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CCOPPS: Fatigue of Welded Pressure Vessels
CCOPPS Project
May 21st, 2008
7am PDT (Los Angeles) / 10am EDT (New York) / 3pm BST (London)
Length: 1 hour
Event Type:Webinar
Location: Online,UK
Date: May 21, 2008
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The CCOPPS Industry Needs Survey (http://www.ccopps.eu/
) highlighted facilities for weld modelling and assessment as poor
by 53% of respondents. Given also the prevalence of welding in
pressure vessels and the role of fatigue as a major failure
mechanism, the topic of this second CCOPPS webinar, delivered by a
renowned expert in the fatigue of welded components, should be of
wide interest.
After a brief introduction to the main features of welded joints
that affect their fatigue performance, various design methods, and
associated fatigue resistance data in the form of S-N curves, for
the avoidance of fatigue failure are described. Specific examples
of fatigue design rules for pressure vessels, including those in EN
13445, BS PD 5500 and ASME VIII, are then presented and compared.
Topics to be addressed include the stresses used, with special
attention to the structural hot-spot stress, including methods for
its determination and fatigue test data that provide a basis for
corresponding design S-N curves, plasticity corrections and the
treatment of multi-axial loading. In addition, required corrections
to S-N curves, fatigue life improvement methods, assessment of
welding imperfections and design on the basis of special fatigue
test data are covered. Finally, screening tests, to avoid the need
for further consideration of fatigue, and simplified fatigue design
methods, are compared.
Agenda
Introduction and CCOPPS Update
Dr. Jim Wood, University of Strathclyde and CCOPPS Project
Co-ordinator
Fatigue of Welded Pressure Vessels
Professor Stephen Maddox, TWI
Q & A Session
Closing
1 This webinar is the second in a series of four sponsored by the
CCOPPS project, which is funded by the EU under the Leonardo
initiative. The project is focussed on the development of the
competence of users of FEA in the power and pressure systems
industry. The project partners are the University of Strathclyde,
University of Malta, University of Stuttgart, Technical University
of Warsaw, CETIM and NAFEMS.
www.CCOPPS.eu
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Webinar Presenters
Professor Stephen Maddox
 Professor Stephen Maddox is Fatigue Technology Manager at TWI
in Cambridge UK, where he has almost 40 years experience in the
design and engineering performance of welded components and
structures, with emphasis on fatigue. Apart from research and
consultancy, he has been involved extensively in the development of
design recommendations and procedures, notably for bridges,
pressure vessels, offshore and aluminium structures, and the
practical application of fracture mechanics to fatigue. In his
current position he acts as specialist advisor to other staff,
technical supervisor of major projects and TWI representative on a
number National and International code-writing committees. He is
currently Visiting Professor in the Department of Mechanical
Engineering at the University of Strathclyde.
A Chartered Engineer and registered European Engineer, he has
published over 120 papers and books, including the textbook
'Fatigue Strength of Welded Structures'
Dr. Jim Wood
 Dr. Jim Wood, leader of the CCOPPS project, is a senior member of
staff in the Department
of Mechanical Engineering at the University of Strathclyde.
In addition to wide research interests, he has provided consultancy
in the PV area for some 30 years and also taught FEA for 10 years
on an MSc in PV Design. Particular interests include finite element
analysis of pressure vessels and the modelling and fatigue
assessment of welded components. He has been a member of NAFEMS
since its formation and is currently a member of Council, as well
as member of the ETWG, assessor for the Registered Analyst Scheme
and on the organizing Committee for the NAFEMS World Congress
Series.
A Chartered Engineer, Fellow of several professional bodies and a
NAFEMS Registered Analyst at advanced level.
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