Abstract
This paper discusses shear horizontal SH-coupled piezoelectric wafer active sensor (PWAS). The paper starts with a review of the state of the art in modeling SH transducers and their importance in non-destructive evaluation (NDE) and structural health monitoring (SHM). This is followed by basic sensing and actuation equations of shear-poled PWAS transducers. The free SH-PWAS electromechanical (E/M) impedance analytical models are presented, and compared with finite element models (FEM) and experiments. In this study, we extend the analytical development for constrained SH-PWAS bonded to structure on the form of beams. The model is based on normal mode expansion (NME) technique. The interaction between the SH-PWAS and the structure is studied. We developed closed-form equation of structure dynamic stiffness by coupling the mechanical response solution of the SH-PWAS to the structure elasticity solution. Finite element simulations and experiments matched well with analytical predictive model. Impedance spectroscopy is also used in NDE and SHM for composites. We present a predictive FEM for the E/M impedance of bonded SH-PWAS on cross ply GFRP as well as [0/45/45/0]s CFRP plates. The paper ends with summary, conclusion, and suggestions of future work.
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- D j :
-
Electric displacement vector (C/m2)
- d 35 :
-
Piezoelectric strain constant for shear mode (m/V) or (C/N)
- E j :
-
Electric field (V/m)
- e 35 :
-
Piezoelectric stress constant for shear mode (N/Vm)
- g 35 :
-
Piezoelectric voltage constant for shear mode (m2/C) or (Vm/N) or [(V/m)/Pa]
- S ij :
-
Strain tensor
- s D55 :
-
Mechanical shear compliance at zero electric displacement, D = 0 (m2/N)
- T kl :
-
Stress tensor (N/m2)
- γ :
-
Wave number (1/m)
- ε T jk :
-
Dielectric permittivity matrix at zero mechanical stress, T = 0 (F/m)
- ε S33 :
-
Dielectric permittivity in 33 direction measured at zero mechanical strain, S = 0
- ε T33 :
-
Dielectric permittivity in 33 direction measured at zero mechanical stress, T = 0
- K :
-
Electromechanical coupling factor
- μ :
-
Shear modulus (Pa)
- ω :
-
Angular frequency (rad/s)
- Introducing some relations:
-
\( {g}_{35}=\frac{d_{35}}{\varepsilon_{33}^T} \) \( \kern2.5em \frac{1}{\varepsilon_{33}^T}=\frac{1}{\varepsilon_{33}^S}-\frac{g_{35}^2}{s_{55}^D} \) \( {e}_{35}=\frac{d_{35}}{s_{55}^E} \) \( {\varepsilon}_{33}^T={\varepsilon}_{33}^S+{d}_{35}{e}_{35} \) \( \frac{\varepsilon^S}{\varepsilon^T}=\frac{s^D}{s^E}=1-{K}^2 \) \( \frac{e_{35}}{\varepsilon_{33}^S}=\frac{g_{35}}{s_{55}^D} \) \( {K}_{35}^2=\frac{d_{35}^2}{s_{55}^E{\varepsilon}_{33}^T}=\frac{e_{35}^2{s}_{55}^D}{\varepsilon_{33}^S} \)
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Acknowledgements
This work was supported by Air Force Office of Scientific Research grant #FA9550-11-1-0133, program manager Dr. David Stargel; and the Office of Naval Research grant #N00014-11-0271, program manager Dr. Ignacio Perez.
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Kamal, A., Giurgiutiu, V. (2015). Characterization of Shear Horizontal-Piezoelectric Wafer Active Sensor (SH-PWAS). In: Tandon, G. (eds) Composite, Hybrid, and Multifunctional Materials, Volume 4. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-06992-0_3
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