Ultimate strength of cracked ship structural elements and systems: A review

Babazadeh, Ashkan; Khedmati, Mohammad Reza

doi:10.1016/j.engfailanal.2018.03.003

Cited by 20 publications

(7 citation statements)

References 31 publications

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“…This is obvious because, for a long crack, the structural capacity is severely reduced where it is a transversely oriented crack and slightly reduced when it is a longitudinally oriented crack. Similar observations can be found in [8,22]. What is interesting is that the impact of the initial imperfections level is smaller itself in comparison to its interaction with other factors.…”

Section: Doe Modelsupporting

confidence: 80%

“…The variables x 1 , x 2 and x 5 will be the same as presented in Eqs. ( 7), (8), and (11), respectively. The estimated ultimate capacity for the intact plate is equal to: intact = 0.875 + 0.06765x 1 -0.1206x 2 -0.03202x 5 + + 0.04163x 1 x 5 + 0.03598x 2 x 5…”

Section: Intact Platementioning

confidence: 99%

“…A quite comprehensive review related to the ultimate strength of cracked ship structural elements was presented in [8]. A limited number of experimental studies were conducted with regard to cracked plates [7,9] and cracked stiffened plates [10].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Ultimate Compressive Strength of Cracked Plates with the Use of DoE Techniques

Woloszyk

Garbatov²

2020

Polish Maritime Research

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The objective of this work is to investigate the structural compressive response of plates with locked cracks accounting for all relevant factors and correlation between them. The nonlinear FE model considering both geometric and material nonlinearities is employed herein, and the FE model of the structural response of intact plates is validated with the available experimental data. In the common studies, based on One Factor at a Time analysis, some of the parameters and interactions between them are excluded. In the present study, the numerical investigations are conducted with the use of the Design of Experiments techniques, where all essential parameters and their interactions are adequately considered. With a total of 32 numerical analyses, the most influential factors and their interactions are identified. As a study outcome, empirical formulations, which allow for a fast estimation of the ultimate compressive strength of intact plates, plates with locked cracks, and repaired cracked plates, are derived. The developed formulations represent a fast and practical tool for estimating the ultimate compressive strength of intact, cracked, and repaired plates, which can be easily employed in the reliability analysis.results followed by their discussion.

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Section: Doe Modelsupporting

confidence: 80%

Section: Intact Platementioning

confidence: 99%

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Analysis of Ultimate Compressive Strength of Cracked Plates with the Use of DoE Techniques

Woloszyk

Garbatov²

2020

Polish Maritime Research

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“…The review of the ultimate strength of cracked structural elements in ships was carried out in [23], showing examples of experimental studies with regards to plates [22], [24] and stiffened plates [25]. Much greater attention was paid to numerical studies [26]- [29].…”

Section: Introductionmentioning

confidence: 99%

Ultimate Compressive Strength Assessment of Uncleaned and Cleaned Corroded Plates with Locked Crack

Woloszyk

Garbatov

2021

Polish Maritime Research

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The work presented here investigates the structural response of cleaned corroded plates, subjected to compressive load in the presence of a locked crack, where the change of mechanical properties as a result of corrosion development and the cleaning process is also accounted for. A Finite Element model for assessing the compressive strength, considering geometric and material nonlinearities, is developed, and the analysed plates are compared with the available experimental data. An experimental design plan is generated using the Design of Experiments techniques, which quantifies the influence of the governing variables and their interactions with respect to the plate’s ultimate compressive strength. With a limited number of observations, the most significant effects are identified. The corrosion degradation is revealed to be the most crucial effect leading to an effective strength reduction. It was found that, in the case of a corroded plate with a locked crack subjected to a compressive load, the most severe case is when the crack is transversely oriented. The strength reduction is slightly lower than when the corrosion degradation and the presence of a crack are considered to be a simple summation of these two effects but acting separately. The outcome of the analysis is the development of several empirical formulations that allow a fast estimation of the ultimate strength of a corroded plate, subjected to compressive load in the presence of a locked crack, accounting for different cleaning.

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“…They have examined how these parameters affect plate behavior. As a result of a study on the final strength of fractured plates and the results of research in this area, the fracture length it is understood that it had the most important effect on the final strength of the plates [13]. At the same time, since the fracturing orientation changes in the longitudinal direction (perpendicular to the loading) in the transverse direction, the impact of the fracture on the highest strength of the plates becomes negligible [14].…”

Section: Introductionmentioning

confidence: 99%

Malfunction crack failure in hydrodynamically lubricated bearings: A Case Study Hydraulic Turbine

Kahraman

Authorea

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This study investigates the trunnion crack of a 50 MW hydraulic turbine in the generator guide bearing. The crack area has been examined metallographically and the fixing method for the the trunnion crack has been explained. Result of the study shows that the reason for the formation of the bearing trunnion crack can be the thermal stresses that occur during the mounting of the bearing trunnion to the turbine shaft and the material fatigue that occurs during the operation of the hydraulic turbine.

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Ultimate strength of cracked ship structural elements and systems: A review

Cited by 20 publications

References 31 publications

Analysis of Ultimate Compressive Strength of Cracked Plates with the Use of DoE Techniques

Analysis of Ultimate Compressive Strength of Cracked Plates with the Use of DoE Techniques

Ultimate Compressive Strength Assessment of Uncleaned and Cleaned Corroded Plates with Locked Crack

Malfunction crack failure in hydrodynamically lubricated bearings: A Case Study Hydraulic Turbine

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