Low-cycle fatigue of ship hull damaged in collision

Gledić, Ivana; Parunov, Joško; Prebeg, Pero; Ćorak, Maro

doi:10.1016/j.engfailanal.2018.11.005

Cited by 21 publications

(14 citation statements)

References 11 publications

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“…The ship structure is made of mild steel (R eH = 235 N/mm 2 ), except for longitudinally effective deck and bottom structural elements, which are made of high-tensile steel (R eH = 315 N/mm 2 ). Damage scenarios used for modelling damage shapes are described in [5,6]. Damage scenarios are based on the historical database of ship damages and accidents.…”

Section: Modelling Of Damaged Ship Structurementioning

confidence: 99%

“…Recently, the low-cycle fatigue (LCF) failure mode of a ship damaged in a collision has been investigated [6]. The LCF corresponds to the scenario where a ship encounters large wave amplitudes during the salvage, causing cyclic plasticity in some parts of the damaged hull structure.…”

Section: Introductionmentioning

confidence: 99%

“…The aim of the present study is to propose the method for the fatigue crack propagation in ship damaged in collision during salvage. The present study is built upon previous research, where damage shape and size are modelled nearly realistic, taking bow shape and penetration depth of the striking ship into account [5,6]. Stress intensity factor (SIF) across the main deck of the struck ship, the most important parameter in crack propagation analysis, is determined numerically using Displacement Method and by using an expression based on the experiments of crack propagation in the stiffened panel [10].…”

Section: Introductionmentioning

confidence: 99%

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Improvement of the Ship Emergency Response Procedure in Case of Collision Accident Considering Crack Propagation during Salvage Period

Gledić

Mikulić

Parunov

2021

JMSE

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Specialized procedures to help in the emergency response situations following ship accidents have been under development by the Classification Societies. Such procedures consider the hull-girder collapse as the most important failure mode, without the possibility of crack propagation caused by fluctuating wave loads. In the present study, the fatigue crack propagation in the main deck of the oil tanker damaged in collision during salvage is investigated. The shape and size of the damage are modelled using the realistic bow shape of the striking ship and historical data of ship accidents. The stress intensity factor (SIF) across the main deck of the struck ship is calculated numerically and by the method based on the available experimental results of the crack propagation in the stiffened panel. Fluctuating wave–induced stresses in short-term sea conditions during salvage are obtained by Monte Carlo simulation (MC) based on Rayleigh distribution. Cycle-by-cycle crack propagation is calculated using Paris law. Many salvage simulations are performed to cover different possible time-histories of the fatigue loading. Results of the analysis are presented as histogram of the crack increase during salvage. Parametric analysis is performed to investigate the influence of the sea state severity, initial crack size, and towing duration on the final crack size. The proposed procedure can be considered as a part of a software tool for emergency response action during salvage of damaged ship.

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Section: Modelling Of Damaged Ship Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improvement of the Ship Emergency Response Procedure in Case of Collision Accident Considering Crack Propagation during Salvage Period

Gledić

Mikulić

Parunov

2021

JMSE

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“…Gledić et al 21 investigated the possibility of crack initiation in damaged ship structure during salvage period. Hypothesis was that low-cycle wave loading could cause high-amplitude fluctuating stresses at the edge of damage opening.…”

Section: Literature Reviewmentioning

confidence: 99%

Efficient fatigue assessment of the upper and lower hopper knuckle connections of an oil tanker

Özgüç

2020

Proceedings of the Institution of Mechanical Engineers, Part M:

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The fatigue of structural details of ships is of great importance in the maritime industry as they can lead to cracks which can jeopardize structural integrity. The hopper knuckle is among the most vulnerable areas in a ship with respect to fatigue damage. Analysis of the hopper knuckle has become mandatory for tankers in the Class Ship Rules and in the International Association of Classification Societies Common Structural Rules. Along with the fatigue damage record of the vessels, the fatigue analysis of the hopper knuckles is essential to ensure that the vessels have sufficient fatigue strength. In the current work, fatigue calculations are performed of the upper and lower hopper knuckle connections within midship of the oil tanker using simplified fatigue calculations based on Det Norske Veritas (DNVGL) Classification Note No. 30.7. The fatigue analysis is based on 25 years of operation in worldwide wave environment. A cargo hold model (½ + 1 + ½) amidships and a local finite element model of the hopper knuckle are generated. The local model provides relevant hotspot stress for fatigue life calculations. The results from the hopper knuckle fatigue analysis show that the vessels may expect fatigue cracks at lower hopper knuckle before the vessel reaches its design life of 25 years. Based on the findings, it is recommended to fit soft brackets and close scallops at the lower hopper knuckle on selected common frames in all cargo holds.

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“…However, most mechanical applications imply more complex scenarios, real service loads are usually variable and designs include complex profile shapes instead of just flat or cylindrical surfaces. As a consequence, different stresses/strain distributions appear on the real structures subjected to cyclic loads [2][3][4]. For characterising such complex scenarios there exists more sophisticated methods such as the critical plane approaches as an alternative to the classical models [5].…”

Section: Introductionmentioning

confidence: 99%

On the Behaviour of 316 and 304 Stainless Steel under Multiaxial Fatigue Loading: Application of the Critical Plane Approach

Cruces

López-Crespo

Bressan

et al. 2019

Metals

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In this work, the multiaxial fatigue behaviour of 316 and 304 stainless steel was studied. The study was based on the critical plane approach which is based on observations that cracks tend to nucleate and grow in specific planes. Three different critical plane models were employed to this end, namely Fatemi–Socie (FS), Smith–Watson–Topper (SWT) and the newly proposed Sandip–Kallmeyer–Smith (SKS) model. The study allowed equi-biaxial stress state, mean strain and non–proportional hardening effects to be taken into consideration. Experimental tests including different combinations of tension, torsion and inner pressure were performed and were useful to identify the predominant failure mode for the two materials. The results also showed that the SKS damage parameter returned more conservative results than FS with lower scatter level in both materials, with prediction values between FS and SWT.

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Low-cycle fatigue of ship hull damaged in collision

Cited by 21 publications

References 11 publications

Improvement of the Ship Emergency Response Procedure in Case of Collision Accident Considering Crack Propagation during Salvage Period

Improvement of the Ship Emergency Response Procedure in Case of Collision Accident Considering Crack Propagation during Salvage Period

Efficient fatigue assessment of the upper and lower hopper knuckle connections of an oil tanker

On the Behaviour of 316 and 304 Stainless Steel under Multiaxial Fatigue Loading: Application of the Critical Plane Approach

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