Study & comparison of classification societies’ rules and regulations on metallic materials, composite materials & design loads of small crafts

Μπαρδούτσος, Άγγελος; Bardoutsos, Angelos

dc.contributor.author	Μπαρδούτσος, Άγγελος	el
dc.contributor.author	Bardoutsos, Angelos	en
dc.date.accessioned	2021-09-13T10:00:34Z
dc.date.available	2021-09-13T10:00:34Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/53838
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.21536
dc.rights	Default License
dc.subject	Σύνθετα υλικά	el
dc.subject	Μεταλλικά υλικά	el
dc.subject	Πιέσεις σχεδίασης	el
dc.subject	Μικρά σκάφη	el
dc.subject	Κανονισμοί	el
dc.subject	Composite materials	en
dc.subject	Metallic materials	en
dc.subject	Design loads	el
dc.subject	Small crafts	el
dc.subject	Requirements	el
dc.subject	Rules	el
dc.title	Study & comparison of classification societies’ rules and regulations on metallic materials, composite materials & design loads of small crafts	en
dc.title	Μελέτη και σύγκριση κανονισμών νηογνωμόνων για μεταλλικά υλικά, σύνθετα υλικά και πιέσεις σχεδίασης μικρών σκαφών	el
heal.type	bachelorThesis
heal.classification	ΤΟΜΕΑΣ ΘΑΛΑΣΣΙΩΝ ΚΑΤΑΣΚΕΥΩΝ	el
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2020-07-23
heal.abstract	The scope of this thesis is to lay the foundations of an extended study on the field of the ship structures, in terms of evaluating the quality of metallic and composite materials and of estimating loading on small crafts. To achieve this, the rules and regulations of five IACS classification societies have been collected in order to be primarily compared. The classification societies, of which rules are going to be inspected, are ABS, BV, DNV-GL, LR and RINA. The secondary purpose that this thesis serves, is for it to work as a consultative guide to any designer of small crafts or even a shipbuilder. Since the market of high-speed craft is in growth, a collection of the rules and regulations of five major classification societies would be a great tool to the naval architect. It would help to choose the class of the shell envelope materials, whether they are metallic (steels or aluminum) or composite (FRP) materials. Also, in conjunction with rules referring to the design loads, it would assist the designer to predict the pressures that are going to act on primary and secondary stiffening elements, thus help them determine their thicknesses. Small crafts used to get made mostly with metallic materials, steels and aluminium but over 30 years composite materials have been widely used in naval shipbuilding. The classification societies’ requirements to be examined refer to those materials due to their utility and market significance. The type of craft whose rules on design loads are going to be compared are the High-Speed Crafts and Yachts. Intention for this choice is to pick a type of craft that is extensively used, for passenger and cargo services, and a type of crafts that can be built to use sails as its primary means of propulsion. In the first chapter the rules on metallic materials as given by ABS, BV, DNV-GL, LR and RINA are collocated. The rules that mainly define the quality of the product to wit, those referring to chemical composition, mechanical properties and testing procedures are presented. The classification societies are tested for discrepancies among them, variety of classified grade of materials, quality of classified materials and completeness of their rules. The next chapter is arranged in a similar fashion and its topic is composite materials, specifically fibre reinforced materials. Firstly, each constituent material’s mechanical properties, as regulated by the classification societies, are compared separately. Then a calculative comparison is arranged in order to examine the differences on the mechanical properties of a combined laminate form. The design loads under survey, of the last chapter, are the ones that each classification society suggests that is necessary to be considered. Of course, several locations that are of major importance for a craft’s strength and are specially referred by all the societies are particularly set side by side, while a segment, containing the various regions of the craft that each society forecasts, is also included. Due to its importance on design pressures of High-Speed Crafts and Yachts, the vertical acceleration requirements are discussed at the start of the third chapter. Parallel to the chapter’s topic an example application of the rules on a hypothetical high-speed craft is carried out, to have a practical view on the matter. To summarize, the conclusions refer to the attributes that each classification society has shown and the characteristics that may slightly distinguish them from the rest. In terms of materials, the societies will be evaluated for the variety of classified products, the quality of those and the competency of their rules. Considering design loads, conclusions will be drawn through the calculations of a rule application example. Those calculations will help to set a primary comparison among the rules of the societies, as of which one’s estimations result to greater values. Moreover it is investigated whether the answer to which society forecasts greater loading is affected by the vertical or the longitudinal position of the load point considered. For example: would the classification society, which estimates the greater pressure at the bottom, estimate also the greater pressure at the side or the deck? Or would the classification society, which estimates the greater pressure near the stem, estimate also the greater pressure near the stern or amidships?	en
heal.advisorName	Τσούβαλης, Νικόλαος	el
heal.advisorName	Tsouvalis, Nikolaos	en
heal.committeeMemberName	Τσούβαλης, Νικόλαος	el
heal.committeeMemberName	Σαμουηλίδης, Μανόλης	el
heal.committeeMemberName	Ανυφαντής, Κωνσταντίνος	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Ναυπηγών Μηχανολόγων Μηχανικών. Τομέας Θαλάσσιων Κατασκευών	el
heal.academicPublisherID	ntua
heal.numberOfPages	277 σ.	el
heal.fullTextAvailability	false