Reconstruction of Elastic Constants from Ultrasonic Reflectivity Data in a Fluid Coupled Composite Plate

Genetic Algorithms for Inversion of Ultrasonic Data for the Elastic Constants Measurement in Orthotropic Material Systems

“…Inversion of leaky Lamb wave [5,6] and bulk wave data [7,8,9,10,11] from immersion techniques are by far the most popular.and reported. In most cases, either the Simplex algorithm or a classical gradient technique (for example, the Newton-Raphson method) has been used for the inversion of an overdetermined data set.…”

Application of Coupled Ultrasonic Plate Modes for Elastic Constant Reconstruction of Anisotropic Composites

“…We will also demonstrate that transmission coefficient data may be used efficiently for reconstruction of the composite elastic constants. We will show that this method gives excellent results for some elastic constants which are difficult to measure from reflectivity spectra [5] and therefore experimental data on both reflection and transmission minima give important supplemental information.…”

“…Interest in the RC zeroes (maxima of the transmission coefficient) arose originally from their association with the leaky Lamb waves in the plate which is valid only for low fluid densities [4]. Independently of the physical meaning of the RC zeroes the spectrum carries important information on the properties of the composite and may be used for reconstruction of the elastic constants from the experimental data [5,6].…”

Ultrasonic guided waves in composite plates: a study of interface bond condition and material properties determination with broadband focused air-coupled ultrasounds

“…The separation of the extrinsic contributions of different geometric elements such as transducer size, location, and focal length from intrinsic material properties in the received voltage expression has been shown by Lobkis et al [63], [64]. Another critical contribution was made by Rohklin and Chimenti [84], who demonstrated that specific areas of the guided wave modes of a plate have their predominant influence on different elastic stiffnesses.…”

“…Even though the study of the disper sion curves and attenuation of the Rayleigh-Lamb waves is well established, only few attempts have been made to exploit these characteristics in producing scans of the in ternal defects, discontinuities, and interfacial disbonding [21], [74], [10], [84], [72], [86].…”