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This course can be followed digitally and/or physically and covers fatigue theory, experimental planning and engineering fatigue design using FEA. Lectures and Home assignments on: Fatigue design, fatigue of welded structures, fatigue of 3D printed parts, Environmental effects on fatigue and fatigue crack growth.

Course contents

The course is based on theory and observations on the onset of fatigue. The focus is on engineering methods for assessing the fatigue risk and compuation of expected life, including the impact of the environment.

The course contains:

Stress and strain based methods for design against fatigue at uniaxial loadings with regards to both finite life and fatigue limit.
Design with damage accumulation at loads with variable amplitude.
Criteria for design agains multiaxial loadings where the multiaxial loads can be proportional or non-proportional.
Statistical methods to determine the risk of failure of a component.
Linear fracture mechanics to determine the crack growth rates and predict the expected life of a component.
Phenomenological identification of fatigue as the cause of failure.
Different mechanisms for the origin of fatigue.
Different mechanisms for environmental failures.
Methods to include environmental effects on fatigue strength.
Application specific forms of fatigue.
Fatigue in different types of materials.
Computer tools and a fatigue database for fatigue evaluation.

Intended learning outcomes

The course purpose is for the participants to understand the onset of fatigue, the damage process for fatigue, be able to use different tools and methods to design against fatigue, determine the risk for failure and determine the expected component life.

After course completion, the participants should be able to:

understand the origin of fatigue, the damage process and the influence of environment on the process,
identify fatigue damage compared to other failure modes,
design against fatigue,
quantify the risk for failure due to fatigue and
determine the expected life of a component including the effect of environment.