Latent hardening size effect in small-scale plasticity

Bardella, Lorenzo and Segurado Escudero, Javier and Panteghini, Andrea and Llorca Martinez, Francisco Javier (2013). Latent hardening size effect in small-scale plasticity. "Modelling and simulation in materials science and engineering", v. 21 (n. 5); pp. 1-28. ISSN 0965-0393. https://doi.org/10.1088/0965-0393/21/5/055009.

Description

Title: Latent hardening size effect in small-scale plasticity
Author/s:
  • Bardella, Lorenzo
  • Segurado Escudero, Javier
  • Panteghini, Andrea
  • Llorca Martinez, Francisco Javier
Item Type: Article
Título de Revista/Publicación: Modelling and simulation in materials science and engineering
Date: July 2013
ISSN: 0965-0393
Volume: 21
Subjects:
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ciencia de los Materiales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

We aim at understanding the multislip behaviour of metals subject to irreversible deformations at small-scales. By focusing on the simple shear of a constrained single-crystal strip, we show that discrete Dislocation Dynamics (DD) simulations predict a strong latent hardening size effect, with smaller being stronger in the range [1.5 µm, 6 µm] for the strip height. We attempt to represent the DD pseudo-experimental results by developing a flow theory of Strain Gradient Crystal Plasticity (SGCP), involving both energetic and dissipative higher-order terms and, as a main novelty, a strain gradient extension of the conventional latent hardening. In order to discuss the capability of the SGCP theory proposed, we implement it into a Finite Element (FE) code and set its material parameters on the basis of the DD results. The SGCP FE code is specifically developed for the boundary value problem under study so that we can implement a fully implicit (Backward Euler) consistent algorithm. Special emphasis is placed on the discussion of the role of the material length scales involved in the SGCP model, from both the mechanical and numerical points of view.

More information

Item ID: 29078
DC Identifier: http://oa.upm.es/29078/
OAI Identifier: oai:oa.upm.es:29078
DOI: 10.1088/0965-0393/21/5/055009
Official URL: http://iopscience.iop.org/0965-0393/21/5/055009/
Deposited by: Memoria Investigacion
Deposited on: 02 Jul 2014 11:10
Last Modified: 22 Sep 2014 11:44
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