Discrete dislocation dynamics analysis of the effect of lattice orientation on void growth in single crystals

Segurado Escudero, Javier and Llorca Martinez, Francisco Javier (2010). Discrete dislocation dynamics analysis of the effect of lattice orientation on void growth in single crystals. "International Journal of Plasticity", v. 26 (n. 6); pp. 806-819. ISSN 0749-6419. https://doi.org/10.1016/j.ijplas.2009.10.009.

Description

Title: Discrete dislocation dynamics analysis of the effect of lattice orientation on void growth in single crystals
Author/s:
  • Segurado Escudero, Javier
  • Llorca Martinez, Francisco Javier
Item Type: Article
Título de Revista/Publicación: International Journal of Plasticity
Date: June 2010
ISSN: 0749-6419
Volume: 26
Subjects:
Freetext Keywords: Dislocations; Numerical simulations; Plastic deformation; Single crystals
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

The micromechanisms of plastic deformation and void growth were analyzed using discrete dislocation dynamics in an isolated FCC single crystal deformed in-plane strain in the plane. Three different stress states (uniaxial tension, uniaxial deformation and biaxial deformation) were considered for crystals oriented in different directions and with a different number of active slip systems. It was found that strain hardening and void growth rates depended on lattice orientation in uniaxial tension because of anisotropic stress state. Crystal orientation did not influence, however, hardening and void growth when the crystals were loaded under uniaxial or biaxial deformation because the stress state was more homogeneous, although both (hardening and void growth rates) were much higher than under uniaxial tension. In addition, the number of active slip systems did not substantially modify the mechanical behavior and the void growth rate if plastic deformation along the available slip systems was compatible with overall crystal deformation prescribed by the boundary conditions. Otherwise, the incompatibility between plastic deformation and boundary conditions led to the development of large hydrostatic elastic stresses, which increased the strain hardening rate and reduced the void growth rate.

More information

Item ID: 8490
DC Identifier: http://oa.upm.es/8490/
OAI Identifier: oai:oa.upm.es:8490
DOI: 10.1016/j.ijplas.2009.10.009
Official URL: http://www.sciencedirect.com/science/article/pii/S074964190900148X
Deposited by: Memoria Investigacion
Deposited on: 18 Aug 2011 07:54
Last Modified: 30 Nov 2015 08:25
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