TAILIEUCHUNG - Identification of material parameters based on a homogenization method using EBSD data
In this paper, an optimized homogenization method using uniaxial tensile tests to estimate material parameters in the micromechanical model of a heat treated DC04 steel is introduced. The method is based on a representative element model for the macroscopically homogeneous material. | Vietnam Journal of Mechanics, VAST, Vol. 37, No. 1 (2015), pp. 1 – 15 DOI: IDENTIFICATION OF MATERIAL PARAMETERS BASED ON A HOMOGENIZATION METHOD USING EBSD DATA Phan Van Tung Duy Tan University, Da Nang, Vietnam National University of Singapore, Singapore E-mail: phanvantung@ Received March 18, 2014 Abstract. In this paper, an optimized homogenization method using uniaxial tensile tests to estimate material parameters in the micromechanical model of a heat treated DC04 steel is introduced. The method is based on a representative element model for the macroscopically homogeneous material. A Taylor polycrystal model is applied at integration points and simultaneously accounting for experimental electron backscatter diffraction (EBSD) data. Computational macro stress-strain curves are compared to experimental stress-strain curves to estimate the parameters of the DC04 steel at the different angles to rolling direction (RD). Keywords: Heat treated DC04 steel, elastoviscoplastic material, finite element method, Taylor type polycrystal model, EBSD texture data, MTEX toolbox. 1. INTRODUCTION Most of metals used in industrial applications are polycrystalline materials. As observed in experimental micrograph, they are the set of grains with identified grain boundaries. Each grain is the aggregate of single crystals having approximately homogenous orientation. In crystallography, the crystal structure or the arrangement of atoms is considered as a cubic shape. As studied by [1] and [2], the anisotropic plasticity of polycrystalline materials is mainly caused by non-uniform distributions of crystal orientations. Therefore, the analysis of the crystallographic texture, ., preferred crystal orientations, plays an important role when investigating the macroscopic material behavior. The experimental EBSD technique, known as Scanning Electron Microscope (SEM) based technique, has become a major tool in measuring crystal orientations .
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