Fatigue assessment of ship structures

Cramer, Espen H.; Løseth, Robert; Olaisen, Kjell

doi:10.1016/0951-8339(94)00026-o

Cited by 60 publications

(7 citation statements)

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“…Studies show that FSW produces less distortion and better fatigue performance than submerged arc welding (SAW) [20]. A36-GL [21] and DH36 [22] steels welded by FSW reached fatigue strength values significantly above design recommendations [1,2]. A similar effect was observed for high-quality fusion welds [23,24].…”

Section: Introductionmentioning

confidence: 75%

“…These combine high strength with relatively good toughness and could be used in a wide range of industrial applications to achieve weight reduction without compromising load-bearing capacity. Yet, due to the limited knowledge on their fatigue resistance, current design rules prevent taking full advantage of the benefits these HSS can provide to welded structural applications [1,2].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and fatigue properties of friction stir welded high-strength steel plates

Sorger

Lehtimäki

Hurme

et al. 2018

Science and Technology of Welding and Joining

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The weldability of high-strength steels (HSSs) is limited by their loss of strength, toughness and fatigue properties. In demanding applications, the fatigue properties of welds are among the strictest requirements. This paper presents a weldability analysis focusing on the microstructure and fatigue properties of 6 mm thick S690 and S355 HSS plates joined by friction stir welding. Their fatigue properties are compared to design recommendations and to fatigue properties obtained with other welding techniques. Results show that the high-quality friction stir welded steel joints outperform high-quality arc welds and FAT80 design recommendations. The fatigue strength of the friction stir welded joints is increased with material yield strength. The mechanisms governing crack initiation at different maximum stress levels are discussed. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Microstructure and fatigue properties of friction stir welded high-strength steel plates

Sorger

Lehtimäki

Hurme

et al. 2018

Science and Technology of Welding and Joining

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“…Over time, this may lead to the development of cracks which may grow and cause structural fracture, leakage and may ultimately lead to structural collapse [1]. In order to control the risk of fatigue damages, fatigue assessment of ship structures are carried out during the design phase [2], and structural monitoring may be performed during operations [3], see also [4]. By comparing fatigue rates calculated by numerical models with measured fatigue rates from hull monitoring systems, one may correct for possible biases and account for uncertainties in the numerical calculations.…”

Section: Introductionmentioning

confidence: 99%

Statistical Modelling and Comparison of Model-Based Fatigue Calculations and Hull Monitoring Data for Container Vessels

Vanem

Aarsnes

Storhaug

et al. 2020

Lecture Notes in Civil Engineering

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This paper presents the results of statistical analyses on the difference between measured and calculated fatigue rates for an oceangoing container vessel. Data from a hull monitoring system installed onboard this ship provides time-series of observed fatigue rates in actual operation, sea-and weather conditions. In addition, a hydrodynamic model has been used to calculate fatigue rates for selected locations in the mid-ship section due to vertical bending moment only, corresponding to experienced weather conditions over the same time period. The measured fatigue rates are then compared to the calculated fatigue rates and statistical regression models are established to explain the differences as a function of selected explanatory variables. This can then be used to correct for biases in the numerical models. Overall, the results indicate that the models perform reasonably well and are able to describe much of the variation in the difference. However, the models are found to not generalize very well and it may be challenging to find models for a whole fleet of ships.

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“…Generally, the fatigue failure process can be divided into three stages: the initiation of cracks, stable growth of cracks, and fracture (Cramer et al, 1995). There are also different reasons for fatigue failure and the destruction of the total or local intensity.…”

Section: Introductionmentioning

confidence: 99%