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The Significance of Crack Tip Blunting Stretch Zones
Ductile Fracture Mechanisms of Structural Steels
Ductile Fracture in HighStrength Structural Steels
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alloys ASTM austenite bainite calculated carbides Charpy cleavage fracture compact tension crack extension crack front crack length crack opening displacement crack propagation crack tip critical CT-specimens CTOD curve decohesion decrease deformation determined dislocation distribution ductile crack ductility effect elastic equation evaluated experimental fatigue pre-cracking ferrite Figure fracture mechanics fracture strain fracture strength fracture stress fracture surface fracture toughness geometry grain boundary graphite heat treatment impact energy inclusions increase influence initiation investigated J-integral J-R-curve Knott lateral expansion load lower martensite material matrix maximum measured mechanical properties microstructure nucleation obtained orientation parameter particles plane strain plastic zone quenched R-curve rolling room temperature scatter shown shows stable crack growth steel strain hardening stress intensity factor stretch zone structure Table tempering temperature tensile specimens tensile tests testpieces thickness toughness values transition temperature ture upper shelf voids weld metal width yield strength yield stress