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Based on the assumption that a representative element of a pearlitic steel is an aggregate ofnumerous spherical pearlitic colonies with randomly distributed orientations,and that each colony is com-posed of many parallel fine lamellas of ferrite and cementite,a description for the dual-phase pearlilic steel isobtained by making use of a microstructure-based constitutive equation for a single dual-phase pearlitic colonyand the Hill’s self-consistent scheme.The elastoplastic response of dual-phase pearlitic steel BS11 subjectedto asymmetrically cyclic loading is analyzed,and a comparison with the experimental results shows satisfacto-ry agreement.The non-proportional cyclic plasticity of BS11 is also analyzed,in which stress develops alonga semi-circle in a biaxial tension/compression and shear stress plane,as is typically experienced by the sur-face elements in rolling and sliding contact.
Based on the assumption that a representative element of a pearlitic steel is an aggregate of numerous spherical pearlitic colonies with randomly distributed orientations, and that each colony is com-posed of many parallel fine lamellas of ferrite and cementite, a description for the dual-phase pearlilic steel isobtained by making use of a microstructure-based constitutive equation for a single dual-phase pearlitic colony and the Hill’s self-consistent scheme. The elastoplastic response of dual-phase pearlitic steel BS11 subjected to an asymmetrically cyclic loading is analyzed, and a comparison with the experimental results show that the non-proportional cyclic plasticity of BS11 is also analyzed, in which stress runs alonga semi-circle in a biaxial tension / compression and shear stress plane, as is typically experienced by the sur-face elements in rolling and sliding contact.