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. In: "XII International Conference on Computational Plasticity. Fundamentals and Applications (COMPLAS XII)", 03/09/2013-05/09/2013, Barcelona (España).

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: Presentation at Congress or Conference (Article)
Event Title: XII International Conference on Computational Plasticity. Fundamentals and Applications (COMPLAS XII)
Event Dates: 03/09/2013-05/09/2013
Event Location: Barcelona (España)
Title of Book: Proceedings of the 12th International Conference on Computational Plasticity. Fundamentals and Applications, COMPLAS XII, Barcelona, Spain, September 3-5, 2013
Date: 2013
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: 30143
DC Identifier: http://oa.upm.es/30143/
OAI Identifier: oai:oa.upm.es:30143
Official URL: http://congress.cimne.com/complas2013/frontal/default.asp
Deposited by: Memoria Investigacion
Deposited on: 02 Jul 2014 11:55
Last Modified: 22 Apr 2016 00:26
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