(Low-Cycle-) Fatigue Design According to DIN EN 1999-1-3 State of the Art and Current Research

Abstract:

DIN EN 1999-1-3 presents a comprehensive framework for fatigue design of aluminum structures. Various structural details and joints are included. For safety checks against High-Cycle Fatigue, three design concepts are available: Safe-Life-Design, Damage-Tolerant-Design and Design assisted by Testing. Respective safe-life-design lines are based on a databank including results from stress controlled Wöhler fatigue tests. The phenomenon of Low-Cycle-Fatigue (<10⁵ cycles) is treated in Annex F, giving design regulations for selected structural details. Thereby, the influence of different alloys and thus different yield strength values is not considered. In addition, plasticizing effects under high stress ranges are neglected. In general, engineers face the following questions: Which cycle numbers require (Low-Cycle-) fatigue design and thus where is the limit for static design Furthermore, how to define the maximum allowable stress range Respective answers are investigated in a current research project carried out by the Chair of Metal Structures, TU Munich.In this contribution, the state of the art of fatigue design according to DIN EN 1999-1-3 is presented. European design concepts are discussed in view of available data and new developments in research, quality control, fabrication of specimen as well as testing techniques. The focus is then laid on Low-Cycle Fatigue. A new concept, including the influence of alloy type and the effects of plasticizing, is worked on. To this purpose an extensive testing program has started, including a large number of strain-controlled-tests.

• Periodical: Key Engineering Materials (Volume 710)
• Pages: 439-444
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.710.439
• Online since: September 2016
• Authors: Christina Radlbeck*, Mathias Rengstl, Senta Pessel, Martin Mensinger
• Keywords: Aluminium, Design Concepts, Fatigue, Low-Cycle-Fatigue (LCF), Strain-Controlled Material Testing

References

[1] DIN EN 1999-1-3, Eurocode 9, Bemessung und Konstruktion von Aluminiumtragwerken, Teil 1-3: Ermüdungsbeanspruchte Tragwerke, Beuth Verlag GmbH, Berlin, (2011).

DOI: 10.31030/1816555

[2] Kosteas, D., On the Fatigue Service Behavior of Aluminium, Stahlbau Spezial 67 Aluminium in Practice, Ed.: D. Kosteas, Verlag Ernst & Sohn, Berlin, pp.111-130, (1998).

[3] Kosteas, D., ALUMINIUM DESIGN – CONCEPTS AND TOOLS, The Fifth International Forum on Aluminum Ships Tokyo, Japan 11-13, October, (2005).

[4] Jaccard, R., On the Fracture Behavior of Aluminium Structural Elements, Stahlbau Spezial 67 Aluminium in Practice, Ed.: D. Kosteas, Verlag Ernst & Sohn, Berlin, pp.54-65, (1998).

[5] Ondra, R., Kosteas, D., Practice-oriented Design Values for the Crack Propagation of Welded Aluminium Joints, Stahlbau Spezial 67, Verlag Ernst & Sohn, Berlin, pp.108-110, (1998).

[6] DIN EN 1999-1-1 Eurocode 9, Bemessung und Konstruktion von Aluminiumtragwerken, Teil 1-1: Allgemeine Bemessungsregeln, Beuth Verlag GmbH, Berlin, (2014).

DOI: 10.1002/9783433605103.part2

[7] Manson, S., Behavior of materials under conditions of thermal stress, National Advisory Committee for Aeronautics (NACA), Report No. 1170, Washington, D.C., (1954).

[8] Seeger, T., Unterlagen zum Seminar Betriebsfestigkeit auf der Grundlage örtlicher Beanspruchungen, FG Werkstoffmechanik, TU Darmstadt, (1998).

[9] http: /www. aluservice. de/ratgeber/aluminium/was-sind-aushaertbare-aluminiumlegierungen. html.

[10] T. Seeger, Grundlagen für Betriebsfestigkeitsnachweise, in s Stahlbau Handbuch 1 Teil B, Köln, Stahlbau-Verlagsgesellschaft mbH, 1996, pp.5-123.

[11] DIN EN ISO 10042, Schweißen – Lichtbogenschweißverbindungen an Aluminium und seinen Legierungen, Beuth Verlag GmbH, Berlin, (2006).

DOI: 10.31030/2838316

[12] EN 1090-3, Ausführung von Stahltragwerken und Aluminiumtragwerken – Teil 3: Technische Regeln für die Ausführung von Aluminiumtragwerken, , Beuth Verlag GmbH, Berlin, (2008).

DOI: 10.31030/9877835

[13] Anthes, R. J., Köttgen, V. B., Seeger T., Kerbformzahlen von Stumpfstößen und Doppel-T-Stößen, Schweißen und Schneiden 45 (1993), Heft 12, p.685 – 688.

[14] Morgenstern, C., Kerbgrundkonzepte für die schwingfeste Auslegung von Aluminiumschweißverbindungen (AW-5083 und AW-6082 T6), Darmstadt, (2006).

DOI: 10.1002/mawe.200600089

[15] ISO 12106: Metallic materials – Fatigue testing – Axial-strain-controlled method, the International Organization for Standardization, Geneva, (2003).