Utilization of acoustic emission in scratch test evaluation

0452829 - FZÚ 2016 RIV CH eng C - Konferenční příspěvek (zahraniční konf.)
Tomáštík, J. - Čtvrtlík, Radim - Boháč, Petr - Dráb, M. - Koula, V. - Cvrk, K. - Jastrabík, Lubomír
Utilization of acoustic emission in scratch test evaluation.
Key Engineering Materials, Vol. 662. Pfafficon: Trans Tech Publications Ltd, 2015 - (Kovalčíková, A.; Lofaj, F.), s. 119-122. ISBN 978-3-03835-555-7. ISSN 1013-9826.
[Conference on Local Mechanical Properties (LMP 2014) /11./. Stará Lesná (SK), 12.11.2014-14.11.2014]
Grant CEP: GA TA ČR TA03010743
Institucionální podpora: RVO:68378271
Klíčová slova: acoustic emission * scratch test * thin films
Kód oboru RIV: JK - Koroze a povrchové úpravy materiálů

The scratch test is a well-established instrumental method for assessment of the cohesive-adhesive parameters of thin films and coatings. Its evaluation is classically performed using the microscopic analysis of residual scratch and the indenter depth-change record. However, these analysis methods can be insufficient for detection of the very first film-to-substrate adhesion failures. To overcome this difficulty, an independent method of detection of acoustic emission signals can be employed. The detection system of acoustic emission, developed in our laboratory, utilizes a special holder and continuous recording during the whole scratch test. The piezoelectric sensor with 2 MHz sampling rate and sophisticated software allow a thorough post-process analysis of recorded acoustic emission signal. Failure events can be observed on microsecond scale and their frequency spectra can be evaluated.
Trvalý link: http://hdl.handle.net/11104/0253734