Título:	Determination of the effective elastic modulus for nodular cast Iron using the boundary element method
Autor(es):	Betancur, Adrián Anflor, Carla Tatiana Mota Pereira, André Leiderman, Ricardo
ORCID:	https://orcid.org/0000-0002-6687-1197 https://orcid.org/0000-0003-3941-8335
Assunto:	Métodos dos elementos de contorno Volume elementar representativo Homogeneização
Data de publicação:	2018
Editora:	MDPI
Referência:	BETANCUR, Adrián et al. Determination of the effective elastic modulus for nodular cast Iron using the boundary element method. Metals, v. 8, n. 8, Article 641. DOI: https://doi.org/10.3390/met8080641. Disponível em: https://www.mdpi.com/2075-4701/8/8/641. Acesso em: 23 out. 2019.
Abstract:	In this work, a multiscale homogenization procedure using the boundary element method (BEM) for modeling a two-dimensional (2D) and three-dimensional (3D) multiphase microstructure is presented. A numerical routine is specially written for modeling nodular cast iron (NCI) considering the graphite nodules as cylindrical and real geometries. The BEM is used as a numerical approach for solving the elastic problem of a representative volume element from a mean field model. Numerical models for NCI have generally been developed considering the graphite nodules as voids due to their soft feature. In this sense, three numerical models are developed, and the homogenization procedure is carried out considering the graphite nodules as non-voids. Experimental tensile, hardness, and microhardness tests are performed to determine the mechanical properties of the overall material, matrix, and inclusion nodules, respectively. The nodule sizes, distributions, and chemical compositions are determined by laser scanning microscopy, an X-ray computerized microtomography system (micro-CT), and energy-dispersive X-ray (EDX) spectroscopy, respectively. For the numerical model with real inclusions, the boundary mesh is obtained from micro-CT data. The effective properties obtained by considering the real and synthetic nodules’ geometries are compared with those obtained from the experimental work and the existing literature. The final results considering both approaches demonstrate a good agreement.
Unidade Acadêmica:	Faculdade de Ciências e Tecnologias em Engenharia (FCTE) – Campus UnB Gama
Licença:	© 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
DOI:	https://doi.org/10.3390/met8080641
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