Development of a shock wave adhesion test for composite bonds by pulsed laser and mechanical impacts

18th APS-SCCM; 24th AIRAPT

Ecault, R.^1 ; Boustie, M.^2 ; Touchard, F.^3 ; Arrigoni, M.^2 ; Berthe, L.^3

Institut PPRIME, CNRS-ENSMA-Université de Poitiers, 1 Avenue Clément Ader, Futuroscope Chasseneuil

86961, France^1

ENSTA Bretagne, LBMS, 2 Rue François Verny, Brest Cedex 9

29806, France^2

PIMM, CNRS - Arts et Métiers ParisTech, 151 bd de l'Hôpital, Paris

75013, France^3

关键词: Adhesion test;    Aluminum projectiles;    Bonded composites;    Bonding quality;    Laser sources;    Mechanical impacts;    Mechanical qualities;    Stress generation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/11/112022/pdf
DOI  :  10.1088/1742-6596/500/11/112022

来源: IOP

【 摘 要 】

Evaluating the bonding quality of composite material is becoming one of the main challenges faced by aeronautic industries. This work aims to the development of a technique using shock wave, which would enable to quantify the bonding mechanical quality. Laser shock experiments were carried out. This technique enables high tensile stress generation in the thickness of composite bonds. The resulting damage has been quantified using different methods such as confocal microscopy, ultrasound and cross section observation. The discrimination between a correct bond and a weak bond was possible thanks to these experiments. Nevertheless, laser sources are not well adapted for optimization of such a test because of often fixed settings. That is why mechanical impacts on bonded composites were also performed in this work. By changing the thickness of aluminum projectiles, the generated tensile stresses by the shock wave propagation were moved toward the composite/bond interface. The made observations prove that the technique optimization is possible. The key parameters for the development of a bonding test using shock waves have been identified.