eprintid: 8490 rev_number: 17 eprint_status: archive userid: 1903 dir: disk0/00/00/84/90 datestamp: 2011-08-18 07:54:21 lastmod: 2015-11-30 08:25:09 status_changed: 2011-08-18 07:54:21 type: article metadata_visibility: show item_issues_count: 0 creators_name: Segurado Escudero, Javier creators_name: Llorca Martinez, Francisco Javier title: Discrete dislocation dynamics analysis of the effect of lattice orientation on void growth in single crystals publisher: Elsevier rights: by-nc-nd ispublished: pub subjects: materiales full_text_status: public keywords: Dislocations; Numerical simulations; Plastic deformation; Single crystals 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. date_type: published date: 2010-06 publication: International Journal of Plasticity volume: 26 number: 6 pagerange: 806-819 id_number: 10.1016/j.ijplas.2009.10.009 institution: Caminos department: Ciencia_Materiales refereed: TRUE issn: 0749-6419 official_url: http://www.sciencedirect.com/science/article/pii/S074964190900148X citation: 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 . document_url: http://oa.upm.es/8490/2/INVE_MEM_2010_83394.pdf