Innhold / content
Dette kurset vil fokusere på historiske utmattingsulykker, grunnleggende innføring i utmatting med testing og avanserte utmattingsmetoder. Forbindelser med sveiser og bolter vil bli dekket. Typiske utmattingsfølsomme konstruksjoner som understell, flytere og vindturbinkonstruksjoner vil bli dekket. Relevante eksempler vil bli inkludert. Kurset vil hovedsakelig være basert på offshorestandarder som DNV-RP-C203.
/ This course will aim on focusing on historic fatigue accidents, basic fatigue introduction with testing and advanced fatigue methods. Connections with welds and bolts will be covered. Typical fatigue sensitive structures will be covered such as jackets, floaters and wind turbine structures. Relevant examples will be included. The course will mainly be based on offshore standards such as DNV-RP-C203.
Forelesere / lecturers
Arne Fjeldstad, Thomas Johansen, Frode Bratbakk og others from DNV.
Språk / language
Slides will be prepared in English and the course will be given in Norwegian. Questions can be asked in English.
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PROGRAM
13 November 2025
08.45 Registrering / login
09.00 P1 Introduction
• History of fatigue
• Examples of fatigue failures of marine structures
• Types of marine structures
• Design methodology for marine structures
• Relation to relevant fatigue design standards for different types of structures
09.30 P2 Fatigue degradation mechanism and failure modes
• General
• Low Cycle and High Cycle Fatigue
• Failure modes due to fatigue
10.00 P3 Fatigue testing and assessment of test data
• Planning of fatigue testing
• Laboratory fatigue testing
• Derivation of S-N curves for design
10.45 Coffee break
11.00 P4 Fatigue design approaches
• Nominal stress method
• Hot spot stress method
• Notch stress method
• Fracture mechanics
• Stress concentration factors
12.15 P5 Probability of fatigue failure
12.30 Lunch
13.30 Probability of fatigue failure (cont)
14.15 P6 Fabrication
• Potential defects and non-destructive testing
• Fabrication tolerances
• Improvement methods
15.15 Coffee break
15.30 P7 Long term stress range distributions
• Weibull distribution
• Deterministic fatigue analysis
• Stochastic fatigue analysis
16.30 – 17.00 Closure
Lecturer: Arne Fjeldstad
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14 November 2025
09.00 P8 Examples of finite element analysis of plated structure using the hot spot stress method and notch stress analysis
10.15 P9 Damage and repair
• Examples
• Planning of repair
10.45 Coffee break
11.00 Damage and repair (cont)
11.45 P10 Fatigue analysis of jacket structures
• Analysis process
• Deterministic and stochastic analysis
• Stress concentration factors for tubular joints
• Accounting for dynamic effects
• Fatigue governing details
12.30 Lunch
13.30 Fatigue analysis of jacket structures (cont)
12.45 P11 Fatigue analysis of floating structures
• Analysis process
• Hydrodynamic analysis
• Mass modelling
• Load and load effects
• Fatigue governing details
15.15 Coffee break
15.30 P12 Fatigue analysis of offshore wind turbine structures
• Structure types
• Safety level
• Loads
• Analysis methodology
• Non proportional loads
16.30 – 17.00 Closure
Lecturers: Arne Fjeldstad, Frode Bratbak and Thomas Johansen.
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Praktisk info / practical info
Tid / time
13. and 14. November 2025
Sted / venue:
Thon Hotel Slottsparken, Oslo – og med mulighet til å delta digitalt via Teams
/ and with the opportunity to participate digitally via Teams
Dokumenter / documents:
Kurset inkluderer e-kurskompendium / The course includes e-course compendium.
Litteratur / literature:
DNV-RP-C203 Fatigue Design of Offshore Steel Structures, kan lastes ned HER / download HERE.
Administration:
Norsk Stålforbund / NFS sekretariat
Tel. 41 02 15 98
E-mail: post@stalforbund.com
Deltakeravgift / participation fee:
NOK 11 400 for members of Norsk Forening for Stålkonstruksjoner and Norsk Stålforbund
NOK 14 900 for non-members
Kvantumsrabatt -10% for minimum 3 deltakere fra samme foretak ved samlet påmelding
/ Quantity discount -10% for a minimum of 3 participants from the same company when registering together
For søknad om medlemskap, send epost til: post@stalforbund.com
/ to apply for membership, send an email to: post@stalforbund.com
Påmeldingsfrist: Tirsdag 11. november – kl. 16:00
/ Registration deadline: Tuesday, November 11th – 4:00 PM
