SE2137 Fatigue 6.0 credits

Utmattning

Fatigue of materials refers to changes of material- and structural properties together with premature failure from the application of cyclic loads. The topic becomes increasingly important following the emphasis on new and advanced materials together with an ongoing stride to optimize the utilization in current applications. Thus, the scope of fatigue broadens at a rapid pace. It applies to diverse materials such as metals, ceramics, composites and polymers alone and in combination with the surrounding environment. Fatigue has multitude of applications in vehicles, aerospace, machine components, biomechanics and offshore industries. The course focuses on the skills to perform fatigue analyses of existing components and the design philosophies for new fatigue exposed structures.

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Course information

Content and learning outcomes

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.

Course Disposition

No information inserted

Literature and preparations

Specific prerequisites *

Solid Mechanics basic undergraduate course SE1010, SE1020, SE1055 or the equivalent.

Recommended prerequisites

The course SE1025 FEM for engineering applications or a course with som content on the finite element method, CAD or computer aided design is a good background but no requirement. Basic course in probability and statistics is good.

Equipment

No information inserted

Literature

Handouts

Handbook in Solid Mechanics, Department of Solid Mechanics, KTH, 2013

Examination and completion

Grading scale *

A, B, C, D, E, FX, F

Examination *

  • HEM1 - Assignment, 6.0 credits, Grading scale: P, F
  • TEN1 - Examination, - credits, Grading scale: A, B, C, D, E, FX, F

Based on recommendation from KTH’s coordinator for disabilities, the examiner will decide how to adapt an examination for students with documented disability.

The examiner may apply another examination format when re-examining individual students.

The examiner, in consultation with the KTH Disability Coordinator (Funka), decides on any adapted examination for students with documented permanent impairment. The examiner may grant another examination form for reexamination of single students.

Other requirements for final grade *

Compulsory home assignments, HEM1, 6hp

Voluntary exam, TEN1, 0hp

Opportunity to complete the requirements via supplementary examination

No information inserted

Opportunity to raise an approved grade via renewed examination

No information inserted

Examiner

Bo Alfredsson

Further information

Course web

Further information about the course can be found on the Course web at the link below. Information on the Course web will later be moved to this site.

Course web SE2137

Offered by

SCI/Solid Mechanics

Main field of study *

Technology

Education cycle *

Second cycle

Add-on studies

No information inserted

Contact

Bo Alfredsson

Ethical approach *

  • All members of a group are responsible for the group's work.
  • In any assessment, every student shall honestly disclose any help received and sources used.
  • In an oral assessment, every student shall be able to present and answer questions about the entire assignment and solution.