Start Date

2016 12:00 AM

Description

Stiffeners are widely used in aircraft structures to increase the structural stiffness. This paper explores the feasibility of using feature guided waves (FGW) for rapid screening of the bond-line between a stiffener and a carbon-fiber-reinforced-polymer (CFRP) composite panel. Such FGW is capable to concentrate the energy along the stiffener and bond-line, with little energy leaking into the plate. Semi-Analytical Finite Element (SAFE) method is applied to understand the modal properties of FGWs that exist in the structure, using both the homogeneous and the heterogeneous model for the composite panel. Promising modes with little dispersion and less little attenuation are identified from the modal analysis. 3D Finite Element models are performed to simulate the propagation of selected FGWs in the stiffened plate, and their interaction with defects in the adhesive bond-line. The scattering from defects with different sizes are analyzed using signals monitored along the stiffener. Preliminary experiments are carried out to validate the modeling results, showing good agreements.

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Feature Guided Wave Inspection of a Bond-Line Between a Stiffener and a Composite Plate

Stiffeners are widely used in aircraft structures to increase the structural stiffness. This paper explores the feasibility of using feature guided waves (FGW) for rapid screening of the bond-line between a stiffener and a carbon-fiber-reinforced-polymer (CFRP) composite panel. Such FGW is capable to concentrate the energy along the stiffener and bond-line, with little energy leaking into the plate. Semi-Analytical Finite Element (SAFE) method is applied to understand the modal properties of FGWs that exist in the structure, using both the homogeneous and the heterogeneous model for the composite panel. Promising modes with little dispersion and less little attenuation are identified from the modal analysis. 3D Finite Element models are performed to simulate the propagation of selected FGWs in the stiffened plate, and their interaction with defects in the adhesive bond-line. The scattering from defects with different sizes are analyzed using signals monitored along the stiffener. Preliminary experiments are carried out to validate the modeling results, showing good agreements.