...The cyclic corrosion test as DIN 55665 standard was selected as the main standardized accelerated corrosion test for pure corrosion test and simultaneous fatigue-corrosion tests. ⁹ As shown in Figure 2 , the test is based on 3 different cycles which alternate during a week...

... conducted with CP applied to the surfaces outside one end of the gap and with CP applied to both sides. This paper describes the results obtained including potential and current measurements, surface analysis, and the use of the results as input to the fatigue analysis for the monopile. Cathodic protection...

... and finally full-scale testing demonstrating the sleeve is compatible with standard welding processes. An in-depth analysis of the conditions and results of the fatigue testing campaign specifics, covering both carbon steel and electro-fusion welds dynamic behavior is proposed. The present paper focuses...

... on external surface when operating condition reaches room temperature. Degradation of cold thermal insulation provides accessibility for air-borne chloride to the pipe. Fatigue crack propagation through metal is driven by thermal stress during start/stop service operation period proven by microstructure...

... help External Corrosion Direct Assessment (ECDA) locate severe corrosion features, especially for lines that are non-piggable. Also, these discoveries can provide guidance for future research and pipeline integrity management with external corrosion. external corrosion pressure fluctuations fatigue...

...oilsands truck frame cracking fatigue brittle fracture finite element analysis INTRODUCTION Abstract A study was performed to understand the mechanism of frame cracking on the mining haul trucks in an oilsands' operating site. A static finite element analysis (FEA) was completed to identify...

... energy. The hope is that, ultimately, an as accurate data basis as possible combined with experience and knowledge will lead to more standardized structures and hence reduction of cost. But to be more successful, more cooperation is needed. Offshore Wind Marine Corrosion Fatigue Protective Coatings...

... condition. The printed Alloy 718 material was produced on a single plate comprised of rectangular, cylindrical and round shapes of varying section thickness that were subjected to evaluation that included chemistry, microstructural, mechanical, fatigue and corrosion testing. Heat treated sections were...

...This paper presents a premature mooring chain link fatigue failure, which occurred at approximately 1/3 of its design life. The ensuing failure investigation identified the fatigue crack initiated at the bottom of a corrosion groove with its bottom in HAZs of the flash weld. The HAZ is neither...

... simulated bulk specimens. Duplex Stainless Steel Corrosion Chromium Nitrides Oil & Gas Pitting Fatigue Toughness INTRODUCTION The Vickers hardness indentations were performed and measured using an automatic Struers Duramin A-300 Macro-Indenter and with a load of 10 kgf (HV₁₀...

...Abstract Shot peening is used in many industrial applications, e.g. steam turbine blades, to induce near-surface compressive residual stresses and reduce the likelihood of failure by fatigue, corrosion fatigue and stress corrosion cracking. On the whole, shot peening has proven to be very...

...%) H₂S (pisa) pH Sour Environment 5 0.21 4.5 Test Method Crack Length Measurements Abstract Subsea flowlines and risers experience fatigue cycles due to thermal and/or pressure transients or vortex induced vibration (VIV). Flowlines and risers also experience extended period of constant hold...

... FATIGUE Abstract The first offshore wind turbine farm in the world Vindeby ⁽¹⁾ was constructed and commissioned back in 1991. The turbines have a capacity of 0.45 MW. Now 25 years later Vindeby will be decommissioned. As new turbines have much larger capacity than the existing one, replacing...

...Abstract Digital image correlation is an emergent strain-mapping methodology that allows full-field surface strain mapping by comparing the images of the same region before, during and after deformation. This technique has been used to explore fatigue crack growth rates and the development...

...Abstract This paper concentrates in defining an equation for crack length of a specimen Single Edge Notch Bend – Four Point (SENB-4P), applying the so-called Back-face Strain (BFS) method for a large extension and precision. The specimen type SENB-4P is well known and used in fatigue testing...

... accurate crack depth determination can be obtained. In contrast, there was very good agreement between the crack depth calculated from DCPD and that actually measured on the fracture surface, once a continuous crack front had been established. small crack steam turbine fatigue corrosion fatigue...

... of the features. The fracture surface was comprised of relatively small fatigue zone around the edge of the shaft, and a very large overload zone in the middle. In addition, ratchet marks were observed at the edge of fracture surface, indicating multiple cracking initiation origins and relatively high total...

... et al. ³ It is not possible to say how far this was relevant to the dry H₂S tests, but there is clearly a large increase in FCGR compared to air at higher ΔK values. Abstract Oil and gas fields can contain significant amounts of hydrogen sulphide (H₂S). The fatigue...

... inspection, eddy current and dye penetrant inspection, are reviewed in relation to their detection limits for inspecting titanium welds. The performance of welded titanium alloys, in seawater and oil and gas production environments, is discussed. This includes the corrosion, fatigue, fracture toughness...

...When a bolted joint fails due to fatigue, personnel often resort to installing a larger or stronger bolt but they still have not solved the fatigue problem if they do not torque the bolt to its' proper preload ⁽⁴⁾ . The more a fastener is torqued; the stronger it gets, within of course...