Innovative Ultrasonic Testing Facility for Fatigue Experiments in the VHCF Regime*

Stefan Heinz; Frank Balle; Guntram Wagner; Dietmar Eifler

doi:10.3139/120.110395

Article

Innovative Ultrasonic Testing Facility for Fatigue Experiments in the VHCF Regime^*

Stefan Heinz , Frank Balle , Guntram Wagner and Dietmar Eifler

Published/Copyright: May 26, 2013

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From the journal Materials Testing Volume 54 Issue 11-12

Abstract

At the Institute of Materials Science and Engineering of the University Kaiserslautern an ultrasonic testing facility was developed to perform fatigue tests in the VHCF regime. The individual design of the ultrasonic testing facility allows to control the process parameters and to measure relevant data with a frequency of up to 500 kHz in reasonable time. This permits a high-resolution measurement of the ultrasonic oscillation and the dissipated energy as well as a determination of microstructural reactions inside the specimens. With the described ultrasonic testing facility constant amplitude tests and load increase tests were carried out with the alloy Ti6Al4V. The results show that the innovative test and measuring techniques are best suited to describe the fatigue behaviour of Ti6Al4V. Additionally, for the first time high resolution 3D scanning laser vibrometry were carried out to determine the oscillation behaviour of specimens under ultrasonic cyclic load.

Kurzfassung

Am Lehrstuhl für Werkstoffkunde der Technischen Universität Kaiserslautern wurde eine innovative Ultraschall-Prüfeinrichtung für Zug-Druck-Beanspruchung entwickelt, die aufgrund ihrer Prüffrequenz von bis zu 500 kHz die Kontrolle der Prozeßparameter die Durchführung von Ermüdungsversuche im VHCF-Bereich in vertretbaren Zeiträumen ermöglicht. Diese Datenaufnahmerate von 500 kHz erlaubt hochaufgelöste Messungen der Ultraschallschwingungen sowie der Verlustenergie und der mikrostrukturellen Veränderungen innerhalb der Proben. Mit der beschriebenen Ultraschallprüfeinrichtung durchgeführte Ermüdungsuntersuchungen an Ti6Al4V im VHCF-Bereich zeigen das große Potenzial dieser neuartigen Prüf- und Messtechniken. Zudem wurde erstmalig die hochauflösende 3D-Scanning-Vibrometrie eingesetzt, um das Schwingverhalten der Ermüdungsproben während der Ultraschallermüdung zu analysieren.

Extended Version of the Contribution to VHCF 5

Stefan Heinz was born in 1982. He studied mechanical and process engineering at the University of Kaiserslautern, Germany, and received his diploma in 2008. Since 2008 Stefan Heinz is working at his Ph.D. thesis in the field of ultrasonic fatigue of Ti6Al4V at the Institute of Materials Science and Engineering of the University in Kaiserslautern, Germany.

Frank Balle is postdoctoral fellow at the Institute of Materials Science and Engineering of the University of Kaiserslautern, Germany. His main research topics are innovative solid state joining techniques for light metals. Furthermore he is active in ultrasonic techniques to characterize the monotonic and cyclic deformation behaviour of different alloys and composites. Balle holds a diploma in mechanical engineering (Dipl.-Ing./M.Sc.) and a Ph.D. (Dr.-Ing.) from the University of Kaiserslautern, Germany, in materials science. He has organized several symposia in the field of high power ultrasonic. Furthermore, Balle is associate editor of the international journal “Ultrasonics”.

Guntram Wagner was born in 1964. He studied mechanical engineering at the University of Kaiserslautern, Germany, and he received his doctor degree in 1996 with the subject “Ultrasonic welding of glass/glass- and glass/metal-joints“. Since 1997 he is working as senior scientist at the Institute of Materials Science and Engineering at the same university. His research fields are VHCF of light metals and pressure welding methods, especially friction stir welding and ultrasonic welding.

Dietmar Eifler got his Ph.D. from the University of Karlsruhe, Germany. From 1991 to 1994 he was professor at the University of Essen, Germany. Since 1994 he is professor at the Institute of Materials Science and Engineering at the University of Kaiserslautern, Germany. In 2008 he received the academy award of the Academy of Sciences and Literature Mainz, Germany. Since 2009 he is a member of the Berlin-Brandenburg Academy of Sciences and Humanities. In 2010 he was elected as a member of acatech — the National Academy of Science and Engineering. Current research activities are the cyclic deformation behaviour of metallic matallic materials as well as innovative joining techniques like ultrasonic welding and friction stir welding.

References

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Published Online: 2013-05-26

Published in Print: 2012-11-01

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https://doi.org/10.3139/120.110395