Advances in Fracture Research. Failure Analysis, Remaining by B.L. Karihaloo, Y.-W. Mai, M.I. Ripley and R. O. Ritchie

By B.L. Karihaloo, Y.-W. Mai, M.I. Ripley and R. O. Ritchie (Auth.)

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1 and 2. In these FADs, the values of J i and Jq, were taken from the second node (J2) closest to the outer surface of the chord for the through thickness cracked joints. For the surface cracked joints the values of J-integral at the deepest point of crack were used to construct the FADs because these J values were found to be the maximum J values along the crack front. In each of the FADs, the standard FAD is plotted to compare with the FADs for the different cracked joints in each series. It can be seen that because conservative plastic collapse loads were used to construct the FADs, all the FAD curves for these tubular joints lie outside the standard Level 2 FAD given in PD 6493.

1). Uncracked Joint; 2). 15% through thickness crack, crack length = 15% of brace circumference; 3). 30% through thickness crack, crack length = 30% of brace circumference; 4). 3 Yield Stress = 327 MPa An isotropic work hardening rule, Von Mises yield criterion and incremental plasticity were used in the analyses. The properties of the weld metal and HAZ were assumed to be the same as those of the parent metal. For the elastic analyses the midside nodes on the crack tip elements were moved to the 1/4 points in order to model the 1/Vr singularity.

12. Constitutive equation(master curve) proposed of creep deformation and of s t tion δΦ/δ$>0 and the r a t i o , t / fracture. Symbols t i m e , t r for notched (DEN) specimens. are experimental date with various The s o l i d curve i s calculated one by s t r e s s and temperature. Eq, (12). Yokobori, Jr. et al(1993,1996b) Yokobori. Jr. and Yokobori(1996b) U f Yokobori 46 Jr. the steady creep rate, έ will decrease, s a y , become b r i t t l e a s t h e c r e e p d u c t i l i t y g i v e n by t h e r i g h t hand s i d e o f e q .

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