... investigation mooring system wind energy martensite untempered martensite upstream oil & gas sub-sea system hardness proceedings martensite layer sensitivity europe government chain link surface layer crack growth stern roller strength gabrielsen microstructure crack initiation area...

... was consistent with published literature and ASME B31.12 for ΔK above 5 MPa√m. At ΔK below 5 MPa√m the fatigue crack growth is higher than predicted, possibly driven by a time dependent sustained cracking mechanism in certain microstructures. The practical relevance of these observations is presented...

... 0.1ppm hydrogen was absorbed into the steel, which is the level of hydrogen absorption under mildly sour environment. This result reminds us a possibility of hydrogen stress cracking, accordingly proper material should be recommended for the hydrogen use. Then, fracture toughness and fatigue crack growth...

... different loading path fatigue crack growth phase difference simulation metals & mining loading path hydraulic fracturing crack tip crack growth specimen growth behavior numerical simulation plastic strain non-proportional loading path propagation hysteresis curve y-axis...

... the blunting as part of tearing. This procedure is described in DNV-RP- F108. This paper compares reeling crack growth between the two approaches using an 18" diameter alloy overlay pipe. The comparison reveals that both methods give comparable crack growth. Detailed comparisons on safety margin are discussed...

... ABSTRACT This study investigated effects of addition of O 2 and CO to H 2 gas environments on a hydrogen-accelerated fatigue crack growth in a pipe steel. Both O 2 and CO inhibited the hydrogen-accelerated fatigue crack growth. The inhibitory effect of O 2 was well-interpreted...

... ABSTRACT The purpose of this study is to develop a simulation method to predict tensile strain limit for leakage from flaws in girth welds of high-pressure pipe. The material properties of each area in welds are measured by experiments using small size specimen. Ductile crack growth simulation...

... stress cycles, due to the everchanging wind direction. These events follow each other in time and are further expressed as load sequences. Load sequences may affect the fatigue life. A novel model consisting of a set of explicit equations is developed to estimate the fatigue crack growth including...

... uniaxial stress state stress intensity factor multiaxial stress state load level welding residual stress crack growth deformation stress concentration fatigue crack growth gusset model computation stress state characteristic tensor artificial intelligence residual stress initial...

... loading and corrosive conditions. Aim of the present work is the prediction of mixed-mode fatigue crack growth retardation due to stop holes. The solution is based on FEM analysis of the multiaxial stress state, the principle of minimum potential energy, the S-N curve of a corroded steel...

... Effect of Sour Acidizing Treatments on the Fatigue Crack Growth Performance of Welded C-Mn Line Pipe Steels Ramgopal Thodla1, Colum Holtam2, Weiwei Yu3, Jonathan Bowman3, Chris Leinweber3, Xiaoyan Yan3, Apurva Batra3, Brandon Gerst1 1DNV GL, Dublin, OH, USA 2DNV GL, Katy, TX, USA 3Chevron Energy...

... parameters are presented and compared, with respect to testing material and temperature. Additionally, a new analytical tool is utilized to determine the criticality of a growing crack in terms of determining the energy required for further crack growth following initiation of stable crack growth...

... qualitatively and quantitatively. It is essential to confirm the correct mechanism of crack growth under repetitive cycles of large strain. To establish the correct mechanism, segment tests with increased specimen "daylight" length are performed. After testing, the fracture surface is examined, measured...

... compared to angle bars. Jang (2010) investigated the crack path and the crack growth behavior of the T-section longitudinal stiffener, and Gan J (2016) studied the effect of shot peening on a T-welded joint. A series of fatigue tests with regard to the connections with bulb flats have been carried out...

... subsea system sequence wind turbine wind energy reservoir simulation load sequence effect offshore wind turbine history matching autocorrelation wind history offshore projects planning and execution fatigue damage crack growth time series time lag substructure load case history...

... loading scenario girth weld segment specimen hydraulic fracturing ductile midstream oil & gas specimen manufacturer thickness buckle arrestor assembly crack growth industrial application sequence segment testing notch offshore pipeline fracture surface Industrial Application...

... Abstract Retardation is a load sequence effect, which causes a reduced fatigue crack growth rate after an overload is encountered. Retardation can be cancelled when the overload is followed by an underload. The net effect is beneficial to the fatigue lifetime of Offshore Wind Turbines (OWTs...

.... The general approach is to postulate cracks of specific length and depth matching threshold of known inspection techniques and to have cracks located in specific directions at the hot spot locations and then predict the crack growth and failure probability of the postulated cracks. Based on the stress...

... strain range geometry piping design crack growth axial strain melis internal pressure double joint fst girth weld loading scenario piping simulation procedure flaw growth flaw tolerability scenario offshore pipeline upstream oil & gas Updates on Flaw Tolerability and Life...

... are modelled in a probabilistic manner. The failure probability of the cracks in the present and future states are calculated and probabilistic predictions of the crack growth are made. Finally, an outlook on possible usage of the results is given and advantages of a probabilistic analysis are discussed...