...Guian Qian; Markus Niffenegger For LEFM, the K–T method provides a two-parameter fracture mechanics theory to describe crack tip stresses and deformation and is used for the integrity analysis of structures by considering the constraint effect. K I is calculated based on the real deformation...

... temperatures showed that the modeling used is suitable to obtain enveloping results. Fracture mechanics analyses were carried out for circumferential flaw sizes in the weld joint near the core region and between the RPV shell and the flange, as well as for axial flaws in the nozzle corner. Stress intensity...

...J. M. Alegre; I. I. Cuesta In order to calculate the fatigue life of cylinders subjected to internal pressure using the fracture mechanics approach, the stress intensity factors (SIFs) for internal semi-elliptical cracks are needed. Nowadays, the most accurate procedure for fatigue life calculation...

... into strain based assessment. Moreover, they can be coupled with fracture mechanics to assess cracks for which the state of stress must be known in the location of crack tip, not necessarily found in the dent peak. Furthermore, probabilities derived from the statistical distribution can be used in risk...

... purpose of the numerical thermal-hydraulic studies is to accurately estimate the distribution of fluid temperature in the downcomer and the heat transfer coefficients on the inner RPV surface for a fracture mechanics computation, which will subsequently assess the associated RPV safety margin factors...

... II (i.e., shear mode) fracture tests were undertaken with and without CNT applied locally at the joint interface. During the study, the image correlation technique was used to examine the fracture mechanisms altered by the introduction of CNT. The experimental study showed that CNT increased...

... for the stress intensity factor between the present work and the published solutions obtained by Raju and Newman ( 21 ) In the above examples, submodeling has been verified as an efficient, cost-effective approach in the calculation of fracture mechanics parameters in simpler examples; it is justified...

... ,” Proceedings of the 12th Fracture Mechanics Conference , American Society for Testing Materials , Philadelphia, PA , pp. 112 – 130 . Shih , C. F. , 1983 , “ Singular Field Quantities ,” Brown University Technical Report No. MRL E-147. Webster , G. A. , and Ainsworth , R. A. , 1994...

... Standards Institution , 1991 , “ Fracture Mechanics Toughness Tests. Method for Determination of KIC , Critical CTOD and Critical J Values of Metallic Materials,” BS7448-1. ASTM International , 1989 , “ Standard Test Method for Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement...

...K. Ragupathy; K. Ramesh; D. Hall The failure assessment diagram (FAD) is a simplified and robust flaw assessment methodology, which simultaneously connects two dominant failure criteria: linear elastic fracture mechanics on one end and plastic collapse on the other end. This interaction...

... , New York, NY . Niederreiter , H. , and Spanier , J. , 2000 , Monte Carlo and Quasi-Monte Carlo Methods , Springer-Verlag , Berlin . Rahman , S. , 2006 , “ A Dimensional Decomposition Method for Stochastic Fracture Mechanics ,” Eng. Fract. Mech. 0013-7944 , 73 , pp. 2093...

..., brittle fracture experiments were performed on carbon steel plates with two nonaligned flaws. From these calculations and experiments, authors studied the effect of stress intensity factor interaction on fracture behavior and proposed a new alignment rule for linear elastic fracture mechanics evaluation...

... formulas for thickness requirements and determination of peak stresses and stress distributions for fatigue and fracture mechanics analyses in thick blind ends. The use of these proposed design formulas provide a more accurate determination of the required thickness and fatigue life of blind ends...

... -integral and an elastic-plastic analysis to account for the primary and secondary stresses, and thus not using a ρ factor, i.e., K r = K J m / K mat . 03 08 2007 13 06 2008 23 01 2009 failure (mechanical) fracture mechanics internal stresses...

... a fracture mechanics framework. fatigue fracture mechanics steel Pressure vessel components will invariably experience nonuniform loading histories during their service life. The unpredictable nature of random fatigue has been the basis for motivating research on studying the effects...

.... This method is an extension of probabilistic fracture mechanics approach but is capable of modeling crack initiation, crack propagation, and crack depth density distribution at a given cycle. To verify the methodology, crack depth distribution observed in thermal fatigue test specimens was evaluated...

... undertaken by Sharples et al. were also influenced by the reduced level of stress triaxiality generated ahead of the crack when compared to conventional fracture mechanics tests. This well-established “constraint” effect arises from the influence of loading and crack size on the magnitude of the triaxial...

... of emergency core cooling was performed, and the leading leak size was determined. A fracture mechanics based assessment was carried out for extended circumferential flaws in the weld joint between the RPV shell and the flange, as well as for axial flaws in the nozzle corner. These flaw geometries postulated...

... monotonically, the midsection of the crack front will advance first, which will be followed by crack growth along the rest of the crack front, leading to the formation of a thumbnail shaped crack-front profile. From the viewpoint of fracture mechanics, crack tunneling will occur if the operating fracture...

... in establishing the vessel fatigue life. An example has been given to demonstrate the application of these new rules. The rules specified in KD-10 invoke fracture mechanics based design. The fracture and fatigue properties of the construction materials are required to be measured in a H 2...