Artículos de revistas
Effective properties of nodular cast-iron: A multi-scale computational approach
Fecha
2014-02Registro en:
Godoy, Luis Augusto; Boccardo, Adrian Dante; Giusti, Sebastian Miguel; Carazo, Fernando Diego; Effective properties of nodular cast-iron: A multi-scale computational approach; Elsevier Science; Computational Materials Science; 82; 1; 2-2014; 378-390
0927-0256
CONICET Digital
CONICET
Autor
Carazo, Fernando Diego
Giusti, Sebastian Miguel
Boccardo, Adrian Dante
Godoy, Luis Augusto
Resumen
A numerical approach based on a computational constitutive multi-scale model is used in this work to predict the effective Young’s modulus and Poisson’s ratio of a pearlitic nodular cast iron. The Representative Volume Element (RVE) is defined based on a set of micrographs acquired from an optical device. For each micrograph, two RVE with different shape, rectangular and hexagonal, are defined. The volume fraction of graphite and metal matrix and the boundary of each object were identified on each RVE by using a procedure of image enhanced and segmentation. The set of RVE obtained was meshed with triangular finite elements. The numerical results obtained with rectangular and hexagonal RVE are compared with results obtained by means of an analytical expression. The influence of graphite fractions, aspect ratios and nodularity are investigated. The results show that graphite fraction has the largest influence on the effective modulus E. This feature is independent of the external shape of the RVE. Only one multi-scale model show a good agreement with the analytical expression in the effective modulus E. Also, the influence of the graphite volume fraction on the effective Poisson’s ratio is investigated by means of multi-scale simulation.