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A simulation of a focused beam of surface wave motion generated by a line array of surface wave transducers is used to calculate the field scattered back from a surface-breaking crack. The backscattered field is expressed in terms of a scattering coefficient, which is derived from the reciprocal...
The level of nonlinearity in the elastic response of materials containing structural damage is far greater than in materials with no structural damage. This is the basis for nonlinear wave diagnostics of damage, methods which are remarkably sensitive to the detection and progression of damage...
The presence of mesoscopic features and damage in quasi-brittle materials causes significant second-order and nonlinear effects on the acoustic wave propagation characteristics. In order to quantify the influence of such micro-inhomogeneities, a new and promising tool for nondestructive material...
We demonstrate that electronic shearography with thermal loading can be effectively applied to the nondestructive detection of debonds in thick polyurethane/ steel structures usually employed in the hulls of military ships. A compact fiber-optics shearographic interferometer has been developed...
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