par Pardoen, Thomas;Brugger, C.;Massart, Thierry,Jacques
Référence International Conference on Computational Plasticity - COMPLAS(XII: September 2013: Barcelona, Spain), Proceedings of the International Conference on Computational Plasticity - COMPLAS
Publication Publié, 2013-09-01
Abstract de conférence
Résumé : The resistance to plastic flow in metals is often dominated by the presence of interfaces which interfere with dislocation motion. Interfaces can be static such as grain and phase boundaries or dynamic such as new boundaries resulting from a phase transformation. The interface can be hard and fully impenetrable to dislocations, or soft and partly or fully transparent. The interactions between dislocations and interfaces constitute the main mechanism controlling the strength of many metallic systems especially in very fine microstructures. A phenomenological strain gradient plasticity theory is used to introduce higher order boundary conditions which represent the effect of interfaces on plastic flow. The strength of the interfaces can evolve during the loading. The size dependent behaviour of single phase steels and of thin metallic films has been addressed, with a focus on the resistance to plastic localization by necking, and comparisons are made with experimental data used for the identification and validation of the model.