Ship's hull response under extreme bending loading

Pollalis, Christos; Πολλάλης, Χρήστος

dc.contributor.author	Pollalis, Christos	en
dc.contributor.author	Πολλάλης, Χρήστος	el
dc.date.accessioned	2015-04-03T09:46:54Z
dc.date.available	2015-04-03T09:46:54Z
dc.date.issued	2015-04-03
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/40550
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.3678
dc.description	Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Υπολογιστική Μηχανική”	el
dc.rights	Default License
dc.subject	Finite element method, bending loading, ship hull, explicit algorithm	en
dc.title	Ship's hull response under extreme bending loading	en
heal.type	masterThesis
heal.classification	Naval Architecture	en
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2015-02
heal.abstract	In April 2013, IACS first introduced the Draft Harmonized Rules for Tankers and Bulk Carriers, where it is also mentioned the study of the residual strength of a ship’s hull after collision or grounding, including the proposed dimensions of a representative damage. In this thesis, the main part deals with this issue of ship’s residual strength in case of collision. In Draft Harmonized Rules either the iterative-incremental method or the finite element method is proposed for the assessment of the ultimate bending capacity of a transverse cross-section. In this work, we considered the sagging condition as the most severe in a ship’s lifetime. The reason is that, in general, the part of a ship above neutral axis is less stiff than the part beneath the neutral axis as the double bottom provides increased strength and thus it faces greater risks to collapse. Moreover, the deck of a ship is usually more remote from the neutral axis than the bottom. Therefore, the normal stresses which are developed at deck plating and stiffeners are larger and can lead to buckling collapse of the structure. We used the Finite Element Commercial package (ABAQUS Version 6.13-4) for our calculations. The models were simulated by applying explicit algorithm as deformations and rotations were quite large. In such cases, a static algorithm cannot be applied because the non-linear response of the structure is too complicated and convergence is difficult to be achieved. The second issue of interest in this thesis is to compare the numerical results to the results taken by the implementation of the incremental-iterative method.	en
heal.advisorName	Παπαδρακάκης, Εμμανουήλ	el
heal.committeeMemberName	Σαμουηλίδης, Εμμανουήλ	el
heal.committeeMemberName	Παπαδόπουλος, Βασίλειος	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυετεχνείο. Σχολή Χημικών Μηχανικών	el
heal.academicPublisherID	ntua
heal.numberOfPages	90 σ.	el
heal.fullTextAvailability	true