140 120 100 80 . Plane strain Equal (balanced) biaxial Major strain, Major strain Low-carbon steel After positive stretching stretching strain Failure zone Minor Minor strain negative 60k Pure Brass High-strength ANAluminum alloy Minor strain, positive shear 40 steel Alumi 2 tension\ ! ../, Safe zone - Simple (for R-1) 60-40 -20 0 20 40 60 80 Minor strain (%) 140 120 100 80 . Plane strain Equal (balanced) biaxial Major strain, Major strain Low-carbon steel After positive stretching stretching strain Failure zone Minor Minor strain negative 60k Pure Brass High-strength ANAluminum alloy Minor strain, positive shear 40 steel Alumi 2 tension\ ! ../, Safe zone - Simple (for R-1) 60-40 -20 0 20 40 60 80 Minor strain (%)