
A profusion of research and results on the mechanical behaviour of crystalline solids has followed the discovery of dislocations in the early thirties. This trend has been enhanced by the development of powerful experimental techniques. particularly X ray diffraction. transmission and scanning electron microscopy. microanalysis. The technological advancement has given rise to the study of various and complex materials. not to speak of those recently invented. whose mechanical properties need to be mastered. either for their lise as structural materials. or more simply for detenllining their fonnability processes. As is often the case this fast growth has been diverted both by the burial of e...
Interfaces and Plasticity
Dislocations were introduced into crystal physics, and particularly into the theory of plasticity, in 1934. For many years, they were the field of speculation of a small group of specialists, not considered seriously by real physicists and metallurgists. After W.T. Read Jr's fundamental work in 1953 and further developments by Cottrel, Friedel, Frank and Hirsch, dislocations had become part of the working vocabulary of solid-state physics and metallurgy.
Computer Simulation in Materials Science
For decades to come, the limits to computing power will not allow atomistic simulations of macroscopic specimens. Simulations can only be performed on various scales (nano, meso, micro and macro) using the input provided by simulations (or data) on the next smaller scale. The resulting hierarchy has been the focus of many seminars and lectures. Necessarily, special emphasis has been placed on mesoscopic simulations, bridging the gaps between nano (atomic) and micro space and time scales. The contributors to Computer Simulation in Materials Science consider both fundamental problems and applications. Papers on the evolution of morphological patterns in phase transformations and plastic deform...
LA DEFORMATION EN SOLLICITATION CYCLIQUE DE MONOCRISTAUX DE CUIVRE
LES OBSERVATIONS DE LA DYNAMIQUE DES DISLOCATIONS ET DES MICROSTRUCTURES ONT PERMIS DE MESURER UN CERTAIN NOMBRE DE PARAMETRES INDISPENSABLES POUR L'ELABORATION DES MODELES RELIANT LE COMPORTEMENT MICROSCOPIQUE AU COMPORTEMENT MACROSCOPIQUE: CONTRAINTES LOCALES, PARAMETRE DE GLISSEMENT DEVIE, COUPLAGE DES DISLOCATIONS VIS, CONTRIBUTIONS RESPECTIVES DES DISLOCATIONS VIS ET COIN A LA DEFORMATION DES BANDES DE GLISSEMENT PERSISTANTES. EN FONCTION DE CES RESULTATS, ON PROPOSE UNE VERSION GENERALISEE DES MODELES DE SATURATION CYCLIQUE QUE L'ON COMPARE A L'EXPERIENCE. MISE EN EVIDENCE DU ROLE FONDAMENTAL JOUE AU NIVEAU MICROSCOPIQUE PAR LE GLISSEMENT DEVIE
Organisation des structures de dislocations
ETUDE PAR MICROSCOPIE ELECTRONIQUE DE LA DEFORMATION CYCLIQUE DES MONOCRISTAUX DE CUIVRE ET DES MONO- ET POLYCRISTAUX D'ACIER FERRITIQUE. MISE AU POINT D'UN MODELE TENANT COMPTE DES MECANISMES LOCAUX DE MULTIPLICATION ET D'ANNIHILATION DES DISLOCATIONS. SIMULATION DE L'ARRANGEMENT DYNAMIQUE DE LA STRUCTURE DES DISLOCATIONS. DESCRIPTION DE L'ORGANISATION DE LA MICROSTRUCTURE EN DEFORMATION MONOTONE ET CYCLIQUE, LA PROPAGATION DU GLISSEMENT ET DIVERS ASPECTS DE LA RELATION ENTRE COMPORTEMENTS MICROSCOPIQUES ET MACROSCOPIQUES DE LA PLASTICITE
