An improved procedure for generating standardised load-time histories for marine structures

Li, Shanshan; Cui, Weicheng; Paik, Jeom Kee

doi:10.1177/1475090215569818

Cited by 6 publications

(10 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Li et al [37] have developed an improved procedure for creation of standardized load-time history for marine structures based on a short-term load measurement. The need for load-time history arises from the dependency fatigue crack growth behavior to load sequence efect.…”

Section: Failure Analysis and Preventionmentioning

confidence: 99%

Common Case Studies of Marine Structural Failures

Vukelić¹,

Vizentin²

2017

Failure Analysis and Prevention

View full text Add to dashboard Cite

Marine structures are designed with a requirement to have reasonably long and safe operational life with a risk of catastrophic failures reduced to the minimum. Still, in a constant wish for reduced weight structures that can withstand increased loads, failures occur due to one or several following causes: excessive force and/or temperature induced elastic deformation, yielding, fatigue, corrosion, creep, etc. Therefore, it is important to identify threats afecting the integrity of marine structures. In order to understand the causes of failures, structure's load response, failure process, possible consequences and methods to cope with and prevent failures, probably the most suitable way would be reviewing case studies of common failures. Roughly, marine structural failures can be divided into structural failures of ships, propulsion system failures, ofshore structural failure, and marine equipment failures. This book chapter will provide an overview of such failures taking into account failure mechanisms, tools used for failure analysis and critical review of possible improvements in failure analysis techniques.

show abstract

Section: Failure Analysis and Preventionmentioning

confidence: 99%

Common Case Studies of Marine Structural Failures

Vukelić¹,

Vizentin²

2017

Failure Analysis and Prevention

View full text Add to dashboard Cite

show abstract

“…This effect is extensively studied for single or periodically load cycles; however, it is also known that events with a series of large cycles may affect crack propagation. A typical example of such over-load effects for ships and offshore structures are storm events, see [21][22][23]. Fatigue design methods for OWTs are supposed to design against crack initiation, i.e., a through thickness crack; however, for large plate thickness, this also includes a period of macro-crack growth, see [13].…”

Section: Fatigue Design Of Offshore Wind Turbine Support Structures Including Ice Loading and Sub-zero Temperaturesmentioning

confidence: 99%

“…Another approach to apply realistic seasonal loading to fatigue test specimens could be exposing the specimens to the four load series successively. This could for example be achieved by a method proposed by Li et al [21]. Their idea could be adopted to ice load conditions; however, this can only be achieved without superimposing the different load conditions before generating the standardized stress-time series.…”

Section: Derivation Of Stress-time Series For Fatigue Testingmentioning

confidence: 99%

“…As the magnitude of loads due to ice action can be much higher than those related to wind and wave loading, differences in fatigue life under combined wind, wave, and ice action are expected. This is exacerbated by the fact that similar effects are well-known from overloading events in tension and compression, e.g., during storms [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of Combined Load Spectra for Offshore Structures Subjected to Wind, Wave, and Ice Loading

Braun¹,

Dörner²,

Veer³

et al. 2021

Preprint

View full text Add to dashboard Cite

Fixed offshore wind turbines continue to be developed for high latitude areas where not only wind and wave loads need to be considered, but also moving sea ice. Current rules and regulations for the design of fixed offshore structures in ice-covered waters do not adequately consider effects of ice loading and its stochastic nature on fatigue life of the structure. Ice crushing on such structures results in ice-induced vibrations, which can be represented by loading the structure using a variable-amplitude loading (VAL) sequence. Typical offshore load spectra are developed for wave and wind loading. Thus, a combined VAL spectrum is developed for wind, wave, and ice action. To this goal, numerical models are used to simulate the dynamic ice-, wind-, and wave-structure interaction. The stress time-history at an exemplarily selected critical point in an offshore wind energy monopile support structure is extracted from the model and translated into a VAL sequence, which can then be used as a loading sequence for the fatigue assessment or fatigue testing of welded joints of offshore wind turbine support structures. This study presents the approach to determine combined load spectra and standardized time series for wind, wave, and ice action.

show abstract

“…In this method, which is the simplest model for estimating the fatigue life under random loading, the root mean square values of the maximum and minimum stresses of the specimen are calculated and then, the Forman equation is used to estimate the fatigue life. Sumi and Inoue (2011) and Li et al (2015) analyzed the FCG under random loading in marine structures. In their studies, they used numerical and test methods and examined the effect of loading sequence on the specimen.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack growth reliability analysis under random loading

Salari

2019

IJSI

View full text Add to dashboard Cite

Purpose The purpose of this paper is to investigate the fatigue crack growth (FCG) under random loading using analytical methods. Design/methodology/approach For this purpose, two methods of cycle-by-cycle technique and central limit theorem (CLT) were used. The Walker equation was used to consider the stress ratio effect on the FCG rate. In order to validate the results in three random loading group with different loading levels and bandwidths, the results of the analysis, such as the mean lifetime of the specimen and the average crack length were compared with the test results in terms of the number of loading cycles. Findings The comparison indicated a good agreement between the results of the analysis and the test. Further, the diagrams of reliability and the probability of failure of the specimen were obtained for each loading group and were compared together. Originality/value Applying the cycle-by-cycle and CLT methods for the calculation of fatigue reliability of a CT specimen under random loading by the Walker equation and comparing their results with each other is not observed in other researches. Also in this study, the effect of the loading frequency bandwidth on lifetime was studied.

show abstract

An improved procedure for generating standardised load-time histories for marine structures

Cited by 6 publications

References 23 publications

Common Case Studies of Marine Structural Failures

Common Case Studies of Marine Structural Failures

Development of Combined Load Spectra for Offshore Structures Subjected to Wind, Wave, and Ice Loading

Fatigue crack growth reliability analysis under random loading

Contact Info

Product

Resources

About