Life time assessment of an aluminum alloy under complex low cycle fatigue loading*
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Karolina Walat
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.
References
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© 2015, Carl Hanser Verlag, München
Artikel in diesem Heft
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- Kalender/Calendar
- Kalender
Artikel in diesem Heft
- Inhalt/Contents
- Inhalt
- Vorwort/Editorial
- Vorwort
- Fachbeiträge/Technical Contributions
- Fatigue assessment of full-scale welded crane runway girders*
- Cyclic plastic response of nickel-based superalloy at room and at elevated temperatures*
- Fatigue behavior of calcium containing AZ91 magnesium alloys*
- Influences on the thermomechanical fatigue crack growth of the nickel alloy 617*
- Influence of laser cutting on the fatigue limit of two high strength steels*
- Fatigue life and cyclic material behavior of butt-welded high-strength steels in the LCF regime*
- Ratcheting behavior of bearing support structures during windmilling in aero engines*
- Transient micromechanical deformation and thermomechanical fatigue damage in AlSi based piston alloys under superimposed high cycle mechanical and low cycle thermal loading*
- Life time assessment of an aluminum alloy under complex low cycle fatigue loading*
- Testing low-cycle material properties with micro-specimens*
- Estimation of local cyclic plasticity based on a coupled EBSD and TEM analysis*
- Kalender/Calendar
- Kalender
