3-D voltage model for detection of sound radiated from anisotropic materials

Lobkis, O. I.; Chimenti, D. E.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1127
Academic Journal
The elastic behavior of anisotropic composite materials has been characterized experimentally by employing a 3-D transducer voltage model to calculate signals in sound radiation experiments using either air or liquid coupling. It is found that with sound air-coupled propagation along material symmetry directions, integration over the incident-plane angle alone is sufficient to predict the transducer voltage accurately, where the dependence of the diffraction integral on the out-of-incident-plane angle is evaluated asymptotically. In general, material directions, however, a full 3-D transducer voltage calculation is generally necessary to account for out-of-plane, angle-dependent variations in the scattering coefficients that yield asymmetrical dependence on the out-of-plane angle. Modeling these effects is especially critical to an accurate determination of viscoelastic material properties. In symmetry directions the real parts of the elastic stiffness are much less sensitive to 3-D beam effects. In liquid-coupled experiments we show that out-of-plane coupling from 3-D beam effects can be used to infer accurately C[44], the stiffness related to the slow shear wave, a completely counterintuitive result. The reason lies in the residual coupling to SH waves along symmetry directions and the high radiation damping of water, the immersion liquid. © 2000 American Institute of Physics.


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