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Alloy applicability ASME ASTM brittle crack propagation brittle fracture problem Charpy impact Charpy impact test cleavage congruency principle curve decreases defect design engineering determined drop-weight test ductility concept effect elastic elasticity theory embrittling factor energy release rate engineering practice equation example experimental failure Feely fibrous tearing fracture mechanics fracture surface fracture toughness frangible region G.R. Irwin geometry gross beam depth gross plastic flow Heat Treated J.D. Lubahn Kihara limited load stress Masubuchi measured metal methods mild steel mode of crack NDT temperature nominal stress notch bend test notch depth noticeable plastic occur plastic bend plastic deformation plastic flow preceding plastic strain plasticity analysis preceding crack initiation prior to crack reference residual stress Sachs shows Steam Turbine strain rate stress distribution tensile test term brittle fracture tough-frangible transition transition temperature approach triaxiality UNIAXIAL DUCTILITY unnotched disk unnotched ductility Welding Jr Welding Research work-absorption rate yield strength