Interface controlled plastic flow modelled by strain gradient plasticity theory

Thomas Pardoen; Thierry J. Massart

doi:10.1016/j.crme.2012.02.008

Interface controlled plastic flow modelled by strain gradient plasticity theory

Thomas Pardoen ¹ ; Thierry J. Massart ²

¹ Institute of Mechanics, Materials and Civil Engineering, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
² Université Libre de Bruxelles (ULB), Building, Architecture & Town Planning Dept. (BATir), CP 194/02, Avenue F.D. Roosevelt 50, B-1050 Bruxelles, Belgium

Comptes Rendus. Mécanique, Recent Advances in Micromechanics of Materials, Volume 340 (2012) no. 4-5, pp. 247-260.

Abstract

The resistance to plastic flow in metals is often dominated by the presence of interfaces which interfere with dislocation nucleation and 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 and strain hardening capacity of many metallic systems especially in very fine microstructures with a high density of interfaces. A phenomenological strain gradient plasticity theory is used to introduce, within a continuum framework, higher order boundary conditions which empirically represent the effect of interfaces on plastic flow. The strength of the interfaces can evolve during the loading in order to enrich the description of their response. The behaviour of single and dual phase steels, with possible TRIP effect, accounting for the interactions with static and dynamic boundaries, is addressed, with a specific focus on the size dependent strength and ductility balance. The size dependent response of weak precipitate free zones surrounding grain boundaries is treated as an example involving more than one microstructural length scale.

Published online: 2012-03-29

DOI: 10.1016/j.crme.2012.02.008

Keywords: Constitutive models, Strength, Ductility, Strain gradient plasticity, Size effects, Interfaces

Author's affiliations:

Thomas Pardoen ¹; Thierry J. Massart ²

¹ Institute of Mechanics, Materials and Civil Engineering, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
² Université Libre de Bruxelles (ULB), Building, Architecture & Town Planning Dept. (BATir), CP 194/02, Avenue F.D. Roosevelt 50, B-1050 Bruxelles, Belgium

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Thomas Pardoen; Thierry J. Massart. Interface controlled plastic flow modelled by strain gradient plasticity theory. Comptes Rendus. Mécanique, Recent Advances in Micromechanics of Materials, Volume 340 (2012) no. 4-5, pp. 247-260. doi : 10.1016/j.crme.2012.02.008. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2012.02.008/

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