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Hydro-plastic slamming
Published in J. Parunov, C. Guedes Soares, Trends in the Analysis and Design of Marine Structures, 2019
Water impacts are known to occur for ships and offshore structures at sea due to the relative motion between the liquid and the structure. Example scenarios leading to slamming are water entry and exit of ship bow and stern, offshore platforms subjected to steep breaking waves, high speed vessels travelling in waves and free-falling life boats. Structures subjected to impulsive loads from water slamming, may respond in the elastic or elastoplastic regimes depending on the load intensity. There can be significant coupling effect between water pressure and the structural response, termed as hydroelasticity and hydro-elastoplasticity, respectively. Hydroe-lastic slamming has been studied extensively, for instance by Faltinsen (2000), Kvalsvold & Faltinsen (1995), Bishop & Price (1979) and Qin & Batra (2009), but similar attention has not been given to the hydro-elastoplastic or hydro-plastic slamming. In practice, offshore structures may be impacted by steep and energetic waves in extreme sea states, causing significant structural damage. For example, the accident of the offshore drilling rig COSL Innovator in the North Sea in 2015 led to one death and extensive damage to the cabins after being struck by an energetic horizontal wave. In order to maintain structural safety and to prevent such accidents, rules and standards should be established for designing against extreme slamming loads.
Recent developments on the water entry impact of wedges and projectiles
Published in Ships and Offshore Structures, 2022
Ahmad Zamir Chaudhry, Yao Shi, Guang Pan
Numerous factors contribute in the slamming phenomenon including vehicle profile, the relative motion between structure and water, hydroelasticity of structure, surface profile of water, air bubbles, cushioning effect and many others. Hydroelasticity is a phenomenon which occurs when a deformable body interacts with the free water surface. It can modify the fluid flow due to the structural deformations and can change the predicted hydrodynamic forces relative to a rigid body. It is challenging to consider all the aspects in one model which makes the slamming process to be more complex.