Analysis of ship head-on collisions

Nikomanis, Angelos; Νικομάνης, Άγγελος

dc.contributor.author	Nikomanis, Angelos	en
dc.contributor.author	Νικομάνης, Άγγελος	el
dc.date.accessioned	2023-11-13T09:46:53Z
dc.date.available	2023-11-13T09:46:53Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/58286
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.25982
dc.rights	Αναφορά Δημιουργού 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/gr/	*
dc.subject	Πεπερασμένα Στοιχεία	el
dc.subject	Προσομοίωση συγκρούσεων	el
dc.subject	Συγκρούσεις Πλοίων	el
dc.subject	Ανάλυση Ατυχημάτων Πλοίων	el
dc.subject	Μετωπική Σύγκρουση	el
dc.subject	Finite Elements	en
dc.subject	Collision Simulation	en
dc.subject	Ship collisions	en
dc.subject	Accidental Limit State	en
dc.subject	Head-On collision	en
dc.title	Analysis of ship head-on collisions	en
heal.type	bachelorThesis
heal.classification	Finite Element Analysis	en
heal.classification	Ship Collisions	en
heal.classification	Structural Analysis	en
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2023-07-12
heal.abstract	Head-on collisions are a frequently-observed category of ship accidents, despite the accumulated navigational experience and equipment available to prevent them. The collision bulkhead is fundamental for containing the damage extent, following such accidents. However, the need to accurately assess bow responses during head-on collisions is inextricably linked to design of offshore installations, such as bridge piers and gravity platforms. In the present study, the bow response of a Panamax Bulk Carrier, bearing a blunt bulbous bow, during a head-on collision accident is simulated, using Finite Element Analysis with Abaqus/CAE. Following design of the bow geometry, the material behavior is modelled using state-of-the-art techniques. Three mesh sizes are constructed, for a mesh convergence study. The subsequent results reveal that a mesh size in the order of 3t is a suitable choice for the simulation of head-on collisions with Finite Elements. Followingly, comprehensive results and damage descriptions are presented, for three separate cases of initial collision speed (V = 3kn, V = 6 kn and V = 9 kn), until dissipation of kinetic energy. The results identify the areas of excessive plastic strains on the bow model, and predict the formation of folds during crushing. The limitation of damage propagation to strictly fore of the collision bulkhead is observed, and the validity of the assumption of static bow crushing is examined. A study on the relative bulb/stem contribution to the total bow strength reveals contributions of the bulb in the order of 80%, identifying it as the primary structural member resisting the bow deformation. The present study’s results are compared against various simplified analytical techniques for bow crushing analysis, whilst the deformation patterns exhibited are compared against several actual incidents; good agreement is observed, indicating the accuracy of the FEA modelling techniques employed.	en
heal.advisorName	Μανόλης, Σαμουηλίδης	el
heal.advisorName	Manolis, Samuelides	en
heal.committeeMemberName	Ανυφαντής, Κωνσταντίνος	el
heal.committeeMemberName	Anyfantis, Konstantinos	en
heal.committeeMemberName	Βεντίκος, Νικόλαος	el
heal.committeeMemberName	Ventikos, Nikolaos	en
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Ναυπηγών Μηχανολόγων Μηχανικών. Τομέας Θαλάσσιων Κατασκευών. Εργαστήριο Ναυπηγικής Τεχνολογίας	el
heal.academicPublisherID	ntua
heal.numberOfPages	126 σ.	el
heal.fullTextAvailability	false