Structural Health Monitoring of Advanced Composites Using Guided Waves. Online Monitoring of Defects/Discontinuities in Advanced Composite Structures using Ultrasonic Guided Waves and PZTs

      Аннотация: This book explains theoretical, numerical, and experimental procedures for the structural health monitoring (SHM) of advanced sandwich composites, such as honeycomb composite sandwich structure. These structures are extensively used in aerospace, aeronautics, marine and automotive industries. But, these structures are prone to disbonds at the skin-core interphase, and the high-density core (HD-core) sections are often introduced inside the soft-core in order to provide localized support. It is essential to clearly identify those unknown HD-core regions and hidden disbonds in such kind of structures. The in-situ inspection methods are considered here, which do not require dismantling of the larger structure. This book mainly focuses on the development of ultrasonic guided wave propagation based active SHM frameworks to identify such hidden disbonds and HD-core regions in sandwich structures using piezoelectric transducers.

Ключевые слова: frequency, Group Velocity, Stress, Complex constants, Phase velocity, Longitudinal wave speed, Shear wave speed, Wave number, Vertical propagation vectors, Thickness of the layer, Vertical wavenumbers, Mass density, Poisson's ratio, Stress displacement vector, Fundamental anti-symmetric mode, Fundamental symmetric mode, Higher order anti-symmetric mode, Higher order symmetric mode, Constant factor, Small scaling parameter, guided wave, nondestructive testing, sandwich structure, structural health monitoring, honeycomb composites, dispersion curve, signal difference coefficient, high-density core, disbond