Modeling microstructural effects in dilatational plasticity of polycrystalline materials

In a recent paper [1] we presented a new constitutive model for the viscoplastic response of polycrystalline aggregates accounting for local anisotropy induced by crystal plasticity and dilatational effects associated with the presence of intergranular cavities. In this contribution we provide a sum...

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Detalles Bibliográficos
Autores principales:	Lebensohn, Ricardo A., Idiart, Martín Ignacio, Ponte Castañeda, Pedro
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2012
Materias:	Ingeniería Mecánica Dilatational plasticity Homogenization Microstructural effects Polycrystals Porous materials
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/84415
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-84415
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ingeniería Mecánica Dilatational plasticity Homogenization Microstructural effects Polycrystals Porous materials
spellingShingle	Ingeniería Mecánica Dilatational plasticity Homogenization Microstructural effects Polycrystals Porous materials Lebensohn, Ricardo A. Idiart, Martín Ignacio Ponte Castañeda, Pedro Modeling microstructural effects in dilatational plasticity of polycrystalline materials
topic_facet	Ingeniería Mecánica Dilatational plasticity Homogenization Microstructural effects Polycrystals Porous materials
description	In a recent paper [1] we presented a new constitutive model for the viscoplastic response of polycrystalline aggregates accounting for local anisotropy induced by crystal plasticity and dilatational effects associated with the presence of intergranular cavities. In this contribution we provide a summary of our findings, as well as previously unpublished details of the numerical algorithm underlying this novel formulation. The formulation is based on homogenization and captures microstructural effects on the dilatational plastic behavior of polycrystalline materials. These effects are relevant to many engineering problems in which the presence of cavities embedded in a heterogeneous and anisotropic polycrystalline matrix must be accounted for, and for which standard polycrystalline models of incompressible plasticity, or dilatational plasticity formulations for voided materials with uniform properties of the matrix, have been proven to be insufficient. The present approach makes use of variational linearcomparison homogenization methods to develop constitutive models simultaneously accounting for texture of the matrix, porosity and average pore shape and orientation. The predictions of the models are compared with full-field numerical simulations based on fast Fourier transforms to study the influence of different microstructural features (e.g. overall porosity, single-crystal anisotropy, etc.) and triaxiality on the dilatational viscoplastic behavior of voided fcc polycrystals.
format	Articulo Articulo
author	Lebensohn, Ricardo A. Idiart, Martín Ignacio Ponte Castañeda, Pedro
author_facet	Lebensohn, Ricardo A. Idiart, Martín Ignacio Ponte Castañeda, Pedro
author_sort	Lebensohn, Ricardo A.
title	Modeling microstructural effects in dilatational plasticity of polycrystalline materials
title_short	Modeling microstructural effects in dilatational plasticity of polycrystalline materials
title_full	Modeling microstructural effects in dilatational plasticity of polycrystalline materials
title_fullStr	Modeling microstructural effects in dilatational plasticity of polycrystalline materials
title_full_unstemmed	Modeling microstructural effects in dilatational plasticity of polycrystalline materials
title_sort	modeling microstructural effects in dilatational plasticity of polycrystalline materials
publishDate	2012
url	http://sedici.unlp.edu.ar/handle/10915/84415
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bdutipo_str	Repositorios
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Modeling microstructural effects in dilatational plasticity of polycrystalline materials

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