Comparison of composite material degradation assesment methods using acoustic analysis and laser vibrometry

0381307 - ÚTAM 2013 RIV CZ eng C - Conference Paper (international conference)
Urushadze, Shota - Šperl, Martin - Kytýř, D. - Valach, J. - Fíla, T.
Comparison of composite material degradation assesment methods using acoustic analysis and laser vibrometry.
Engineering Mechanics 2012. Prague: ITAM AS CR, v. v. i., 2012 - (Náprstek, J.; Fischer, C.), s. 58-59. ISBN 978-80-86246-39-0.
[Engineering mechanics 2012 - International conference /18./. Svratka (CZ), 14.05.2012-17.05.2012]
R&D Projects: GA ČR(CZ) GAP105/10/2159
Institutional support: RVO:68378297
Keywords : natural frequency * material degradation * laser vibrometer
Subject RIV: JI - Composite Materials

Assessment of degradation rate of material can be carried out by many experimental techniques differing in complexity and sophistication. A relatively simple method based on acoustic analysis is described in this contribution. Degradation of material’s properties due to fatigue loading is detectable in decrease of their modulus of elasticity that can be derived from natural frequencies of specimens. These measurements utilize self-designed device capable of specimen excitation and acquisition of its vibration. The recorded signal is then processed by spectral analysis enabling determination of natural frequencies. Usefulness of the above mentioned acoustic method can be seen in the fact that the measured changes of material’s parameters are comparable to those obtained by laser vibrometry, which is by several orders more expensive technique.
Permanent Link: http://hdl.handle.net/11104/0211808