Development of Simplified Structural Design Formulation for Slamming Loads

Sinha, Satyaranjan; Kar, Suman Kalyan; Sarangdhar, D. G.

doi:10.1115/omae2008-57740

Cited by 5 publications

(2 citation statements)

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“…Figure 21 shows a simplification of the slamming pressure. The peak pressure (P1) and its duration (t 1 ) can be used to determine the triangular shape of the impulse value, as described by [29]. The values of peak pressure and duration obtained from the free-drop experiments are shown in Table 8.…”

Section: Resultsmentioning

confidence: 99%

Experimental Study of Slamming Effects on Wedge and Cylindrical Surfaces

Seo

Shin

2020

Applied Sciences

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Slamming is a very significant phenomenon that occurs in marine structures operating under extreme conditions. Slamming significantly reduces the design life of floating offshore wind turbines, as well as marine structures, and causes structural damage. Thus, the slamming load should be considered sufficiently during the design phase of the structure, and the results of experiments of good quality should be incorporated. The phenomenon of slamming should be analyzed using peak pressure, width, duration, and dynamic loads that depend on the design and natural frequency of the structure. In the case of a slamming experiment, the deadrise angle shows the greatest pressure between 3° to 10°. In this study, pressure values were compared using a model with a deadrise angle of 10° and a cylinder model most commonly used for the fabrication and installation of offshore structures. The peak pressure of the cylindrical model is greater than those of the flat model and the wedge model with a 10° deadrise angle. Pressure and strain were measured using free drops from heights of 1.0 and 1.7 m from the water surface, and the elastic effects were studied accordingly. Also, the peak pressure due to a slamming impact occurs several times depending on the natural frequency of the structure. In order to understand the behavior of the structure against the elastic effect, the second peak in the experimental results was theoretically and experimentally analyzed. The second pressure peak is greater than the first pressure peak due to the elastic behavior effects based on the natural frequency of models used in the slamming test. Also, a single slamming results in several peak pressures and it greatly deteriorates the fatigue strength. Experiments and simulations were carried out to derive the effects of repeated slamming loads on the structure. In the structural design considering the slamming loads, information on the elastic effect of the structure and accumulated loads is very important. This can be an important variable in the design of the floater and can play an important role in assessing the impact on the floater. These results raise questions as to the extent that slamming pressures are replaced with equivalent hydrostatic pressures in most design rules of the recognized certification society.

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Section: Resultsmentioning

confidence: 99%

Experimental Study of Slamming Effects on Wedge and Cylindrical Surfaces

Seo

Shin

2020

Applied Sciences

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“…[30] were employed. The resulting f becomes decreased [30,31]. The detailed calculation can also be found in Truong et al [13].…”

Section: Load Characteristicsmentioning

confidence: 99%

Effects of material strain rate, impulse profile on damage evolution of steel plates subjected to repeated pressures

Huynh,

Dang,

Quach

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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This study deals with a numerical estimation of the damage evolution of steel plates used in ships and offshore structures due to repeated slamming-induced pressures. The numerical analysis model was developed using finite element ABAQUS software. Subsequently, the validated model was extended to investigate the effects of material strain rate and impulse profile on the damage evolution of plates having actual scantlings. Different strain rate models were used, and several types of impulse profiles that can be used to simplify the actual slamming pressure were adopted. In the simulation, the material strain hardening was defined for the plate model, and the impulsive pressures were applied uniformly over the plate while it was fully clamped at four edges. The results showed that a large effect of the material strain rate on the damage evolution of the plate was noticed for only several first impacts, while the effect of the impulse profile is remarkable for whole impact events. The occurrence of the pseudo-shakedown phenomenon of steel plates was examined accordingly. The results can be useful for the design of ships and offshore structures against slamming.

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2017

Handbook of Structural Life Assessment

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Development of Simplified Structural Design Formulation for Slamming Loads

Cited by 5 publications

References 0 publications

Experimental Study of Slamming Effects on Wedge and Cylindrical Surfaces

Experimental Study of Slamming Effects on Wedge and Cylindrical Surfaces

Effects of material strain rate, impulse profile on damage evolution of steel plates subjected to repeated pressures

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