Barely visible impact damage identification in a 3D core sandwich structure

Shirsendu Sikdar; Wiesław Ostachowicz; Paweł Kudela; Maciej Radzieński

doi:10.24423/cames.187

Shirsendu Sikdar Institute of Fluid-Flow Machinery, Polish Academy of Sciences
Wiesław Ostachowicz Institute of FluidFlow Machinery, Polish Academy of Sciences
Paweł Kudela Institute of FluidFlow Machinery, Polish Academy of Sciences
Maciej Radzieński Institute of FluidFlow Machinery, Polish Academy of Sciences

DOI: http://dx.doi.org/10.24423/cames.187

Abstract

3D core sandwich structure (3DCSS) is a popular lightweight construction material in the automotive, aerospace and marine industries. However, barely visible low-speed impact-damage (BVLID) may occur in the 3DCSS due to foreign-object-impact that can significantly reduce the load-bearing capacity of the structure. This paper presents a guided wave (GW) propagation based BVLID identification technique for the 3DCSS. A global-matrix formulation based semi-analytical model is applied to generate the dispersion curve for the GW propagation in the 3DCSS. It is observed that the GW propagation in the 3DCSS is multi-modal in nature. Finite-element numerical simulation of GW propagation in the 3DCSS is carried out in Abaqus. A significant increment in the primary antisymmetric mode is noticed due to the presence of BVLID region in the structure. Experiments are then conducted on a 3DCSS sample to validate the simulation results. There is a good agreement between the simulation and experimental results in all the cases.

Keywords

3D core sandwich structure, dispersion curve, barely visible impact damage, guided wave,

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