Abstract
Surface focused scanning acoustic microscopy with phase contrast in the transmission mode has been employed to determine the mechanical respectively elastic properties of functionally graded materials. Time selective signal acquisition adjusted to the minimum path length in the sample allows the determination of the velocity of acoustic waves averaged over the path of the acoustic beam with a lateral resolution in the vicinity of the wavelength of the ultrasonic waves. Measurements are performed for longitudinal and transversal modes accessible by mode conversion at the interfaces between sample and coupling fluid. This allows the spatially resolved determination of the attenuation, the velocity of ultrasonic waves and the Poisson ratio. From an independent determination of the spatial variation of the density or from the averaged density and adequate modelling the Young's modulus and the shear modulus can also be derived from the data. The method is demonstrated for selected applications concerning functionally graded materials.
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