Why monitor acoustic emissions during nanomechanical tests?

0537579 - FZÚ 2021 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Čtvrtlík, Radim - Václavek, L. - Tomáštík, J.
Why monitor acoustic emissions during nanomechanical tests?
Acta Polytechnica CTU Proceedings. Vol. 27. Prague: Czech Technical University in Prague, 2020, s. 126-130. ISBN 978-80-01-06735-2. ISSN 2336-5382.
[International Conference on Local Mechanical Properties /14./. Prague (CZ), 06.11.2019-08.11.2019]
Institucionální podpora: RVO:68378271
Klíčová slova: acoustic emission * indentation * scratch test * thin films
Obor OECD: Optics (including laser optics and quantum optics)

Acoustic Emissions (AE) monitoring has been proved as an effective non-destructive technique at the macro scale. Nevertheless, it may also be employed at nano/micro scale during nanomechanical and nanotribological testing. Local mechanical properties of surfaces or micro object are routinely explored using nanoindentation, scratch test or dynamic impact tests that are evaluated based on analysis of depth-load-time records or microscopic observation of residual indents, scratch grooves or impact craters, respectively. Although these approaches have been proven to be sufficient in most cases for a variety of materials, there are many situations where they do not provide sufficient information for a complex understanding of the deformation response. On the other hand, analysis of AE signals generated during these tests may provide valuable complementary information and provide some insight into the dynamics of phenomena like cracking, phase transitions, plastic instabilities, etc.

Trvalý link: http://hdl.handle.net/11104/0315401