534 Stress and Strain Analysis in Temper Rolling for Mild Steel Sheet by Elastic-Plastic Finite Element Method

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The temper rolling is applied to eliminate the stretcher strain, to improve the flatness and to control the surface roughness of material rolled. However, there are some problems remains in analysis of the temper rolling process. The classical rolling theories based on the rigid plastic theory, can not deal with un-uniform elastic-plastic deformation in the temper rolling process due to the deformation is particularly concentrated near the surface layer. This paper presents elastic-plastic finite element analyses of stress and deformation behaviors in the plane strain temper rolling for as-annealed mild steel sheet. In the analyses, the upper yield point, the lower yield point and yield point elongation are taken into account for the stress-strain relation of the material deformed. For the contact boundary between the roll and the deforming material, both slipping and sticking are considered, and the Coulomb friction law is employed to represent the slipping friction. The calculations are conducted about thickness reduction of 0.5%, 1.0%, 2.0% and 5.0%, and the coefficient of friction in the slipping zone of 0.1,0.2 and 0.3 to investigate the effect on stress and strain behaviors. In the case of reduction of 0.5%, the yield stress moves down from the upper yield point to the lower yield point, and in the reduction of 2.0%, the yield point elongation is completely finished.
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