Mechanical Behavior of metallic Materials The Stress-Concentration Factor 2a max 1+ b 2 b O max a(1+2/p) ≈2o√a ③大季Mechanical Behavior of Metallic Materials The Stress-Concentration Factor max 2 1 a a b   = + 2 b a  = max (1 2 ) 2 a a a a      = + 