The influence of the graphite mechanical properties on the constitutive response of a ferritic ductile cast iron – A micromechanical FE analysis

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    Abstract

    In the present paper a micro-mechanical approach is used to investigate the influence of the graphite mechanical properties on the loading response in the early deformation range of ductile cast iron. A periodic unit cell composed by a single graphite nodule embedded in a uniform ferritic matrix is considered and elasto-plastic behavior of both constituents is assumed; damage evolution in the ductile matrix is taken into account via Lemaitre’s isotropic model. Full 3D and 2D plane-stress finite element analyses are performed to simulate the loading conditions experienced by nodules located in the bulk as well as on the material surface. The effects of residual stresses arising during the manufacturing process are also accounted for. It is shown that the constitutive response of the equivalent composite medium can match ductile cast iron only if the graphite Young’s modulus value lies within a certain interval, which differs from that reported in previous works on the subject. Experimental support for the numerical results is provided.
    Original languageEnglish
    Title of host publicationProceedings of the XIII International Conference on Computational Plasticity : Fundamentals and Applications
    EditorsE. Oñate, D.R.J. Owen, D. Peric, M. Chiumenti
    PublisherInternational Center for Numerical Methods in Engineering
    Publication date2015
    Pages632-641
    ISBN (Electronic) 978-84-944244-6-5
    Publication statusPublished - 2015
    EventXIII International Conference on Computational Plasticity: Fundamentals and Applications - Barcelona, Spain
    Duration: 1 Sept 20153 Sept 2015
    Conference number: 8

    Conference

    ConferenceXIII International Conference on Computational Plasticity
    Number8
    Country/TerritorySpain
    CityBarcelona
    Period01/09/201503/09/2015

    Keywords

    • Computational Plasticity
    • damage
    • Ductile Cast Iron
    • Micro-mechanics

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