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Structural Health Monitoring with Piezoelectric Wafer Active Sensors, 2nd Edition by Victor Giurgiutiu

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Chapter 8

Coupling of PWAS Transducers to the Monitored Structure

This chapter analyzes how surface-mounted PWAS transducers couple with the structure through the bonding adhesive. Shear layer analysis is conducted for 1-D linear PWAS transducers and for 2-D circular PWAS transducers. Closed-form solutions for the shear lag distribution are derived. Effective pin-force and line-force models that simplify the analysis are established for 1-D and 2-D, respectively. These models yield an effective PWAS size that it is usually smaller than the physical PWAS size due to transmission losses in the shear layer. Ideal bonding conditions in which the shear layer is either very thin or very stiff (or both) are also studied. The chapter shows that, for ...

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