Faculté des Sciences appliquées
Faculté des Sciences appliquées

Hull Girder Ultimate Strength of a Ship Using Nonlinear FE Method

Kalyanasundaram, Hemanand ULiège
Promotor(s) : Kaeding, Patrick ; Lindemann, Thomas ; Darie, Ionel
Date of defense : 2017 • Permalink :
Title : Hull Girder Ultimate Strength of a Ship Using Nonlinear FE Method
Author : Kalyanasundaram, Hemanand ULiège
Date of defense  : 2017
Advisor(s) : Kaeding, Patrick 
Lindemann, Thomas 
Darie, Ionel 
Committee's member(s) : Rigo, Philippe ULiège
Language : English
Number of pages : 78
Discipline(s) : Engineering, computing & technology > Civil engineering
Target public : Researchers
Professionals of domain
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master de spécialisation en construction navale
Faculty: Master thesis of the Faculté des Sciences appliquées


[en] Ultimate hull girder capacity of a ship is a vital aspect that ensures ships overall strength. Sea going vessels of length greater than 150 m has to be verified for its hull girder strength capacity as per DNV GL rules. Smith method, an iterative procedure is used to estimate the hull girder capacity of a ship, considering only vertical bending moment. Safety factors are considered to compensate uncertainties like material properties, imperfections and corrosion. But the assumption of vertical bending moment as critical loading, has to be reassessed when a vessel like ultra large container ship with large deck openings is estimated for ultimate strength.

Nonlinear finite element analysis is capable of producing more comprehensive results considering combined loading conditions which includes the effects of combined loadings (vertical, horizontal bending moments and shear forces, torsional moment, double bottom bending, and local loads) , nonlinearities and uncertainties (initial imperfections). Goal of this master thesis is to calculate the hull girder strength capacity of an ultra large container vessel loaded critically, under the influence of head sea and oblique sea loading cases using nonlinear FE method. It includes preparation of CAD and FE models, geometrical initial imperfection modeling, identifying critical moment condition through cargo hold FE analysis, generation of loadings and global FE analysis. Direct analysis results are compared with the generated loadings to ensure the hull girder strength.



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