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Endommagements maitrisés par choc laser symétrique et désassemblage des collages

Abstract : New challenges come with the increasing use of composite materials and their assembly. To be qualified to fly, the material integrity needs to be assessed by means of Non-Destructive Testing (NDT). However, the lack of reference standards with real delamination holds back the development of automatized defect detection. Moreover, there is no selective disassembly process which does not involve the use of chemical solvents. The use of the LASer Adhesion Test (LASAT) for the creation of controlled damages and disassembly of bonded composites is a promising method. This PhD focuses on mastering and optimizing those two processes via shock wave control. We study the creation of shock waves with plasma expansion, their propagation into the material, and creation of stress zones at the desired position. Our study of laser matter-interaction enables plasma characterization and extraction of temporal pressure profiles for a large choice of laser parameters. The experimental characterization of composite materials under laser shock with different additional layers is detailed together with a numerical evaluation of the strain transmitted to the target. Work on damage detection and measurements was done with the use of several techniques (X-ray Computed Tomography, Ultrasonic testing and transversal microscopic observation). Finally, the process capabilities were shown by the disassembly of titan/composite bond and the creation of a plane shaped delamination into a composite.Keywords : Laser shock, Laser-matter interaction, Controlled damages, Non Detructives Testing, Desassembly.
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Submitted on : Wednesday, June 1, 2022 - 9:47:16 AM
Last modification on : Saturday, August 6, 2022 - 3:07:58 AM
Long-term archiving on: : Friday, September 2, 2022 - 6:18:58 PM

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  • HAL Id : tel-03683962, version 1

Citation

Marine Scius-Bertrand. Endommagements maitrisés par choc laser symétrique et désassemblage des collages. Mécanique des matériaux [physics.class-ph]. HESAM Université, 2021. Français. ⟨NNT : 2021HESAE063⟩. ⟨tel-03683962⟩

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