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      Life time assessment of an aluminum alloy under complex low cycle fatigue loading* Translated title: Lebensdauerabschätzung für eine Aluminiumlegierung unter komplexer Ermüdungsbeanspruchung bei geringen Lastwechseln

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      Materials Testing
      Carl Hanser Verlag

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          Abstract

          This publication presents an expression for the equivalent strain based on fatigue tests under complex strain state. The respective aluminum alloy was tested under a very low number of cycles. The criterion uses the critical plane determined according to the material kind function. The determined equivalent amplitude for complex proportional and non-proportional loading states is included into the scatter band of the same coefficient for simple loading states. The model based on the proposal by Carpinteri for determination of the critical plane position under a complex strain state can be a useful tool for fatigue life assessment in the case of a very low number of cycles. The expression for the equivalent strain includes both the normal and shear strain histories on the critical plane with suitable weight functions. The determined equivalent amplitude for complex proportional and non-proportional loading states is also included into the scatter band of the same coefficient for simple loading states.

          Kurzfassung

          Der vorliegende Beitrag präsentiert einen mathematischen Ausdruck für die Äquivalenzdehnung basierend auf Ermüdungsversuchen unter komplexen Dehnungszuständen. Die entsprechende Aluminiumlegierung wurde bei einer sehr geringen Anzahl von Lastwechseln geprüft. Das Kriterium verwendet die kritische Ebene, die anhand der Materialtypfunktion bestimmt wird. Die so bestimmte Äquivalenzamplitude für die komplexen proportionalen und nicht-proportionalen Beanspruchungszustände wurde in einem Streuband für denselben Koeffizienten bei einfachen Beanspruchungszuständen berücksichtigt. Das auf dem Ansatz von Carpinteri zur Bestimmung der Position der kritischen Ebene unter einem komplexen Dehnungszustand basierende Modell kann ein nützliches Werkzeug für die Abschätzung der Ermüdungslebensdauer im Falle sehr niedriger Lastwechselzahlen sein. Der Ausdruck für die Äquivalenzdehnung beinhaltet beides, die Normal- und die Scherdehnungshistorien auf die kritische Ebene mit geeigneten Gewichtungsfunktionen. Die bestimmte Äquivalenzamplitude für die komplexen proportionalen und die nicht-proportionalen Beanspruchungszustände ist ebenfalls in dem Streuband für dieselben Koeffizienten bei einfachen Beanspruchungszuständen eingeschlossen.

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          Author and article information

          Journal
          mp
          Materials Testing
          Carl Hanser Verlag
          0025-5300
          2195-8572
          2 February 2015
          : 57
          : 2
          : 160-164
          Affiliations
          1 Opole, Poland
          Author notes
          [§ ] Correspondence Address, Prof. Dr. Tadeusz Lagoda, Opole University of Technology, Ul. Mikołajczyka 5, 45-271 Opole, Poland, E-mail: t.lagoda@ 123456po.opole.pl

          Dr. Karolina Walat, born in 1981, studied Environmental Engineering at the Technical University of Opole, Poland, and graduated in 2006 with MSc. Then she completed PhD studies at the Technical University of Opole in 2010. Since 2011, she has been working at this university as a lecturer.

          Prof. Dr. Tadeusz Łagoda, born in 1965, studied Mechanical Engineering at the Technical University of Opole, Poland, and graduated in 1989 with MSc. Since 1989, he is working at this university as professor. He completed PhD studies in 1996 and habilitated at Technical University of Wrocław, Poland, in 2001. He received the title of professor in 2007. Now he is working as Professor at the Technical University of Opole in the Faculty of Mechanics and Department of Mechanics and Machine Design.

          Dr. Marta Kurek, born in 1985, studied Technological and Computer Engineering Education at the Technical University of Poland (OPole University of Technology), Poland, and graduated in 2009 with MSc. Then she completed PhD studies at the Technical University of Opole in 2013. Since 2012, she has been working at this university as an assistant.

          Article
          MP110692
          10.3139/120.110692
          de756148-44d9-44ec-a84f-af149448b550
          © 2015, Carl Hanser Verlag, München
          History
          Page count
          References: 21, Pages: 5
          Categories
          Fachbeiträge/Technical Contributions

          Materials technology,Materials characterization,Materials science
          Materials technology, Materials characterization, Materials science

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