Investigation on the Crack Initiation of V-Shaped Notch Tip in Precision Cropping

Table 2

Parameters of 45 steel bars.

Mechanical parameters	Values
Diameter /mm	15
Notch depth /mm	1.5
Corner radius /mm	0.2
Flare angle /°	60
Fracture toughness /MPa·m^0.5	102.78
Crack extension threshold /MPa·m^0.5	8
Tensile ultimate strength /MPa	639
Yield limit /MPa	377
Contraction of cross section area	0.4
Fracture ductility	0.465
Strain hardening coefficient	0.179
Elastic modulus /N·m^−2
Extensibility	22.02%