SMALL-STRAIN MATERIAL TESTReturn-mapping algorithm ↗

Yielding, unloading, and reverse loading

Uniform gauge response · deformation ×25 · drag to rotate
Stress
Elastic strain
Plastic strain

Stress–strain history Blue: selected model · grey: other models

Current yield interval Uniaxial stress axis

Isotropic hardening expands the interval. Kinematic hardening moves its centre. This is the uniaxial analogue of a yield surface, not a full three-dimensional stress plot.