Abstract
Metallic parts of aircrafts that are used for fuel tanks areas or even for the fuselage can suffer from severe direct damage due to lightning strikes. Laboratory tests imitating lightning strikes follow standard regulations requirements that prescribe the current waveforms the structure must resist depending on the zone of the airplane. D+B+C* current waveforms are under concern here and are reproduced in by specific current delivery devices at DGA-Ta lightning lab. The present paper points out that in some cases, tests considered as identical from the standard regulation point of view can generate different damages in the plate, and even variability in perforation apparition. This paper proposes a damage severity index (DSI) that allows considering in an intrinsic manner the effect of the testing parameters related to the current waveform or from the sample modification. The analysis of the tests exhibits a threshold over which a critical crater occurs and the risk of perforation is maximal. We use the DSI to perform a sensitivity analysis on a small data set of lightning tests and quantify the positive or negative effects of significant current waveform or sample input parameters.
Highlights
One of the main safety issues facing aircrafts is the protection against lightning strikes
This paper considers the problem of the variability of the damage forms obtained from lightning strike tests done on metallic panels under the same general standards
The current waveform used to imitate lightning strikes is the D+B+C* current waveforms reproduced by specific current delivery devices at DGA-Ta lightning lab
Summary
One of the main safety issues facing aircrafts is the protection against lightning strikes. Metallic aircrafts are protected against current flows because of their high electrical conductivity. At the arc attachment location, a serious damage may happen and even it may be developed into a perforation. Such perforation in the fuel tanks or close to the energetic materials may jeopardize the safety of the aircraft and the holding of the carriers. For military aircrafts, this will result in the cancellation of the mission, or even the loss of the aircraft. Studying the damage effect of lightning strikes on metallic aircrafts is of major importance
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