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

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:66

Article

Metzger, M.^1,2  Seifert, T.¹ 

[1] Offenburg Univ Appl Sci, D-77652 Offenburg, Germany

[2] Fraunhofer Inst Mech Mat IWM, D-79108 Freiburg, Germany

关键词: Gray cast iron;    Microstructure;    Micromechanics;    Serial sectioning;    Volume elements;    Statistical volume elements;   

DOI  :  10.1016/j.ijsolstr.2015.04.016

来源: Elsevier

【 摘 要 】

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. (C) 2015 Elsevier Ltd. All rights reserved.

【 授权许可】

Free