University of Malta

Study-Unit Description
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TITLE Structural Mechanics for Maritime Applications

LEVEL 05 - Postgraduate Modular Diploma or Degree Course


DEPARTMENT Mechanical Engineering

DESCRIPTION This unit introduces the ideas covering the basic theories, the development and associated analytical equations including the origin in the area of Mechanics of Materials. The fundamental mechanics of material theories are necessary for the proper understanding of tensile and compressive stresses, bending stresses and shear stresses and how such stresses originate in a loaded structure or mechanical component.

The theories lead to the general 3 dimensional stress system necessary for engineering stress analysis and marine structural design. Elastic failure theory for isotropic, homogenous and ductile materials are introduced. The failure theories are handled together with the general system of stress to predict the onset of plasticity for a ductile material. Other failure mechanisms such as loss of stability, buckling, plastic collapse and excessive deformations are considered. Relevant theory and corresponding analytical equations and the assumptions related to such mechanisms are presented in order to serve as a basis for further studies and for understanding and using mandatory design codes in the area of Structural Marine engineering.

Following the theoretical knowledge gained, ship hull girder loadings (primary, secondary and tertiary), longitudinal strength analysis, girder response, midship section analysis and common structural rule standards are discussed. Following which an introductory analysis and design of stiffened structures are also considered.

Study-unit Aims:

This unit's intention is to direct the students through the origins and use of analytical equations necessary to calculate stresses, strains and deformations of a marine structures; introduce, analyse and design marine engineering related structural components.

The students are introduced to the concept of Design by Rule (DBR) and Design by Analysis (DBA) leading to an understanding of the mandatory maritime engineering design codes.

Following an introduction on the hull structure and the in-service girder loadings, the longitudinal strength and midship section analysis is considered in terms of the response of the girder loadings in accordance with the mandatory maritime rules and regulations. An introductory analysis, design and loadings of grillage (stiffened) structure is presented.

Learning Outcomes:

1. Knowledge & Understanding
By the end of the study-unit the student will be able to:

- identify and define the different types of stresses used in stress analysis of marine structures;
- describe the origins and derivations of the necessary equations to calculate the different stress components tensile/compressive, bending and shear for different marine structural components;
- discuss and interpret the failure mechanisms of plastic collapse, buckling and excessive deformations and which methods and equations to use for their analyses;
- interpret and implement some maritime related design codes that are mandatory for the design of marine structures;
- identify the various in-service loadings on the ship hull structure and describe the ensuing response of the structure;
- outline, interpret and discuss the salient features of a grillage (stiffened) structure.

2. Skills
By the end of the study-unit the student will be able to:

- solve the stresses due to tensile/compressive, bending, shear and torsional loads;
- analyse and model the stress in a marine structure on the basis of the 3 dimensional element in cartesian coordinates;
- calculate deformations and rotations in marine structures such as beams, frames and plates;
- demonstrate the skills to judge the onset of plastic hinges and consequently calculate the plastic collapse load of a structure;
- explain, assess and handle complications arising from different beam loading conditions such as unsymmetrical loading, different closed and open cross sectioned beams, torsional flexural effects and combined loading;
- analyse beams and plates under buckling conditions and calculate the eigenvalue buckling loads for such components with different boundary conditions;
- calculate the in-service loadings and relate to the various hull structural members;
- design a grillage (stiffened) structure and assess its performance.

Main Text/s and any supplementary readings:

Main Text:

- Mechanics of Materials, E.P. Popov, Pearson Education, 2nd Edition (1 April 1973), ISBN 978-0135713563.
- Plasticity: Theory and Application, Alexander Mendelson, Publisher R.E. Krieger, 2nd Edition (30 June 1983), ISBN 978-0898745825.
- The Maritime Engineering Reference Book. A Guide to Ship Design, Construction and Operation, Anthony F. Molland (Editor), Butterworth-Heinemann, 1st Edition (October 28, 2008), ISBN-13: 978-0750689878.
- Ship Structural Analysis and Design, O.F. Hughes, J.K. Paik, SNAME (2010), ISBN-13: 978-939773783.

STUDY-UNIT TYPE Lecture and Independent Study

Assessment Component/s Resit Availability Weighting
Examination (3 Hours) Yes 100%

LECTURER/S Claire De Marco
Martin Muscat

The University makes every effort to ensure that the published Courses Plans, Programmes of Study and Study-Unit information are complete and up-to-date at the time of publication. The University reserves the right to make changes in case errors are detected after publication.
The availability of optional units may be subject to timetabling constraints.
Units not attracting a sufficient number of registrations may be withdrawn without notice.
It should be noted that all the information in the study-unit description above applies to the academic year 2017/8, if study-unit is available during this academic year, and may be subject to change in subsequent years.

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