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

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Chapter 5

Elastic Waves

This chapter presents a review of elastic wave propagation in elastic media. The chapter adopts an incremental step-by-step approach to the description and presentation of the wave propagation problem, which can become quite complicated in some cases. The chapter starts with the discussion of the simplest case of wave propagation – the study of the axial waves propagating in a straight bar, which is used to develop fundamental principles of wave propagation, such as: wave equation and wave speed; d’Alembert (generic) solution and separation of variables (harmonic) solution; the contrast between wave speed and particle velocity; acoustic impedance of the medium; the wave propagation at material interfaces. The concept ...

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