Product Code: ICAL05_P556

2D Effects During the Propagation of Shock-Wave Induced by Laser Plasma Application for Laser Adherence Test (LASAT)
Authors:
Cyril Bolis, CNRS/LALP; Arcueil France
Laurent Berthe, Laboratoire pour l'Application des Lasers de Puissance -UPR CNRS 1578; Arcueil France
Michel Arrigoni, laboratoire de Combustion et de dnique; Futuroscope France
Michel Boustie, Laboratoire de Combustion et de Dnique; Futuroscope France
Michel Jeandin, Ecole des Mines de Paris; Evry France
Sophie Barradas, Ecole des Mines; Evry France
Presented at ICALEO 2005

This paper presents new results concerning the LASAT technique (LASer Adhesion Test) developed in order to become a non-intrusive bond strength test for coatings. This technique consists in irradiating target (substrate+coatings) with a laser in GW/cm2 range to generate high-pressure shock wave (GPa) which the propagation can lead to tensile at the interface and debonding.
Using numerical simulations (RADIOSS), 2D mechanical effects induced at laser spot edges have been studied. Results show that during the propagation in material, a tensile wave is generated behind the main compressive shock. According to the laser spot diameter, these tensile waves converge along the axis at a well identified depth. The main shock wave is attenuated and/or the interface coating-substrat can be debonded by the 2D tensile wave. Experimental validation has be done using pure Al target and Cu thermal spraying coating on Al substrat. Velocity temporal profile measured by Doppler Velocimetry technique are in good agreement with calculation in both configurations. New perspectives are open with the 2D-LASAT test for massive target and so, new industrial applications.