... the effect of the as-deposited surface finish and the bulk material on the tensile and fatigue properties. In addition, the effect of material orientation was also considered to be important. Microstructural characterization demonstrated the complex nature of the grain morphology arising from...

... of a higher strength pressure vessel steel is presented, showing a difference in elastic/plastic partitioning may be accompanied by a difference in reduction in lifetime due to hydrogen. hydrogen strain-life fatigue Proceedings of the ASME 2022 Pressure Vessels & Piping Conference PVP2022 July 17...

... is not well understood; therefore, the effect of gaseous H 2 on the mechanical properties of MDPE needs to be examined. In the current study, we investigate the effects of gaseous H 2 on fatigue life and fracture resistance of MDPE in the presence of 3.4 MPa gaseous H 2 . Fatigue life tests were also...

... Abstract Low alloy ferritic steels used in fabricating cost-effective cylinders for hydrogen storage are susceptible to hydrogen embrittlement. A model first proposed by Amaro et al. (ARFiDS model) for predicting the effects of hydrogen pressure on the kinetics of hydrogen assisted fatigue...

.... crossover piping seismic isolation fatigue ductile rupture Proceedings of the ASME 2022 Pressure Vessels & Piping Conference PVP2022 July 17-22, 2022, Las Vegas, Nevada, USA PVP2022-85412 SEISMIC ASSESSMENT OF CROSSOVER PIPING ON A SODIUM COOLED FAST REACTOR WITH THREE-DIMENSIONAL ISOLATION SYSTEM...

... Abstract The 1963 ASME Section III design fatigue curve was generically applicable to a range of stainless steels in low cycle fatigue. In high cycle fatigue the behavior is sensitive to factors such as material strength, which raises questions about the applicability of the post-2009 ASME III...

... Abstract In the 2009 addendum to the ASME BPV Code [1], new design fatigue curves were adopted for austenitic stainless steel and nickel-based alloys. These changes followed publication of NUREG/CR-6909 [3] which, in addition to describing a methodology to account for environmental effects...

... Abstract This paper introduces and discusses the commonly used methods for calculating environmental penalty factors (F en ) to be used in fatigue assessment of stainless reactor components. Three alternative methods for determining F en factors are introduced and instructed in the JSME S NF1...

... Abstract The design fatigue curves applied for safety class 1 components in NPP’s are based on an experimentally determined strain-life fatigue data, the resulting ε-N reference curves and transferability margins. To account for detrimental effects of coolant water environment, penalty factors...

... Abstract Based on a recently developed multi-scale fatigue-fracture-NDE reliability model for uncracked and cracked pipes (see Fong-Marcal-Rainsberger-Heckert-Filliben-Doctor-Finney, PVP2021-62169), we apply the same modeling technique to a comparative study of three approaches to fatigue-life...

... Abstract Fatigue is a phenomenon identified as a significant degradation mode which affects industrial facilities, in particulier the lifespan of nuclear power plants. As one of its important branches, the environmentally assisted fatigue (EAF) considers not only effects of unfavorable...

... Abstract The aim of this present paper is to investigate the influence of some joint design parameters on the fatigue strength of metric screws. This investigation involved different screws strength grades (8.8 and 12.9). The experimental tests were carried out on black oxidized M6 screws...

... Abstract In vibration service, small-bore piping connections, especially unsupported cantilever configurations, are associated with a high level of concern as potential fatigue crack initiation locations. Various international guidelines and procedures address the assessment of piping vibration...

... system design pressure at 10,200 psig with expectations of more than 1,000,000 stress cycles in a single day. A thermal flexibility analysis of the piping system along with a fatigue analysis for the entire piping components within the system is performed in accordance with ASME BPV code Section VIII...

..., for vibration-based fatigue, in the absence of any time history at all; it is common in industry to assess fatigue using frequency domain techniques. The most accurate frequency domain techniques, such as the ever-popular Dirlik’s method, are optimized for a very restricted class of fatigue curve. In closed...

... dynamic stresses and associated fatigue life. acoustic induced vibration (AIV) flow induced vibration (FIV) vibration vibration mitigation dynamic stress concentration ratio fatigue Proceedings of the ASME 2022 Pressure Vessels & Piping Conference PVP2022 July 17-22, 2022, Las Vegas, Nevada...

... growth resistance of pipeline girth welds. With this aim, fracture toughness and fatigue crack propagation tests were carried out at RT on a servo-hydraulic machine equipped with a pressure vessel. The CT samples used in these tests were extracted from different actual circular welds (respectively 350...

... of the Nonmandatory Appendix V guidance within the CPS Program will be described and recommendations for best practices. A brief overview of degradation-specific mechanisms for high energy piping and approaches for planninng/scheduling NDE inspections will be described. This overview will include: creep, fatigue...

... Abstract Fatigue design of nuclear power plant pressure boundary components necessitates the use of design curves, where the allowable number of cycles is a function of the applied stress intensity. Design curves are derived from best-fit curves to small-specimen data, which comprises a range...

... Abstract This paper discusses general principles, assumptions and challenges in management of fatigue in operating NPP’s. The roots and state-of-the-art in different design codes, design curves and rules are briefly reviewed. It is noted that the ASME Boiler and Pressure Vessel Code, Section...