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ahead alloys antiplane applied stress behaviour bend brittle calculated carbide cleavage fracture compliance components constant crack extension crack growth crack length crack of length crack propagation crack tip criterion critical value curve decrease deformation derived dislocations displacement ductile effect elastic/plastic equation experimental failure fatigue crack fibrous fracture fracture mechanics fracture stress fracture toughness free surfaces geometry given grain hole increase initiation instability intensification Knott linear elastic material material's matrix maximum Mech method mild steel Mode notched bar obtained occur plane strain plane stress plastic flow plastic zone plate Poisson's ratio pop-in produce radius region relationship secant line Section shear lips shear stress shown in Figure situation slip-line field solution specimen square fracture strain energy stress concentrator stress distribution stress field stress function stress intensity temperature tensile stress tension testpiece thickness transition Westergaard width yield load yield stress Young's modulus zero