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Influence of rolling texture on near-threshold crack extension behavior in aluminum alloy EN AW-6082

  • Marcel Wicke , Angelika Brückner-Foit , Tina Kirsten , Martina Zimmermann , Fatih Bülbül and Hans-Jürgen Christ
Published/Copyright: March 26, 2019
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Abstract

The near-threshold crack extension mechanisms of long cracks in a commercial aluminum alloy in peak-aged and overaged condition were evaluated at a stress ratio of R = −1. Tests were performed both in a conventional resonant testing machine, using flat dog-bone specimens with through-wall cracks and on an ultrasonic fatigue testing system using hourglass-shaped samples with surface cracks. After introducing the initial crack, the crack was propagated at a nominally constant Kmax with values in the range of the initially determined threshold. The primary precipitates were found to act as microstructural barriers causing a local pinning of the crack front independent of the testing procedure and hence keeping the crack from extending continuously. This effect depends on the orientation of the initial crack with respect to the rolling texture which, in turn, determines the spatial distribution of the primary precipitates and the grain morphology. Overaging had a tendency to enhance the pinning potential of the primary precipitates.


*Correspondence Address, Marcel Wicke, Institute of Material Engineering, University of Kassel, Mönchebergstraße 3, 34125 Kassel, Germany, E-mail:

M Sc Marcel Wicke, born in 1990, studied Mechanical Engineering at the University of Kassel, Germany. After his Master's degree in 2015, he worked at the Institute of Materials Engineering focusing on the computational characterization of casting defects in Al-Si alloys. Since 2016, he has been working as a research assistant studying fatigue of Al alloys in the Department of Quality and Reliability of the Institute of Materials Engineering at the University of Kassel, Germany.

Prof. Dr. rer. nat. Angelika Brückner-Foit, born in 1953, studied Physics at the University of Karlsruhe, Germany and obtained her PhD in1980. From 1980 to 1989, she was Head of the Department of Stochastic at the Institute of Materials Research II of Karlsruhe Research Center. From 1985 to 1986, she worked as a guest scientist at the Center for Applied Stochastics Research of Florida Atlantic University, USA. From 1989 to 2000, she was academic supervisor at the Institute of Reliability and Damage in the Mechanical Engineering Department at the University of Karlsruhe. Since 2000, she has been Professor in the Department of Quality and Reliability of the Institute of Materials Engineering at the University of Kassel, Germany.

Dipl.-Ing. Tina Kirsten, born in 1990, studied Material Science at the Technical University of Dresden, Germany. After her diploma in 2014, she worked at the Fraunhofer Institute for Material and Beam Technology focusing on the fatigue behavior of metallic materials. Since 2015, she has been working as a research assistant characterizing the microstructural influence on the fatigue behavior of Al alloys at the Institute for Material Science at the Technical University of Dresden, Germany.

Prof. Dr.-Ing. Martina Zimmermann, born in 1966, studied Mechanical Engineering at the University of Siegen, Germany and obtained her PhD on the topic of fatigue behavior of welded aluminum structures in 2001. Between 2004 and 2012 she was senior researcher at the Institute for Materials Science at the University of Siegen and supervised the research field “Very High Cycle Fatigue”. As a research fellow she visited the University of Michigan, USA, from 2009 to 2010. Since 2012 she has been Professor of Mechanics of Materials and Failure Analysis at the Technical University of Dresden while at the same time being Division Head of the Competence Field Materials Characterization and Testing at the Fraunhofer Institute of Materials and Beam Technology in Dresden, Germany.

Dipl.-Wirt.-Ing. Fatih Bülbül, born in 1987, studied Business Engineering at the University of Siegen, Germany. After receiving his Diploma in 2015, he has been working as a research assistant focusing on the experimental and numerical study of the fatigue behavior of Al alloys in the Institute of Materials Engineering at the University of Siegen, Germany.

Prof. Dr.-Ing. Hans-Jürgen Christ, born in 1954, graduated from the University of Erlangen-Nürnberg, Germany, in 1980 and received a PhD at the same university in 1984 and his Habilitation in 1990. After a stay as Visiting Associate Research Professor at the University of Illinois at Urbana-Champaign, USA, he has been Full Professor of Materials Engineering at the University of Siegen, Germany, since 1993. The main objective of his research is the development of a detailed understanding of the behavior of metals and alloys under complex conditions representing those in technical service with respect to engineering materials. For this purpose, a correlation of microscopic processes with the resulting macroscopic changes in properties is used to obtain information on the relevant mechanisms and on damage processes.


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Published Online: 2019-03-26
Published in Print: 2019-04-04

© 2019, Carl Hanser Verlag, München

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