Abstract
The damage induced by lightning strikes in carbon-fiber-reinforced plastic (CFRP) laminates with fasteners is a complex multiphysics coupling process. To clarify the effects of different lightning current components on the induced damage, components C and D were used in simulated lightning strike tests. Ultrasonic C-scans and stereomicroscopy were used to evaluate the damage in the tested specimens. In addition, the electrothermal coupling theory was adopted to model the different effects of the arc and the current flowing through the laminate (hereinafter referred to as the conduction current) on CFRP laminates with fasteners under different lightning current components. Component C, which has a low current amplitude and a long duration, ablated and gasified the fastener and caused less damage to the CFRP laminate. Under component C, the heat produced by the arc played a leading role in damage generation. Component D, which has a high current amplitude and a short duration, caused serious surface and internal damage in the CFRP laminate and little damage to the fastener. Under component D, the damage was mainly caused by the Joule heat generated by the conduction current.
Highlights
Carbon-fiber-reinforced plastics (CFRPs) have excellent mechanical properties and are widely used in various industries [1,2,3]
Comparing their results with ours, it damage of CFRP laminates without fasteners under components D and C. Comparing their results can be found that there is a significant difference in damage between CFRP laminates without fasteners with ours, it can be found that there is a significant difference in damage between CFRP laminates and CFRP laminates with fasteners with the same lightning current components
For CFRP laminates without fasteners, the results showed that the Joule heat effect and the arc heat
Summary
Carbon-fiber-reinforced plastics (CFRPs) have excellent mechanical properties and are widely used in various industries [1,2,3]. In structural design, depending on the excellent formability of composite materials, the number of fasteners can be reduced by optimizing the design; completely eliminating the need for fasteners is difficult. These fasteners have greater electrical conductivity than the other materials in CFRP laminates. The temperature and air pressure inside the fastener hole will change dramatically during the lightning strike [10], which leads to damage around the hole, loss of fastener support, and weakening of the mechanical and electrical properties of the
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