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The purpose of this work is to develop a reliable, quantitative method to determine the basic adhesion of substrate/coating interfaces. The laser spallation technique involves impinging a high-energy laser pulse of a few nanoseconds duration on the backside of the substrate, which is coated by a thin film of absorbing material. The incident laser radiation is converted rapidly to thermal energy and the explosive evaporation of the absorbing material, sandwiched between the substrate and a fused quartz confining plate, sends a compressive shock wave through the substrate toward the material interface. This in turn is reflected from the coating free surface, giving rise to a tensile wave, which may lead to spallation at the interface. The primary processes of such an experiment are the laser/target interaction whereby the latter is transformed from solid to liquid, vapour and plasma states leading to the generation of a stress wave, propagation of the stress wave and finally spallation of the material interface.

Additional information

Bibliographic Reference: Article: Journal of the Mechanics of Composite Materials and Structures (1997)
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