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A microstructure-based description for cyclic plasticity of pearlitic steel with experimental verification
International Journal of Solids and Strnctures 39(2002)419-434,-0001,():
Making use of the microstructure-based constitutive equation for a single dual-phase pearlitic colony and the KBW's self-consistent scheme, a description of dual-phase pearlitic steel is performed. It is based on the assumption that a representative element of the material is an aggregate of numerous spherical pearlitic colonies with randomly distributed orientations, and each colony is composed of many parallel fine lamellas of ferrite and cementite. The corresponding numerical algorithm is developed. The cyclic plasticity of single-phase hard-drawn copper and dual-phase pearlitic steel BS11 subjected to asymmetrically cyclic loading is analyzed and compared with the experimental results. The nonproportional cyclic plasticity of the two materials is also analyzed, in which stress develops along a semi-circle in biaxial tension/compression and shear stress plane, as is experienced by the surface elements in a rolling and sliding contact. The local responses of ferrite and cementite for prescribed orientations are investigated simultaneously. The developed approach can describe the main characteristics in the cyclic plasticity of the dual-phase materials. The corresponding numerical algorithm shows successful stability concerning convergence and accuracy at a large number of cycles.
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