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Comportement de composites sous choc induit par laser : développement de l'essai d'adhérence par choc des assemblages de composites collés

Abstract : Laser driven shock waves yields to dynamic traction stress that is able to test interface adhesion and to detect weak bond. This work is dedicated to extend the process to composite laminates and their bonded assemblies, involved in a large industry field, such as aeronautic or defense. Composite material behavior under shock, interface strength characterization and induced delamination are a key issue of this study. Experiments are achieved on high power laser facilities with a wide range of pulse duration (from fs to ìs) to position the maximum traction stresses at the interface. Tests were instrumented with real time diagnostics: Doppler velocimetry of the free surface and transverse shadowgraphy. Post shock recovered samples are analyzed with different techniques (SEM, tomography, ultrasonic, DSC...) to identify delamination in relation to material properties. Results are supported with numerical simulation to describe the material behavior. Main result of this study is the ability of the technique to differentiate the strength of the assemblies.
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Contributor : Elise Gay <>
Submitted on : Tuesday, February 7, 2012 - 10:28:16 PM
Last modification on : Friday, October 23, 2020 - 4:50:54 PM
Long-term archiving on: : Tuesday, May 8, 2012 - 2:40:44 AM

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  • HAL Id : tel-00667560, version 1

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Elise Gay. Comportement de composites sous choc induit par laser : développement de l'essai d'adhérence par choc des assemblages de composites collés. Mécanique des matériaux [physics.class-ph]. Ecole nationale supérieure d'arts et métiers - ENSAM, 2011. Français. ⟨NNT : 2011ENAM0033⟩. ⟨tel-00667560⟩

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