1. Plastic anisotropy of dual-phase steels
- Author
-
Tsuneaki Sakaki, Koh-ichi Sugimoto, Y. Ohtakara, and K. Ohnuma
- Subjects
Materials science ,Continuum mechanics ,business.industry ,Mechanical Engineering ,Stress–strain curve ,Thermodynamics ,Structural engineering ,Plasticity ,Flow stress ,Matrix (mathematics) ,Flow (mathematics) ,Mechanics of Materials ,Phase (matter) ,General Materials Science ,business ,Anisotropy - Abstract
A continuum mechanics model on yielding and plastic deformation of dual-phase steels consisting of a large number of spherical second-phase islands dispersed in a matrix has been developed. The model is based on the Hill's theory on orthogonal anisotropy and the mean internal stress arising from the differences in strengths and plastic anisotropies of second phase and matrix with different elastic constants. The model can describe r value of dual-phase steels from r values and flow stresses of second phase and matrix. For the dual-phase steels with high yield stress ratio and flow stress ratio between second phase and matrix, the method of correction for the flow curves has been proposed. Laws of mixture on r value and flow stress of dual-phase steels have been proposed. The law of mixture on r value is available under some restricted conditions.
- Published
- 1990