A study of fracture mechanics: part I, Stress characterization in the fatigue crack tip plastic zone : part II, An examination of the corrosion fatigue crack tip zone : part III, Cyclic softening of 4340 and maraging high strength steels
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STRESS CHARACTERISATION IK THE FATIGUE CRACK TIP PLASTIC ZONE
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aged maraging steel aluminum alloy annealed maraging steel applied stress calculated carbides compact tension specimens constant strain amplitude Corrosion fatigue crack corrosive environment crack growth rates crack length crack tip plastic cycles of loading cyclic deformation cyclic plastic zone cyclic softening Cyclic strain softening cyclically loaded distances from crack fatigue crack tip fatigue deformation fatigue specimens Finite Element Method foils are parallel fracture mechanics frequency further annealed intensity factor range Linear Elastic materials micrographs of 1100 microhardness microstrain MN/m Modified Dugdale Model observed obtained parallel to YZ-plane pet NaCl solution plane strain plane stress plastic deformation plastic strain plastic zone length precipitates selected area diffraction shown in Fig steel fatigued strain hardening exponent strengthening stress distribution stress intensity factor stress-strain curve surface measurement tip plastic zone Trans Transmission electron micrographs X-ray diffraction X-ray line broadening yield strength yield stress yield zone