Effective properties of nodular cast-iron: A multi-scale computational approach

• Published in: Computational materials science Vol. 82; pp. 378 - 390
• Main Authors: Carazo, F.D., Giusti, S.M., Boccardo, A.D., Godoy, L.A.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.02.2014; Elsevier
• Subjects: Applied sciences; Elasticity. Plasticity; Exact sciences and technology; Finite element; Material characterization; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Multi-scale modeling; Nodular cast iron; Representative volume element; Material characterization; Representative volume element; Multi-scale modeling; Finite element; Nodular cast iron; Constitutive equation; Elasticity; Young modulus; Finite element method; Poisson ratio; Multiscale method; Analytical method; Microstructure; Ductile cast iron
• ISSN: 0927-0256; 1879-0801
• DOI: 10.1016/j.commatsci.2013.09.044

•Predicting effective properties using different representative volume elements.•Comparing different multi-scale models to predict effective properties.•Comprehensive methodology for micro-structures characterization.•Potential applications to study and predict effective properties in alloys. 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.