NDLI: A.: Modeling of wedge-shaped anisotropic piezocomposite transducer for guided wave-based structural health monitoring

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A.: Modeling of wedge-shaped anisotropic piezocomposite transducer for guided wave-based structural health monitoring

Content Provider	CiteSeerX
Author	Salas, Ken I. Cesnik, Carlos E. S. Raghavan, Ajay Area, A.
Description	The guided wave (GW) field excited by a wedge-shaped, anisotropic piezocomposite transducer (APT), surface-bonded on an isotropic substrate is investigated with applica-tions to large area structural health monitoring (SHM). It is shown that this configuration is significantly more efficient than conventional designs in terms of electric current drawn to induced displacement amplitudes. The analysis is based on the three-dimensional equa-tions of elasticity, and the solution yields analytical expressions for the field variables in three separate spatial regions determined by the location of the transducer’s radial edges. In this study, the dynamics of the substrate and transducer are assumed uncoupled, and their interaction is modeled through surface tractions along the transducer’s edges. The excitation modes considered are harmonic and a Hann-modulated toneburst. A similar problem is modeled using three-dimensional finite element simulations, to assess the spa-tial and transient accuracy of the analytical solution. The results show good agreement over a wide range of radial and azimuthal positions, as well as good time resolution. The result-ing expressions are used to identify optimal harmonic excitation frequencies and actuator dimensions. The response of a wedge-shaped APT sensor and a rectangular piezoelec-tric sensor under the guided wave field excited by a wedge-shaped APT actuator is also investigated.
File Format	PDF
Language	English
Publisher Institution	48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 23 - 26 April 2007
Access Restriction	Open
Content Type	Text
Resource Type	Article

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