In situ x-ray phase-contrast imaging of spark erosion of aeronautical fasteners
Imagerie par rayons X en contraste de phase de l'étincelage des fixations aéronautiques
Résumé
In the context of lightning strike impacting aeronautical fasteners, we investigate the in situ behaviour of fasteners subject to a current level of a few kA by using high-speed Xray phase-contrast imaging in a synchrotron facility. It reveals that the fastener erosion occurs in two time scales. On a microsecond timescale, hot particles are ejected from cavity walls of the Carbon fibre reinforced polymer due to sparking/arcing phenomena, whereas on a sub-millisecond time scale, the fastener wall is vaporized due to the electrical energy deposited in the arc-fastener interface. The experimental observations have been used as input for an electro-thermal model of electric contact. The estimated vaporised depth is in good agreement with the measured one. The nature of the internal damages has been confirmed by using X-ray phase tomography.
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In Situ X-Ray Phase-Contrast Imaging of Spark Erosion of Aeronautical Fasteners.pdf (2.27 Mo)
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