Inicio  /  Applied Sciences  /  Vol: 14 Par: 7 (2024)  /  Artículo
ARTÍCULO
TITULO

Delamination Assessment in Composite Laminates through Local Impulse Excitation Technique (IET)

Carlo Boursier Niutta    
Pierpaolo Padula    
Andrea Tridello    
Marco Boccaccio    
Francesco Acerra and Davide S. Paolino    

Resumen

This paper deals with an innovative nondestructive technique for composites (local-IET), which is based on the Impulse Excitation Technique (IET) and, in the presence of damage, assesses the degradation of the elastic properties of a local region of the laminate by reversibly clamping its boundaries. In this paper, a numerical analysis of the sensitivity of the local-IET to the delamination damage mechanism is conducted. Firstly, a Finite Element (FE) model of the local-IET test is determined through experimental investigations on undamaged composite laminates, which cover a wide range and are made of glass or carbon fibers, through resin infusion or pre-preg consolidation and with unidirectional or fabric textures. The vibrational response of a glass fiber composite with local delamination is then assessed with the local-IET. By modeling the delamination in the simulation environment, the effectiveness of the FE model in replicating the vibrational response, even in the presence of delamination, is shown through a comparison with the experimental results. Finally, the FE model is exploited to perform a sensitivity analysis, showing that the technique is able to detect the presence of delamination.

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