..., such as cracks. The presence of cracks can render a pipeline susceptible to failure, posing a significant threat to its operation, safety, and the environment. This underscores the importance of promptly detecting and evaluating even seemingly minor surface defects, as they can significantly damage...

... Abstract While the industry generally discounts fatigue growth of circumferential and off-axis cracks in mainline pipe as being a credible threat, it has occurred. Three instances of girth weld and one instance of spiral weld crack fatigue growth are examined in this presentation and modeled...

... of fracture is a widely used numerical method for predicting fracture-related phenomena in solids. The phase field method is a continuous or diffused approach to fracture that approximates the original crack into a diffused zone of fracture. The diffused region is represented by an auxiliary variable called...

... of their integrity management processes with excellent track records for both effectiveness and efficiency. Even though the PRCI burst model originally targeted pipe body stress corrosion cracking, operators have found the model performs equally well for discrete crack-like features associated with long seam welds...

... conventionally used in finite element calculations accompanying the phase-field method. The exponential characteristic of such special shape functions is made use of to reduce the mesh refinement level at crack propagation paths. This study suggests a learned orientation scheme for these shape functions...

..., specifically thick-walled reactor pressure containers with fractures and welds as weak areas. A thorough picture of the temperature and stress intensity is required to determine the likelihood of the onset and spread of a cleavage crack. The ductile to brittle transition temperature affects the critical stress...

... Abstract Fitting da/dN data with closed-form equations can introduce unwanted error into a crack growth model. Using a tabular look-up approach which remains strictly data-driven has historically found utility in aerospace, and could become equally useful in fitting emerging da/dN results...

... Abstract Over a five-year period, a series of fatigue crack growth experiments have been conducted in air and in a bubbling CO 2 environment to induce diffusible hydrogen ingress. While the main objective of the hydrogen-charging research targeted characterization of near-neutral stress...

...Proceedings of the ASME 2022 Pressure Vessels & Piping Conference PVP2022 July 17-22, 2022, Las Vegas, Nevada, USA PVP2022-84685 OPTIMIZATION DESIGN OF FOCUSING ELECTROMAGNETIC ACOUSTIC TRANSDUCER FOR CRACK DETECTION OF PRESSURE STRUCTURE Zhe Wang1, Zhichao Fan1, Yuanlian Su1, Jingwei Cheng1...

...” and “Penetrated crack assessment”. “Unstable fracture assessment” is conducted to determine a critical crack length, c cr , which introduces unstable fracture under given loading conditions. “Leak rate assessment” is carried out to determine detectable crack length, c d , above which sodium leakage can...

... Abstract ASME PVP conference papers from 2007 and 2008 (References [1] and [2]) discuss fatigue analyses related to 304 stainless steel instrumentation spacer rings (rings) that had cracked while installed in a thermal fatigue test loop. The rings contain circular radial penetrations extending...

... Abstract Pressure vessels can be subjected to various external local forces and moments acting in combination with main internal pressure. As a result of the stress system set up, and in the presence of attachment welds, surface cracks can occur on the interior and exterior walls...

... Abstract In this study, to determine appropriate cyclic hardening model for simulating creep-fatigue crack growth, sensitivity of hardening model on global/local deformation behavior during creep-fatigue crack growth is studied using finite element (FE) debonding analysis method. Three...

... at the deepest point of semi-elliptical flaws from a plate to those for an OD and ID circumferential flaw in a cylinder to confirm the conservatism of the G 0 coefficients from a plate geometry. crack stress intensity factor fracture mechanics COMPARISON OF STRESS INTENSITY FACTOR COEFFICIENTS...

... Welded joint crack J - A 2 methodology Constraint in fracture Fracture toughness fracture model For assessing the safety of welded structural components, it is necessary to investigate the effects of multiple factors, which include the component geometry, load level, weld width...

... 15MnNbR Spherical tanks in a lighter hydrocarbon reservoir were tested by internal MT. Almost whole circle crack located at fusion zone of the weld connecting equator plate and the lower pole plate was found. The cracks are parallel to the weld and the deepest depth is 10 mm. Through hardness...

... This paper presents the ratchet limit analysis of a pipe with a symmetric crack in a mismatched weld by using the extended Linear Matching Method (LMM). Two loading conditions are considered: i) a cyclic temperature load and a constant internal pressure; and ii) a cyclic temperature load...

...) of a cracked component/structure in which the magnitude of stress locally exceeds the elastic range at any load, although in reality the configuration will certainly permit plastic shakedown. In recent years, the “Non-Cyclic Method” (NCM) was proposed by the present authors to predict the entire ratchet...

... 14 01 2011 Compact tension C(T) specimens with a blunt notch are mechanically pre-compressed to introduce a tensile residual stress ahead of the notch. The specimens are then thermally soaked which results in crack extension due to the presence of the tensile residual stress. Neutron...

.... To calculate a stress intensity factor for a postulated crack considering the stress discontinuity with the plastic yielding of cladding, the scheme developed previously has been incorporated into the PASCAL code for the structural integrity analysis. Using the new scheme, conditional probabilities of crack...