A micro-mechanical analysis of thermo-elastic properties and local residual stresses in ductile iron based on a new anisotropic model for the graphite nodules: Paper

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Abstract

In this paper, the thermo-elastic behavior of the graphite nodules contained in ductile iron is derived on the basis of recent transmission electron microscopy investigations of their real internal structure. The proposed model is initially validated by performing a finite element homogenization analysis to verify its consistency with the room-temperature elastic properties of ductile iron measured at the macro scale. Subsequently, it is used to investigate the formation of local residual stresses around the graphite particles by simulating the manufacturing process of a typical ferritic ductile iron grade, and the results are compared with preliminary measurements using synchrotron x-rays. Finally, the obtained accurate description of the stress & strain field at the micro scale is used to shed light on common failure modes reported for the nodules and on some peculiar properties observed in ductile iron at both micro and macro scale.
Original languageEnglish
Article number055012
JournalModelling and Simulation in Materials Science and Engineering
Volume24
Issue number5
ISSN0965-0393
DOIs
Publication statusPublished - 2016

Keywords

  • Micromechanics
  • Synchrotron x-ray diffraction
  • Ductile iron
  • Anisotropic elasticity
  • Residual stresses
  • Graphite nodules

Cite this

@article{e0ef8454089d4cf6bf799478bf71edb0,
title = "A micro-mechanical analysis of thermo-elastic properties and local residual stresses in ductile iron based on a new anisotropic model for the graphite nodules: Paper",
abstract = "In this paper, the thermo-elastic behavior of the graphite nodules contained in ductile iron is derived on the basis of recent transmission electron microscopy investigations of their real internal structure. The proposed model is initially validated by performing a finite element homogenization analysis to verify its consistency with the room-temperature elastic properties of ductile iron measured at the macro scale. Subsequently, it is used to investigate the formation of local residual stresses around the graphite particles by simulating the manufacturing process of a typical ferritic ductile iron grade, and the results are compared with preliminary measurements using synchrotron x-rays. Finally, the obtained accurate description of the stress & strain field at the micro scale is used to shed light on common failure modes reported for the nodules and on some peculiar properties observed in ductile iron at both micro and macro scale.",
keywords = "Micromechanics, Synchrotron x-ray diffraction, Ductile iron, Anisotropic elasticity, Residual stresses, Graphite nodules",
author = "Tito Andriollo and Jesper Thorborg and Tiedje, {Niels Skat} and Hattel, {Jesper Henri}",
year = "2016",
doi = "10.1088/0965-0393/24/5/055012",
language = "English",
volume = "24",
journal = "Modelling and Simulation in Materials Science and Engineering",
issn = "0965-0393",
publisher = "IOP Publishing",
number = "5",

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TY - JOUR

T1 - A micro-mechanical analysis of thermo-elastic properties and local residual stresses in ductile iron based on a new anisotropic model for the graphite nodules

T2 - Paper

AU - Andriollo, Tito

AU - Thorborg, Jesper

AU - Tiedje, Niels Skat

AU - Hattel, Jesper Henri

PY - 2016

Y1 - 2016

N2 - In this paper, the thermo-elastic behavior of the graphite nodules contained in ductile iron is derived on the basis of recent transmission electron microscopy investigations of their real internal structure. The proposed model is initially validated by performing a finite element homogenization analysis to verify its consistency with the room-temperature elastic properties of ductile iron measured at the macro scale. Subsequently, it is used to investigate the formation of local residual stresses around the graphite particles by simulating the manufacturing process of a typical ferritic ductile iron grade, and the results are compared with preliminary measurements using synchrotron x-rays. Finally, the obtained accurate description of the stress & strain field at the micro scale is used to shed light on common failure modes reported for the nodules and on some peculiar properties observed in ductile iron at both micro and macro scale.

AB - In this paper, the thermo-elastic behavior of the graphite nodules contained in ductile iron is derived on the basis of recent transmission electron microscopy investigations of their real internal structure. The proposed model is initially validated by performing a finite element homogenization analysis to verify its consistency with the room-temperature elastic properties of ductile iron measured at the macro scale. Subsequently, it is used to investigate the formation of local residual stresses around the graphite particles by simulating the manufacturing process of a typical ferritic ductile iron grade, and the results are compared with preliminary measurements using synchrotron x-rays. Finally, the obtained accurate description of the stress & strain field at the micro scale is used to shed light on common failure modes reported for the nodules and on some peculiar properties observed in ductile iron at both micro and macro scale.

KW - Micromechanics

KW - Synchrotron x-ray diffraction

KW - Ductile iron

KW - Anisotropic elasticity

KW - Residual stresses

KW - Graphite nodules

U2 - 10.1088/0965-0393/24/5/055012

DO - 10.1088/0965-0393/24/5/055012

M3 - Journal article

VL - 24

JO - Modelling and Simulation in Materials Science and Engineering

JF - Modelling and Simulation in Materials Science and Engineering

SN - 0965-0393

IS - 5

M1 - 055012

ER -