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CHARACTERISTIC CRACK TIP FIELD AND THE CHARACTERIZING
EFFECT OF TENSIONCOMPRESSIVE CYCLING ON FATIGUE CRACK
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analysis applied stress approximation ASTM behaviour bending boundary conditions calculated Chudnovsky components constant corresponding crack extension crack front crack length crack problems crack propagation crack surface crack tip element crack tip field criterion curve damage determined dimensional dislocation ductile ductile fracture effect elastic elastic-plastic evaluated experimental fatigue crack finite element finite element method fracture mechanics fracture toughness function geometry given Hartranft inclusion incremental instability J-integral KEYWORDS ligament linear linear elastic load material maximum Mech mesh microcracks microstructure mode nodes notch nucleation numerical obtained parameter plane strain plane stress plastic deformation plastic zone Poisson's ratio predicted present R-curve ratio region relation residual stresses shear stresses shell shown in Fig singular solution specimens stable crack growth steel strain energy strain hardening strain rate stress field stress intensity factor structure temperature tension theory three-dimensional tion values void growth weld metal