Effect of whipping stresses on the fatigue damage of ship structures

Fricke, Wolfgang; Paetzold, Hans

doi:10.1007/s40194-014-0111-5

Cited by 12 publications

(2 citation statements)

References 4 publications

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“…According to the data of [22], the slamming effect on fatigue strength of the junction between the frame and the double bottom structures was taken into account. In accordance with the latter, a simplified calculation of fatigue dam-age of the joint from wave loads taking into account superimposed high-frequency stresses, includes the following steps:…”

Section: The Results Of Calculation Of the Total Fatigue Damage Of The Studied Joints And Their Durabilitymentioning

confidence: 99%

Improvement of trawler hull structure under condition of ensuring fatigue strength

Korostylov

Lytvynenko

Sharun

et al. 2021

EEJET

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The structure of the hull of the project 1288 trawler in a region of fore hold was improved to ensure fatigue strength of assemblies of the intersection of main frames with the second bottom. To this end, a study of the fatigue strength of these assemblies was carried out for the original side structure and two versions of its modernization. Values of internal forces at the points of appearance of fatigue cracks in the compartment have been determined for three design versions of the side. It was found that the greatest forces act in the middle of the fore half of the compartment. Calculations of parameters of the long-term distribution of magnitudes of ranges of total equivalent operating stresses according to the Weibull law in the points of occurrence of fatigue cracks for different design versions of the side grillage have been performed. These parameters were determined for the middle of the fore hold of the vessel and for the areas in which maximum values of bending moment ranges are in effect with and without corrosive wear. Values of total fatigue damage and durability of the studied assemblies were determined. Calculations were carried out by nominal stress method, hot spot stress method, and experimental and theoretical method. It was shown that in order to ensure fatigue strength of the assembly under consideration, it is necessary to extend the intermediate frames of the original version of the side structure to the level of the second bottom fixing them to the deck. It is also necessary to attach a cargo platform to the side thus reducing the frame span. As a result, the level of fatigue damage over 25 years of operation will decrease by about 3.5 times. As it was found, approximate consideration of the slamming effect does not significantly increase the amount of fatigue damage to the assembly. The results of the development of recommendations for modernization of the side structure can be implemented both on ships of the 1288 project and on other ships with a transverse side framing system.

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Section: The Results Of Calculation Of the Total Fatigue Damage Of The Studied Joints And Their Durabilitymentioning

confidence: 99%

Improvement of trawler hull structure under condition of ensuring fatigue strength

Korostylov

Lytvynenko

Sharun

et al. 2021

EEJET

View full text Add to dashboard Cite

show abstract

“…Ren et al (2018) introduced a 3-D linear hydroelastic theory in frequency domain and 3-D nonlinear hydroelastic theory in time domain to estimate the influence factor of whipping on fatigue damage with different loading states. Fricke and Paetzold (2014) proposed a simplified consideration of the whipping stresses in fatigue analyses through full-scale measurements, and they obtained a significant increase of the fatigue damage caused by this phenomenon. Storhaug (2014) demonstrated by means of model tests and full scale measurements that whipping increases the fatigue damage and extreme loading considerably.…”

Section: Introductionmentioning

confidence: 99%