A STRAIN-BASED RELAXATION THEORY OF PLASTICITY FOR ANISOTROPIC METALS

A relaxation condition of the strain space formulation and a relaxatio n theory of plasticity for anisotropic metallic materials, which may b e undertaken in parallel with Hill's stress-based yield criterion and the traditional plasticity theory as an alternative approach, are deve loped. The calculated relaxation loci corresponding to different effec tive stress relaxation for zirconium alloys demonstrate certain advant ages in description of mechanical behaviour of elastic-plastic anisotr opic metallic materials.