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A study on accumulated damage of steel wedges with dead-rise 10° due to slamming loads
Seo, Byoungcheon,Truong, Dac Dung,Cho, Sangrai,Kim, Dongju,Park, Sookeun,Shin, Hyunkyoung The Society of Naval Architects of Korea 2018 International Journal of Naval Architecture and Oc Vol.10 No.4
This paper presents the results of experimental investigation on the elastic-plastic response of steel unstiffened wedges with dead-rise $10^{\circ}$ subjected to repeated impulsive pressure loadings. Repeated drop tests were performed with both wedge thickness and drop height varied. The pressure and histories were recorded during the tests and the permanent deflections were measured after every drop. Using the recorded test result, the effects of flexibility of wedges and repetition have been investigated. From the pressure history obtained from the tests the characteristics of the impulses were identified. Numerical simulations of the tests were made using the measured pressure history and the permanent deflection predictions were compared with those of the experiments.
A study on accumulated damage of steel wedges with dead-rise 10 due to slamming loads
Byoungcheon Seo,Dac Dung Truong,Sang-Rai Cho,Dongju Kim,Sookeun Park,Hyun Kyoung Shin 대한조선학회 2018 International Journal of Naval Architecture and Oc Vol.10 No.4
This paper presents the results of experimental investigation on the elasticeplastic response of steel unstiffened wedges with dead-rise 10 subjected to repeated impulsive pressure loadings. Repeated drop tests were performed with both wedge thickness and drop height varied. The pressure and histories were recorded during the tests and the permanent deflections were measured after every drop. Using the recorded test result, the effects of flexibility of wedges and repetition have been investigated. From the pressure history obtained from the tests the characteristics of the impulses were identified. Numerical simulations of the tests were made using the measured pressure history and the permanent deflection predictions were compared with those of the experiments.
서병천(Byoungcheon Seo),김재훈(Jaehun Kim),신재완(Jaewan Shin),채상훈(Sanghun Chae),T.D.Pham,신현경(Hyunkyoung Shin) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
When ships are sailing with large motions in rough waves, the slamming phenomenon happens and their bow, bottom, and flare suffer from impulsive pressure loadings. The reinforcing of ship structures has been determined by the equivalent static pressure recommended in the rule book of classification societies to prevent structural damages. However, ship's damages due to slamming are still reported and it should be required that characteristics of impulsive pressure loadings be investigated more carefully to improve the design guidance. In this study, the effects of elasticity on slamming loads are investigated by results from free drop tests of several wedges which are made of wood or steel.
서병천(Byoungcheon Seo),김재훈(Jaehun Kim),신재완(Jaewan Shin),신현경(Hyunkyoung Shin) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.11
Most offshore structures including offshore wind turbines and ships, etc. suffer from the impulsive pressure loads in rough waves. Effects of elasticity on such slamming loads are investigated through results from free drop tests of several wedges which is made of steel. The cumulative deformation by consecutive free drops from 1,500mm in height is measured in the water tank.
Experimental investigation of slamming impact acted on flat bottom bodies and cumulative damage
Shin, Hyunkyoung,Seo, Byoungcheon,Cho, Sang-Rai The Society of Naval Architects of Korea 2018 International Journal of Naval Architecture and Oc Vol.10 No.3
Most offshore structures including offshore wind turbines, ships, etc. suffer from the impulsive pressure loads due to slamming phenomena in rough waves. The effects of elasticity & plasticity on such slamming loads are investigated through wet free drop test results of several steel unstiffened flat bottom bodies in the rectangular water tank. Also, their cumulative deformations by consecutively repetitive free drops from 1000 mm to 2000 mm in height are measured.