Operational Strength

Recommended Prerequisites

Not applicable.

Teaching Methods

The course is composed in a way that student can simultaneously gain knowledge from proposed sheets, that

he or she gets the material in front of every course. The laboratory work is composed in a way to upgrade the

material from the theoretical course. In courses active student contribution with questions and comments is

needed.

For positive and successful execution of student obligations and connecting student in studying work the

presence in theoretical and practical course on regular basis is needed (presence at least 80% of courses), use

of extra learning material and additional preparation after working in laboratory environment and active work

on practical courses.

Two colloquia and exam.

The exam consists of a written part and oral questioning (50%/50%).

Laboratory work (100%).

Overall grade is from exam/laboratory work (100%/100%).

Learning Outcomes

The students obtain specific knowledge as an upgrade to the basic knowledge of the R&D programme in mechanical engineering and the E&M field programme. This knowledge will enable them to executedevelopmental tasks in the field of developmental evaluations. The Operational strength course upgrades the knowledge obtained in the Science of the strength of materials and Advanced science of the strength of materials courses, qualifying the student in the developmental methods, dealing with the predictions of operating and loading states during the exploitation.

Work Placement(s)

No

Syllabus

1. Describing time-variant operating conditions. Load classification. Statistical methods for the description of load states. 2. Deterministic and random load states, load spectra. 3. Experimental determination of operational strength. 4. Modeling operational strength. 5. Low-cycle strength, stress vs. cycles to failure, fatigue limit. Multi-axiality of stresses: stress- and deformation-based approach. Basics of crack propagation theory and their influence on the component life 6. Practical solutions. Tracking the operating conditions and the operating state during the operation and the whole life time.

Assessment Methods

Assessment
The exam consists of a written part and oral questioning (50%/50%). Laboratory work (100%). Overall grade is from exam/laboratory work (100%/100%).: 100.0%

Bibliography

[1] Bahram Farahmand: Fatigue and Fracture Mechanics of High Risk Parts - Application of LEFM & FMDM, 1997

[2] S. Suresh: Fatigue of Materials, 1998

[3] Norman E. Dowling: Mechanical Behavior of Materials, 2006

[4] Manuela Sander: Sicherheit und Betriebsfestigkeit von Maschinen und Anlagen: Konzepte und Methoden zur Lebensdauervorhersage, 2008

[5] Dieter Radaj, Michael Vormwald: Ermüdungsfestigkeit: Grundlagen für Ingenieure, 2009

[6] Erwin Haibach: Betriebsfestigkeit: Verfahren und Daten zur Bauteilberechnung, 2002[7] Otto Buxbaum: Betriebsfestigkeit, 1992.