Common Case Studies of Marine Structural Failures

Vukelić, Goran; Vizentin, Goran

doi:10.5772/intechopen.72789

Cited by 8 publications

(5 citation statements)

References 37 publications

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“…Conversely, Opening 3 exhibited a notably different stress distribution pattern, as the concentration of stress appeared to be more evenly spread across the bottom of the opening instead of being localized at a single point around 504.14 MPa, Figure 13. This dispersed stress concentration, while not concentrated in a specific region, still carried the potential to induce failure within that particular area [21], as evidenced by the findings of this study. In addition to the stress concentration effects induced by the openings, it is essential to acknowledge the influence of welding on the joint connecting the stiffener to the plate, as this factor also plays a role in shaping the overall strength and structural behavior of the ship.…”

Section: Discussionsupporting

confidence: 57%

Numerical Analysis of Openings in Stiffeners under Impact Loading: Investigating Structural Response and Failure Behavior

Ridwan,

Sudarno,

Nubli

et al. 2023

Mekanika: Majalah Ilmiah Mekanika

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<span lang="EN-US">As the demand for lightweight ships continues to rise, there is a growing necessity to explore innovative methods that can reduce the weight of ship structures without altering the materials used. This research addresses this challenge by investigating the effect of opening in stiffener under impact loading. The research aims to provide valuable insights into optimizing weight reduction strategies while ensuring the ship's overall strength and performance remain uncompromised. To achieve this goal, the study employed the finite element method as a solver. By simulating impact scenarios and analyzing stiffener responses, the numerical analysis quantified the structural behavior and failure modes. The focus was on understanding the impact of openings on the structural integrity and how it relates to their positioning relative to the impact point. The results of the study indicate that opening slightly distant from the impact point exhibit greater strength, showcasing a counterintuitive relationship between opening placement and structural response.</span>

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Section: Discussionsupporting

confidence: 57%

Numerical Analysis of Openings in Stiffeners under Impact Loading: Investigating Structural Response and Failure Behavior

Ridwan,

Sudarno,

Nubli

et al. 2023

Mekanika: Majalah Ilmiah Mekanika

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“…Laser vibrometry allows carrying out measurements using a laser beam [ 26 , 27 , 31 , 46 ]. It enables measurements of vibrations in a non-contact and non-invasive way.…”

Section: Methodsmentioning

confidence: 99%

“…SHM systems use a number of advanced sensors, such as fiber Bragg grating (FBG) sensors [ 21 , 22 , 23 , 24 ]. There are also works connected with the application of laser vibrometers in SHM application [ 8 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ], but authors have not found any information about the use of such sensors onboard ships.…”

Section: Introductionmentioning

confidence: 99%

Application of Laser Vibrometry to Assess Defects in Ship Hull’s Welded Joints’ Technical Condition

Szeleziński

Muc

Murawski

et al. 2021

Sensors

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The paper presents the measurement process and test results for six thin-walled plates with different dynamic characteristics caused by different defects of welded joints. The tests were carried out using non-destructive testing (NDT). The authors made an attempt to determine the validity of the use and degree of effectiveness of the tests based on laser vibrometry in detecting defects in welded joints. The tests of welded plates were carried out using displacement laser sensors and piezoelectric accelerometers, while the source of vibration extortion was a modal hammer. In the adopted measurement methodology, the application of accelerometers was to obtain the reference data, which allowed for comparison with the measurement data obtained from the laser vibrometer. The analysis of the obtained measurement data, in the fields of time and frequency, made it possible to verify the correctness of the data obtained by means of laser vibrometry and to determine the requirements which are necessary for the correct performance of NDT tests and in the future structural health monitoring (SHM) system of welded joints with the use of a laser vibrometer. The mathematical model developed in the MSC software Pastran-Nastran was also used in the work. The model was developed for the purpose of mutual verification of the measurement and calculation tests. At the present stage of work, it can be stated that the results obtained by laser vibrometry methods should be treated as a supplement to the research conducted with traditional piezoelectric accelerometers. In certain situations, they can be used as an alternative to accelerometers, due to the fact that laser sensors do not require direct contact with the examined object. Where the object under test may be in a strong electromagnetic field, optical sensors are better suited than contact sensors.

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“…Various factors of structural failure can cause damage to the ship so that it can affect operations [3]. Marine structures must comply with the design requirements in such a way that the probability of failure can be reduced to a minimum [4] . In addition, the strength of the structure of the ship or marine structure affects the durability of the structure itself.…”

Section: Introductionmentioning

confidence: 99%

Strength Analysis of the Deck Crane Barge Using the Finite Element Method

Abdullah¹,

Sumardiono²,

Soeroso³

2023

Proceedings of the 1st International Conference on Sustainable Engineering Development and Technological Innovation, ICSEDTI 20

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Barge is one type of ship that is widely used to transport various cargoes. One type of barge is a deck crane barge, barges with shear leg cranes or full rotating cranes. In the construction design, it is necessary to calculate the strength to avoid construction failure. One of the methods used to construction calculations is the finite element method. The finite element method is one of the most widely used numerical methods for engineering calculations. In this study, the strength of the deck crane barge was calculated using the finite element method. SHELL181 and BEAM189 elements were used in this study to simplified the modelling. The results of modeling with the finite element method produce that the maximum stress occurs at the connection between the bulkhead girder and the transverse frame (bracket), at Node 625. The construction strength of the deck crane barge model with a crane capacity of 250 tons (model 1) below the permissible stress, the value is 151.01 MPa. And the stress of the deck crane barge with a crane capacity of 350 tons (model 2) is 190.92 MPa, the stress exceeds the permessible stress.

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Common Case Studies of Marine Structural Failures

Cited by 8 publications

References 37 publications

Numerical Analysis of Openings in Stiffeners under Impact Loading: Investigating Structural Response and Failure Behavior

Numerical Analysis of Openings in Stiffeners under Impact Loading: Investigating Structural Response and Failure Behavior

Application of Laser Vibrometry to Assess Defects in Ship Hull’s Welded Joints’ Technical Condition

Strength Analysis of the Deck Crane Barge Using the Finite Element Method

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