Acoustic Measurement of the Mechanical Properties of Thin Material Specimens

摘要

An acoustic technique is presented which permits accurate measurement of thedynamic Poisson's ratio, and the Young's, shear, and bulk moduli for a specimen which exists as a thin (<10 mil) layer. This technique should prove especially useful in situations where a bulk specimen is either not readily available or would not properly reflect the properties of the material when configured as a thin layer. The report includes a detailed discussion of the theory underlying the technique. As a test, three materials which could be easily formed into both a thin specimen and a thick specimen were selected. The technique was then used to determine the Poisson's ratio and acoustic velocities of the material constituting each thin specimen. These values were then contrasted to those of the bulk specimens obtained in a more conventional manner. The technique, as presented, could be extended for a number of applications, including the cure monitoring of adhesives. Acoustic Velocity, Poisson's Ratio, Adhesives, Thin Materials, Modulus, Ultrasound.