Engineering Design and Product Reliability
© KuP
Strength and Fatigue

Learning content and outcomes

Learning content

Optimal static and operational design of components with a focus on mechanical engineering and drive technology including

- Loads, load-time functions, load collectives, special loads

- Determining component stresses from loads

- Suitable material mechanical models

- Computational determination of multi-axial loads with FEM (linear-elastic and modified Neuber hyperbola or elastic-plastic)

- Residual and thermal stresses - associated static design concepts

- Associated time, fatigue and durability concepts for life prediction - reliability and safety - comparison of computational and experimental results for model improvement

- ABC concept according to Mertens

- Fracture mechanics concepts for time, fatigue and operational strength of sharp-notched and cracked components (crack propagation calculations) for quality assurance and the service life phase

- Determination of remaining service life in operation

- Determination of inspection intervals - Learning from damage cases

- Strength hypotheses for smooth and notched components taking into account multiaxiality, plasticity, stress embrittlement, support effects

- Common time, fatigue and fatigue strength checks of normally notched components (nominal, structural and notch base stress concepts, LCF, HCF, creep)

- Linear elastic fracture mechanics with practical application

- Standards


Learning outcomes

Understanding of:

- Differentiating between load types, load collectives and special loads

- Principles of engineering statistics - Differentiating between stress types, failure types and failure hypotheses

- Fundamentals of fatigue, time and fatigue strength theory and application

- Theory of crack formation and linear-elastic fracture mechanics

Specialist skills:

- Determining stresses from loads

- Representing stresses using Mohr's circle

- Applying failure hypotheses

- Applying methods for fatigue strength verification and linear-elastic fracture mechanics


- Performing strength and durability assessments of statically and dynamically highly stressed structures

- Ability to evaluate the influence of notches on the strength of components

- Ability to formulate design recommendations regarding stress reduction or strength enhancement for the demanding late stages of the design process

Participation scope and requirements

The course encompasses a lecture (2 course hours per week) and a practical tutorial (2 course hours per week) and is only offered during the winter semester.

If you would like to take this module and complete it with an oral exam, please take note of the following requirements for the module exam registration:

- Successful completion of coursework

Registration for the current semester

Please use ISIS to register for the 2022/23 winter semester.

All further information about the semester will also be posted there.


If you have any questions about the course or scheduling, please contact:

Dr.-Ing. Tien Dat Phan

Please discuss any technical questions with your tutor during the practical tutorial/tutorial or office hours.

Exam dates


Certificate of performance


Validity of the certificate of performance

The certificate of performance is required to register for the module exam. You must acquire it once. After this, it is valid indefinitely. It does not expire because it is not part of the module exam.


Examination registration

Are there any requirements to register for the exam?

Yes, you must have earned your certificate of performance. This is awarded following successful completion of all coursework during the semester.


Examination period

  • At the beginning of the lecture period: April or October
  • At the end of the lecture period: February or July

(You can also take the exam for Design Against Stress on the exam dates for this module and vice versa.)


Examination registration

You can reserve the exam date and upload your exam registration and certificate of performance to ISIS.

Examination procedure and topics

Topics on the exam

The exam may include any topics covered in the course.


Exam procedure


You will receive computational tasks to complete before the oral component. The written and oral components must be completed on the same day. It is not possible to complete each component separately. Both components are factored into your overall performance and grade.