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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
International Journal for Multiscale Computational Engineering
Импакт фактор: 1.016 5-летний Импакт фактор: 1.194 SJR: 0.554 SNIP: 0.68 CiteScore™: 1.18

ISSN Печать: 1543-1649
ISSN Онлайн: 1940-4352

Выпуски:
Том 17, 2019 Том 16, 2018 Том 15, 2017 Том 14, 2016 Том 13, 2015 Том 12, 2014 Том 11, 2013 Том 10, 2012 Том 9, 2011 Том 8, 2010 Том 7, 2009 Том 6, 2008 Том 5, 2007 Том 4, 2006 Том 3, 2005 Том 2, 2004 Том 1, 2003

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.2011002761
pages 599-608

MULTIFIELD CONTINUUM SIMULATIONS FOR DAMAGED MATERIALS: A BAR WITH VOIDS

Patrizia Trovalusci
Department of Structural Engineering and Geotechnics Sapienza University of Rome Via Gramsci 53, 00197 Rome, Italy
Valerio Varano
Department of Structures, Roma Tre University of Rome, 00146 Roma, Italy

Краткое описание

This work is based on the formulation of a continuum model with microstructure for the study of the mechanical behavior of microcracked materials. Such a continuum is named multifield continuum because it is characterized by field descriptors accounting for the presence of material internal structure. In particular, the disturbance due to the presence of distributed microcracks in the material is revealed by an additional kinematical field representing the smeared displacement jump over the microcracks. According to the approach of the classical molecular theory of elasticity, the constitutive multifield continuum (macromodel) has been obtained by requiring the energy equivalence with an appropriate discrete micromodel. The stress-strain relations of the continuum have been explicitly identified by selecting the response functions of the interactions of the discrete model and depend on the geometry of the material's internal phases. Attention is here focused on theoretical and numerical investigations on a one-dimensional microcracked bar by varying the microcrack density and size. The effectiveness of the multi-field model, in representing the gross mechanical behavior of such materials with internal structure, is ascertained by comparing the multifield solutions with the numerical solutions obtained by using finite-element simulations for a linear elastic strip having different distributions of voids.

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