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Prediction of the Plastic Strain Ratio Evolution of a Dual-phase Steel

3차원 미세조직에 기반한 잔류응력 하의 이상 조직강의 소성변형률비 예측

  • Received : 2015.07.24
  • Accepted : 2015.11.05
  • Published : 2015.12.01

Abstract

A microstructure-based finite element simulation was conducted to predict the plastic strain ratio (R-value) of a dual-phase (DP) steel. The representative volume elements (RVEs) concept was adopted for the image-based FE modeling and a 3D model was constructed using sequential 2D images. Each phase was considered with the von-Mises yield criterion and the Swift model. The Swift parameters were defined by the empirical equations based on the chemical composition. The developed model was applied to analyze the effect of residual stress on the R-value and stress distribution. In order to consider the residual stress development after cold rolling, 10 % compression was applied in the thickness direction and unloaded before the tensile stress was applied in the rolling direction. The results showed a reasonable prediction for the R-value evolution: a sharp increase at small strains was well described and a transition followed in the downward direction. The R-value evolution was analyzed using the stress distribution change on the π-plane

Keywords

R-value;Meso-scale;Representative Volume Element;Dual-phase Steel;Finite Element Simulation

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Acknowledgement

Grant : 첨단 기계부품소재 인력양성사업단