Determination of the flexural modulus of thin films from measurement of the first arrival of the symmetric Lamb wave
- 23 September 1991
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 59 (13), 1544-1546
- https://doi.org/10.1063/1.106277
Abstract
A technique is presented to measure the flexural modulus of free-standing thin metallic films from 1 to 25 μm thick. Lamb waves are excited in the film with a pulsed Nd:YAG laser, and detected using heterodyne interferometry. Variability in wave-form structure is observed as a function of experimental parameters and film thickness. The first arrival of the symmetric Lamb mode can be unambiguously identified regardless of wave-form shape, and is used to calculate the flexural modulus.Keywords
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