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BY 4.0 license Open Access Published by De Gruyter September 26, 2018

On the estimation of cyclic material properties – Part 1: Quality of known estimation methods

Dedicated to Professor Dr.-Ing. Harald Zenner on the occasion of his eightieth birthday

Zur Abschätzung zyklischer Werkstoffkennwerte – Teil 1: Güte bekannter Abschätzmethoden
Michael Wächter and Alfons Esderts
From the journal Materials Testing

Abstract

A large variety of methods for estimating cyclic material properties from quasi-static material properties can be found throughout the literature. Therefore, the user usually faces the problem of determining which methods would best suit his purpose. To help answer this question, a massive database containing test results from quasi-static and cyclic tests is gathered and used for a quality rating of the different methods. This rating results in the recommendation to use the uniform material law for steel materials, the modified park-song's method for wrought aluminum and the method of variable slopes 2006 for thin steel sheets. In addition, the accuracy of these estimation methods is compared to experimental results using deviation ranges in the total strain life curve and in the cyclic stress-strain curve.

Kurzfassung

In der Literatur lässt sich eine große Anzahl von Methoden zur Abschätzung zyklischer Werkstoffkennwerte basierend auf quasistatischen Werkstoffkennwerten finden. Hierdurch gerät der Anwender in die Situation nicht zu wissen, welche dieser Methoden er verwenden soll. Um ihn bei der Beantwortung dieser Frage zu unterstützen, wurde eine große Datenbasis mit Ergebnissen quasistatischer und zyklischer Versuche zusammengetragen und mit ihr die Güte der verschiedenen Schätzmethoden bewertet. Diese Bewertung führt zu der Empfehlung, das Uniform Material Law für Stahlwerkstoffe, die Modified Park-Song's Method für Aluminiumknetlegierungen und die Method of variable Slopes 2006 für dünne Stahl-Feinbelche zu verwenden. Außerdem wird die Güte dieser Abschätzmethoden mit der Güte experimenteller Ergebnisse mithilfe der Streuspanne für die Gesamtdehnungswöhlerlinie sowie die zyklische Spannungs-Dehnungs-Kurve verglichen.


*Correspondence Address, Dr.-Ing. Michael Wächter, Institut für Maschinelle Anlagentechnik, und Betriebsfestigkeit, TU Clausthal, Leibnizstraße 32, 38678 Clausthal-Zellerfeld, Germany, E-mail:

Dr.-Ing. Michael Wächter, born in 1986, studied Mechanical Engineering at Clausthal University of Technology (TUC), Germany and has been a scientific employee at the Institute for Plant Engineering and Fatigue Analysis (IMAB) of TUC since 2011. He finished his PhD thesis on the determination of cyclic material properties and S-N curves for damage parameters in 2016.

Professor Dr.-Ing. Alfons Esderts, born in 1963, studied Mechanical Engineering at Clausthal University of Technology (TUC), Germany and finished his PhD thesis in 1995. Between 1995 and 2003 he was head of the “Fatigue Analysis” department at Deutsche Bahn AG in Minden, Germany. Since 2003 he has been a professor at TUC and the head of the Institute for Plant Engineering and Fatigue Analysis (IMAB). In addition, he has been vice-president for research and technology transfer at TUC since 2015.


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Published Online: 2018-09-26
Published in Print: 2018-10-27

© 2018, Carl Hanser Verlag, München

This work is licensed under the Creative Commons Attribution 4.0 International License.

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