Kisoo K., Choi M., Kim K.

Various testing technique to determine the properties of film material have been investigated such as Nano indentation test, Bulge test, Micro tensile test and so on. They each have strength and weakness in the preparation of test specimen and the analysis of experimental result. Recently, optical techniques have been developed for measuring mechanical properties. Among these methods, an effective technique is the use of a cantilever beam load by various means. The study proposes the elastic modulus evaluation technique of a cantilever beam by vibration analysis based on time-average electronic speckle pattern interferometry (TA-ESPI) and Euler-Bernoulli equation of cantilever beam. Elastic material properties critically affect the vibration behavior of structures. The observation can be inverted, leading to the idea that the vibration behavior of a particular material can be used to determine the material's elastic properties. The principle is the foundation of all vibration-based identification methods which used the Euler-Bernoulli beam theory to link the elastic modulus with the specimen's natural frequency.