Abstract
One of the axioms of structural health monitoring states that the severity of damage assessment can only be done in a learning mode under the supervision of an expert. Therefore, a numerical analysis was conducted to gain knowledge regarding the influence of the damage size on the propagation of elastic waves in a honeycomb sandwich composite panel. Core-skin debonding was considered as damage. For this purpose, a panel was modelled taking into account the real geometry of the honeycomb core using the time-domain spectral element method and two-dimensional elements. The presented model was compared with the homogenized model of the honeycomb core and validated in the experimental investigation. The result of the parametric study is a function of the influence of damage on the amplitude and energy of propagating waves.
Highlights
Honeycomb Sandwich Composites (HSCs) are a type of multi-layered structure that are composed of the mid-core with the geometry of honeycomb sandwiched between thin skins
The compact piezoelectric transducers (PZT) can be surface-bonded to the inspected structure or even embedded between the composite plies so that the measurements can be conducted in situ
The parametric study conducted in the paper leads to the determination of a modelassisted damage identification function (MADIF), which defines the influence of the size of the composite defect on wave propagation
Summary
Honeycomb Sandwich Composites (HSCs) are a type of multi-layered structure that are composed of the mid-core with the geometry of honeycomb sandwiched between thin skins. To the best of the authors’ knowledge, the present model has not been implemented yet for HSCs. The parametric study conducted in the paper leads to the determination of a modelassisted damage identification function (MADIF), which defines the influence of the size of the composite defect on wave propagation. The parametric study conducted in the paper leads to the determination of a modelassisted damage identification function (MADIF), which defines the influence of the size of the composite defect on wave propagation In this case, the defect is assumed to be a disbond between the skin and the core. The general concept of the SEM is based on the idea of the FEM The similarity of both methods lies in the fact that the modelled domain is divided into non-overlapping finite elements, and external forces and arbitrary boundary conditions are imposed in the particular nodes. ∂ζ where e φ is a nodal voltage of the transducer
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