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Computational assessment of the microstructure-dependent plasticity of lamellar gray cast iron - Part I: Methods and microstructure-based models

: Metzger, M.; Seifert, T.

Preprint urn:nbn:de:0011-n-3522427 (2.0 MByte PDF)
MD5 Fingerprint: 0c3a6412946cef2d180a8af36ca2c6e9
Created on: 28.04.2017

International Journal of Solids and Structures 66 (2015), pp.184-193
ISSN: 0020-7683
Journal Article, Electronic Publication
Fraunhofer IWM ()
gray cast iron; microstructure; micromechanics; serial sectioning; volume elements; statistical volume elements

This paper focuses on the microstructure-dependent inelastic behavior of lamellar gray cast iron. It comprises the reconstruction of three dimensional volume elements by use of the serial sectioning method for the materials GJL-150, GJL-250 and GJL-350. The obtained volume elements are prepared for the numerical analyses by means of finite-element method. In the finite-element analysis, the metallic matrix is modeled with an elastic-plastic deformation law. The graphite inclusions are modeled nonlinear elastic with a decreasing value of Young's modulus for increasing tensile loading. Thus, the typical tension-compression asymmetry of this material class can be described. The stress-strain curves obtained with the microstructure-based finite-element models agree well with experimental curves of tension and compression tests. Besides the analysis of the whole volume element, the scatter of the stress-strain response in smaller statistical volume elements is investigated. Furthermore, numerical studies are performed to reduce computational costs.