OVERVIEW

The course regards the Finite Element Method for solving linear static mechanical problems related with boat structures.

AIMS AND CONTENT

LEARNING OUTCOMES

The unit will supply students with finite element basic theoretical concepts then a multipurpose and a shipstructure dedicated FEM codes will be used to solve generic structural problems . The unit includes exercises regarding practical applications.

AIMS AND LEARNING OUTCOMES

At the end of the course the students will:

• have a basic knowledge of the finite element method for structural design
• be able to choose the appropriate FEM modeling strategies to simulate ship structural behaviour
• be able to use a widely used commercial software to study structures within linear elastic analysis.

TEACHING METHODS

Lectures and guided exercises in IT class. Totally, 60 hours of lectures

SYLLABUS/CONTENT

Introduction: structural mechanics models (beam, shell theory), finite element method. Limit state checks and application of structural models to ship and offshore structures

Modern rule checks: IMO Goal Based Standards, rule scantling checks, general principles and idealization of structural components, models selection depending on check types, definition of actions and application to structural models, relevant implications and approximations.

Structural modeling: analytical and numerical models, 2D and 3D models (frames, grillages, plates, orthotropic plates, stiffened panels, complex models). Finite element modeling strategies. Local and global models, primary, secondary and tertiary strength, interaction of structural models.

Analysis types: static linear, collapse (non linear), buckling and modal (Eigenvalues), dynamic in time domain (hints). Post-processing, critical analysis and presentation of results.

Planned exercises (to be discussed during the examination):

a) Introduction to FEM software (Kirsch problem, frames, grillages, etc.)

b) Scantling checks on a typical stiffened panel (e.g. deck panel with boundary conditions on bulkheads and side shell)

c) Scantling check of a ship transverse section (e.g. web frame of a longitudinally framed ship)

d) Three holds/tanks model according to classification societies rules ((e.g. according to IACS H-CSR, Ch.7)

e) Scantling checks of stress concentration factors and fatigue assessment of typical structural details

f) Application example of a dynamic analysis (voluntary and variable each academic year)

RECOMMENDED READING/BIBLIOGRAPHY

Zienkiewicz, Olek C., and Robert L. Taylor. The finite element method for solid and structural mechanics. Elsevier, 200

Classification societies rules for ships and offshore structures (www.iacs.org.uk), with emphasis on the recently issued IACS Harmonized Common Structural Rules and pleasure craft and yacht rules

Hughes OF, Paik JK (2010): Ship structural analysis and design, SNAME (ISBN No. 978-0-939773-78-3)

Lamb T. Editor (2004): Ship Design and Construction, SNAME (ISBN 0-939773-41-4)

Lewis EV Editor (1988): Principles of Naval Architecture, SNAME (ISBN-13: 978-0939773008)

Mansour A, Liu D (2008): Strength of Ships and Ocean Structures, SNAME (ISBN No. 0-939773-66-X)

Okumoto Y, Takeda Y,·Mano M, Okada T (2009): Design of Ship Hull Structures, Springer (ISBN: 978-3-540-88444-6)

TEACHERS AND EXAM BOARD

Exam Board

DARIO BOOTE (President)

TOMASO GAGGERO (President)

MICHELE MARTELLI (President)

CESARE MARIO RIZZO (President)

MASSIMO FIGARI

LESSONS

LESSONS START

As per official calendar of the Polytechnic School at Polo Marconi, La Spezia

Class schedule

The timetable for this course is available here: Portale EasyAcademy

EXAMS

EXAM DESCRIPTION

Oral examination including discussion of exercises carried out during the course (to be presented as a printed report)

ASSESSMENT METHODS

Judgement of reported exercises (30%) and on replies to 3 open questions (70%). Content as well as clarity of report and replies will be judged.

Exam schedule