A Novel Method to Measure Lightning-Current-Induced Impact Force on Laminated CFRP Composites

In order to evaluate the mechanical effect of lightning strike on the carbon fiber reinforced polymer (CFRP) laminates, a novel measuring device that takes advantage of the polyvinylidene fluoride (PVDF) piezoelectric sensor was established. It was verified that this device could measure the dynamic impact force validly in the strong electromagnetic environment during a lightning strike. The influence of current amplitude on CFRP damage behavior was explored. The experimental results showed that the maximum impact force increased with the augment of current amplitude. Increasing the lightning current exacerbated the damage degree of CFRP laminates and made the mechanical damage mode more complicated. The obtained data provide scientific support for the analysis of lightning damage behavior of CFRP composites. Moreover, it provided a theoretical basis for the development and design of lightning protection solutions for aircraft.