Nachweis der Ermüdungsfestigkeit mittels Kerbdehnungskonzept: Eine Einführung für Praktiker - Stand der Technik, Praxiseinsatz und aktuelle Forschung

摘要

The proof of fatigue strength in the field of structural steel engineering is typically performed applying the nominal stress concept as specified by the appropriate code. When nominal stresses cannot be defined due to the component's complexity the proof of fatigue strength in the framework of EN 1993-1-9 has to be performed applying the modified nominal stress concept or the structural hot-sport stress concept. By doing so, no statement can be made about plastic yielding in the notch area, but the behavior can be regarded as taken into account. On the other hand, the local strain approach enables the proof of strength by applying local strains evaluated directly in the notched area under the consideration of an elastic-plastic material response. Recent research as well as standardization efforts seem to pay more attention to this concept. Consequently, it can be assumed that this approach will become more accepted and applied in the German-speaking design community. As the local strain approach has particular features, the contribution at hand aims to serve as a first introduction for the practical engineer.