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Numerical Investigations on ultimate Strength of a double hull VLCC under combined loads and initial imperfections

Lindemann, Thomas and Opeke, Bright Ebikemefa and La Ferlita, Alessandro and Mühmer, Markus and Kaeding, Patrick (2022) Numerical Investigations on ultimate Strength of a double hull VLCC under combined loads and initial imperfections. In: ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2019, 41. 41st International Conference on Ocean, Offshore and Arctic Engineering, 5.-10. Juni 2022, Hamburg, Deutschland.

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Abstract

Nonlinear finite element analyses are performed to determine the ultimate strength of a double hull VLCC under pure vertical, horizontal and biaxial bending. A parametric finite element model is developed and the influence of nonlinear material behavior, mesh size and model length on the hull girder ultimate strength is demonstrated exemplarily for hogging and sagging conditions. An appropriate parameter configuration with respect to numerical efforts and accuracy is used to perform static implicit analyses for horizontal bending and biaxial load cases. Convergence is reached by using the full Newton-Raphson scheme - an incremental iterative solution approach. The results are validated against the well-established Smith method. Due to welding, initial deflections and residual stresses are produced. For the proposed finite element model initial deflections of plating and stiffeners have been considered. Furthermore, the influence of welding residual stresses on the ultimate hull girder strength is demonstrated for the different load cases. Nonlinear finite element analyses are also performed to determine the residual strength of the damaged double hull VLCC under combined loads. Different symmetric grounding damages are implemented by removing structural components of the model. Expectedly, the results show that the ultimate strength of the structure decreases as the damage extent increases.

Item URL in elib:https://elib.dlr.de/185572/
Document Type:Conference or Workshop Item (Speech)
Title:Numerical Investigations on ultimate Strength of a double hull VLCC under combined loads and initial imperfections
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lindemann, Thomasthomas.lindemann (at) uni-rostock.deUNSPECIFIED
Opeke, Bright Ebikemefabright.okpeke (at) dlr.deUNSPECIFIED
La Ferlita, Alessandroalaferlita (at) eagle.orgUNSPECIFIED
Mühmer, MarkusMarkus.Muehmer (at) dlr.dehttps://orcid.org/0000-0003-4621-6870
Kaeding, Patrickpatrick.kaeding (at) uni-rostock.deUNSPECIFIED
Date:2022
Journal or Publication Title:ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2019
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:41
Status:Published
Keywords:Ultimate strength, nonlinear finite element anaylsis, Smith's method, damage case, welding residula stress, bending
Event Title:41st International Conference on Ocean, Offshore and Arctic Engineering
Event Location:Hamburg, Deutschland
Event Type:international Conference
Event Dates:5.-10. Juni 2022
Organizer:ASME
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Electrochemical Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Storage
Location: Geesthacht
Institutes and Institutions:Institute of Maritime Energy Systems > Department Energy Converters and Systems
Deposited By: Mühmer, Markus
Deposited On:27 Jun 2022 07:38
Last Modified:27 Jun 2022 07:38

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