Structural Integrity Analysis (Fatigue & Fracture)

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Structural Integrity Analysis Training


Following a general introduction to fatigue and fracture, with examples of service failures, current and developing fatigue design and assessment methods will be described. The course will go on to explain the importance of crack/flaw analysis in structural design and safety assessment and illuminate its wide range of applicability. It will give a deep understanding of the major results and criteria underpinning modern fracture mechanics, the assumptions behind them and important limitations. Attendees will gain a better understanding of material selection for fatigue and fracture resistance and learn about codified procedures for flaw evaluation.
The course will introduce fundamental concepts of Engineering critical assessment / Fitness for service assessments; from stress intensity factor, CTOD and J-integral to methods of measuring and calculating fracture toughness for use in the ECA assessment. The fracture and fatigue crack growth assessment methodology of BS 7910 shall be presented and illustrated with examples.


Engineers and scientists involved in the design, operation and assessment of both onshore and offshore structures.


Day 1

09.00 – 10.30 Lecture 1: Introduction and Irwin’s equations – Professor Luca Susmel

Linear elastic stress, Hooke’s law, Mode I/II/III loading, Singularities and stress fields, Irwin’s
equations, Shape factor.

10.30 – 10.45 Break

10.45 – 12.15 Lecture 2: Fracture toughness – Professor Luca Susmel

Static assessment according to LEFM, fracture toughness, plane stress vs. plane strain problem.

12.15 -13.30 Lunch

13.30 – 15.00 Lecture 3: Scale effect and limitations of LEFM – Professor Luca Susmel

Scale effect, definition of critical distance a0, continuum vs. linear elastic fracture mechanics.

15.00 – 15.30 Break

15.30 – 17.00 Lecture 4: 4: LEFM and fatigue loading – Professor Luca Susmel

Fundamental definitions, crack growth rate, Paris’ diagram and Region I, II, and III, fatigue
assessment according to LEFM.

Day 2

09.00 – 10.30 Lecture 5: Introduction and S – N Curve – Dr Helena Polezhayeva

Fatigue mechanism of materials Fatigue mechanism of welded structures Fatigue design principles
Fatigue damage models Uncertainties in fatigue damage prediction Major factors affecting fatigue life
Origin of SN curve & Fatigue test Segments of SN curve SN curve for welded structural details.

10.30 – 10.45 Break

10.45 – 12.15 Lecture 6: Effect of Stress Concentration specific to offshore structures – Dr Helena Polezhayeva

Introduction and lessons learned from the past Definition of stress concentration factor (SCF)
Methods for assessing SCF Stress concentration in hull structural details Stress concentration at welds Finite element modelling for SCF.

12.15 -13.30 Lunch

13.30 – 15.00 Lecture 7: Rules for Fatigue design of Welded Structures, Effects of Random Loads, Mean Stress, Thickness and Material Strength – Dr Helena Polezhayeva

Fatigue assessment process for hull and offshore structures Assessment of local stress in structural
details for fatigue analysis Evaluation of hot-spot stress Secondary stress Design SN curve Strain-Life Criterion-based Approach Basics and Application Local Strain Methodology Strain Life Cyclic
Curves Strain-Life Criterion for Fatigue Evaluation of Local Strain Applications.

15.00 – 15.30 Break

15.30 – 17.00 Lecture 8: Spectral fatigue analysis: main steps – Dr Helena Polezhayeva

Overview of Spectral fatigue analysis, Hydrodynamic model, Structural Model, Wave Spectrum,
Global Wave Statistics, Metocean Data, Hot Spot Stress Approach, Short term Fatigue Damage, Long term fatigue Damage.

About the Lecturers

Professor Luca Susmel
Luca Susmel studied his undergraduate degree in the Department of Mechanical Engineering at the
University of Padova, Italy, and completed his PhD between Padova and Dublin, Ireland.
From 2001 to 2011 he spent at least six months every year lecturing and doing research in the
Department of Mechanical and Manufacturing Engineering at Trinity College, Dublin. In 2005, he was
appointed Associate Professor in Structural Integrity at the University of Ferrara, Italy. He joined the
Sheffield Department of Civil and Structural Engineering in 2011 to continue his research on the fatigue and fracture behaviour of engineering materials, components and structures.
Since 1998 Luca has focussed his attention mainly on problems related to the structural assessment of engineering materials and components. By working both in Italy (University of Padova, University of Ferrara, University of Udine), in Ireland (Trinity College, Dublin) and in the UK (University of
Sheffield) he has devised several novel engineering methods suitable for designing components
(experiencing stress concentration phenomena of all kinds) against static, dynamic, and fatigue failures. Luca’s modus operandi involves taking a conjoint theoretical and experimental approach to cracking problems and all the design methods he has formalised so far have been fully validated through systematic experimental work. Luca has unique expertise in designing notched and welded components against constant and variable amplitude multiaxial fatigue.
The work done in the above research areas has led to a large number of scientific articles published in international peer-reviewed scientific journals as well as to a book devoted to multiaxial fatigue
assessment. His scientific papers have attracted significant interest from the international scientific
community, as it is evidenced by his h-index as well as by the total number of citations. He is a member of the Editorial Boards of the two leading international journals in the fatigue and fracture field, namely “International Journal of Fatigue” and “Fatigue & Fracture of Engineering Materials & Structures”.
Luca is also the Associate Editor of “Frattura ed Integrità Strutturale: The International Journal of the
Italian Group of Fracture” and the Editor-in-Chief of “Theoretical and Applied Fracture Mechanics”
(published by Elsevier) which is one the top journals in the fracture mechanics field.
In terms of the transfer of his research outcomes into engineering practice, in recent years Luca’s
expertise has been sought on many occasions by a number of European and non-European structural engineering companies that have successfully applied the approaches developed by Luca to design real components and structures.
Luca’s work has applications beyond traditional structural civil engineering. For example, in the past,
he collaborated with General Motors (via American company ADACS Inc.) on the fatigue design of
engines, and with Italian Company Filippi on the determination (in their Olympic medal winning boats) of the loads being applied by athletes during rowing.
Dr Helena has more than 30 years’ experience, and is internationally recognised as a fatigue expert,
specialising in the development of spectral fatigue analysis and fatigue assessment procedures for a
wide variety of ship types and offshore structures.
Dr Helena also has expertise in fatigue related consultancy and research including fatigue testing and numerical analysis as well as the development and delivery of fatigue training. Helena was awarded a Royal Society Fellowship in 1994 for her Post-Doctoral research

Duration: 2 Days

Cost: £750 + VAT


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Scheduled Courses:

    DateCourse NameLocationPrice (Excluding VAT)Book
    24 Oct - 25 OctStructural Integrity Analysis (Fatigue & Fracture)Glasgow£750Enquire Now