Determination of the flexural modulus of thin films from measurement of the first arrival of the symmetric Lamb wave

1991/09/23 by Sarah E. Bobbin, J. W. Wagner, James W. Wagner +1
Engineering · #Adhesion, Friction, and Surface Interactions #Composite material #Flexural modulus #Flexural strength #Interferometry #Lamb waves #Laser Material Processing Techniques #Materials science #Metal and Thin Film Mechanics #Modulus #Optics #Physics #Thin film #Wave propagation

paper · doi:10.1063/1.106277

openalex publication_date 1991/09/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/26

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.

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