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Computational assessment of the microstructure-dependent plasticity of lamellar gray cast iron – Part IV: Assessment of the yield surface after plastic loading

  • In this paper the yield surface of a recently presented microstructure-based volume element of the gray cast iron material GJL-250 is assessed after different plastic loading histories. The evolution of the yield surface is investigated for different volumetric, deviatoric and uniaxial loadings. The micromechanical material properties of the metallic matrix and the graphite inclusions areIn this paper the yield surface of a recently presented microstructure-based volume element of the gray cast iron material GJL-250 is assessed after different plastic loading histories. The evolution of the yield surface is investigated for different volumetric, deviatoric and uniaxial loadings. The micromechanical material properties of the metallic matrix and the graphite inclusions are validated by means experimental stress-strain hysteresis loops. The metallic matrix is modeled as elastic-plastic with a non-linear kinematic hardening law. The graphite inclusions are described by means of a volumetric strain state dependent Young’s modulus. The results show that the shape of the yield surface does not change significantly in comparison to the initial yield surface after pure deviatoric loadings. After volumetric loadings, the dependence of the material on the Lode angle is significantly reduced. Uniaxial tensile preloadings result in a deformed yield surface, whereby the magnitude of the deformation depends on the applied load. Uniaxial preloadings to compression do not change the shape of the initial yield surface.show moreshow less

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Metadaten
Author:Mario Metzger, Thomas SeifertGND
Publisher:Elsevier
Year of Publication:2018
Language:English
GND Keyword:Eisenguss; Mikrostruktur; Plastizität
Tag:Cyclic plasticity; Gray cast iron; Micromechanics; Microstructure; Yield surface
DDC classes:600 Technik, Medizin, angewandte Wissenschaften
Parent Title (English):International Journal of Solids and Structures
Volume:141-142
ISSN:0020-7683
First Page:173
Last Page:182
Document Type:Article (reviewed)
Institutes:Hochschule Offenburg / Bibliografie
Acces Right:Zugriffsbeschränkt
Release Date:2019/01/03
Licence (German):License LogoEs gilt das UrhG
DOI:https://doi.org/10.1016/j.ijsolstr.2018.02.020