..., anchors, rocks, or any heavy equipment or objects, which may lead to mechanical damages. These mechanical damages are commonly characterized as dents. The objective of this work is to study the effect of the introduction of plain dents on the fatigue life of rigid risers under fully reversed bending...

... structures for wind turbines. These welded connections are typically made from the outside resulting in a weld root on the inside and a weld toe on the outside. Different S–N curves apply to these positions; therefore, stresses both on the inside and the outside are needed for fatigue assessment. From...

...Xutian Xue; Nian-Zhong Chen; Yongchang Pu A mooring fatigue assessment for mooring chain links of a semi-submersible in Offshore West Africa (OWA) is presented. Three cases that mooring chain links are subjected to pure tension, out-of-plane bending (OPB), and torque are considered...

... structural reliability methods on fatigue failure mode. The application of the fatigue reliability approach considers four 6 in flexible riser configurations: an original lazy-wave, a lazy-wave with less 30% of buoyancy length, another one with less 50% of buoyancy length and a free-hanging. Failure...

...Rodrigo C. da Costa; Luis. V. S. Sagrilo This paper addresses the statistical uncertainty in long-term fatigue damage in offshore structures due to the short-term simulation length used in time domain analysis of stresses. The paper focuses on steel risers applications. A new simulation-based...

...M. Liu; C. Cross The industry consensus would appear that the effect of currents on wave-induced fatigue damage accumulation is assumed as insignificant and can be ignored. Only when dealing with stability, ultimate limit state design, and vortex-induced vibration (VIV), is the recommended industry...

... by Selecting Fatigue Critical Piping Locations for Inspection Using Fuzzy-AHP Based Approach ,” Process Saf. Environ. Prot. , 102 , pp. 71 – 84 . 10.1016/j.psep.2016.02.013 [2] EI , 2007 , “ Guidelines for the Avoidance of Vibration Induced Fatigue Failure in Process Pipework ,” The Energy Institute...

... FFSHORE M ECHANICS AND A RCTIC E NGINEERING . Manuscript received July 29, 2015; final manuscript received May 27, 2016; published online June 27, 2016. Assoc. Editor: Celso P. Pesce. 29 07 2015 27 05 2016 Design of offshore structures Dynamics of structures Fatigue Fluid...

...Yue Jingxia; Liu Yuliang; Zhang Chi; Zeng Qi; Dang Zhifan Multiplanar tubular KK-joints are one of the most popular joint types in offshore structures, which are exposed to cyclic loads and fatigue damages. In this paper, a fatigue prediction method based on scaled model test is proposed. First...

... reliability methods can take advantage of available data and developments in computing technology to provide a strong basis for their reliable engineering decision making. This paper presents a simplified approach for assessing the strength and fatigue reliability of SCRs, accounting for the uncertainties...

... 18 08 2015 Fatigue Floating Offshore materials Risers Moorings Cable dynamics Fracture reliability Control Moored production systems Material performance Material applications With offshore oil and gas explorations increasingly extending to deep and ultra-deep waters...

..., 2014; published online March 18, 2014. Assoc. Editor: Bernt J. Leira. 26 03 2012 30 01 2014 The design of welded structures for the fatigue limit state is normally carried out by means of either linear or bilinear S-N curves, which have been found adequate to predict crack...

...S. Thöns; M. H. Faber; W. Rücker This paper develops the models for the structural performance of the loading and probabilistic characterization for the fatigue and the serviceability limit states for the support structure of offshore wind energy converters. These models and a sensitivity study...

... laser cutting to produce welded square hollow-section T-joints with similar or higher fatigue strengths than their conventional mechanical cut counterparts. A total of 21 full-scale T-joint samples, typical of those found in the agricultural industry, were included in this study. Nineteen...

... stress methods. Their abilities in effectively correlating the fatigue data collected from these tubular joints are demonstrated. These tests are also compared with the T curve typically used for fatigue design of tubular joints as well as the structural stress based master S-N curve adopted by ASME...

...Haiyan Long; Geir Moe The fatigue assessment of support structures is one of the most significant challenges in the design of offshore wind turbines (OWT). Fatigue analysis can be conducted in either the time-domain or the frequency-domain. The advantage of frequency-domain analysis is its time...

.... Our objectives are two-fold: (i) we use the measured data to describe complexities inherent in riser motions accompanying VIV; and (ii) we discuss how such data sets (and even less spatially dense monitoring) can be used effectively in predicting fatigue damage rates, which are of critical interest...

.... As a design driver for offshore steel structures, the fatigue life of the towers designed in the ultimate limit state should be assessed and the structures are consequently modified, if necessary. However, fatigue assessment is out of the scope of this paper and will be done in a later work. The material...

...Nur Syahroni; Stig Berge Residual stress may have a significant effect on the fatigue strength of welded joints. As a nonfluctuating stress, it has an effect similar to that of the mean stress. Recently the International Association of Ship Classification Societies (IACS) has issued Common...

...Amir G. Salem; Sam Ryu; Arun S. Duggal; Raju V. Datla The dynamics of an oil offloading catenary anchor leg mooring (CALM) buoy coupled with mooring and flow lines are directly related to the fatigue life of a mooring system, necessitating an accurate estimate of the buoy hydrodynamic response...