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Fatigue assessments according to IIW recommendations

Förbandsklasser enligt IIW:s rekommendationer

The recommendations from IIW for fatigue analysis of welded structures are an impressive work that is very informative and comprehensive. Especially interesting is the consistent treatment and interconnection of measurements, FE (Finite Element) analyses, fracture mechanics, evaluation methods, and testing. 


The goal of the course is to enable participants to more easily and quickly familiarize themselves with the recommendations and to have the opportunity to discuss the many updates presented.


The course covers the various areas described in the recommendations, and comparisons are also made with Eurocode 3 and, to some extent, EN13001 and DNV-RP. Participants are encouraged to bring their own collected measurement data to be able to evaluate them during the course.


Prerequisites: Suitable prerequisites for this course include knowledge of fatigue design according to any design code, such as IIW, EN13001, Eurocode, or DNV-RP.


Day 1:

- General information about fatigue, the phenomenon of fatigue in welded structures.
- Evaluation methods Nominal method, Hot Spot method, Effective Notch method, Fracture mechanics.
- Design principles, Safety philosophy, Partial coefficients.


Day 2:

- Fatigue strength in constant amplitude testing, S/N-curves.

- Measurement, Testing.

- Fatigue strength based on various evaluation methods.

- Corrections and quality requirements.

- Multiaxial stress conditions.


Day 3:

- Service life calculations, Variable stresses, Methods.

- Safety aspects, Tips and advice.

- Individual Cumulative damage analyses and discussions regarding their results.

- Equivalent constant amplitude stress range.

- Determination of expected product life.

- Comparison of results depending on the choice of standard.

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