Abstract
Carbon fiber reinforced polymer (CFRP) composites are lightweight and an increasingly used material with good mechanical properties. In the aviation industry, they are also required to have specific electrical properties that guarantee resistance to the direct and indirect lightning effects. The paper is focused on the description of a test stand and development of a method used to determine the electrical characteristics of conductive CFRP laminate samples with the use of high current impulses of lightning nature. Samples of three laminates (square format with side 30 × 30 cm) with a different composition were tested on the constructed stand, confirming the possibility of characterizing this type of laminate sample in terms of electrical conductivity and resistance to the effects of lightning current. It was possible to observe the impulse current flow (with a peak value up to 15 kA and a rise time above 6 µs) from the high voltage electrode placed in the center of the sample in all directions towards the edge. The optical fiber measuring system was used to record the voltage and current time waveforms. The energy stored in the impulse current generator was sufficient to simulate the mechanical damage, such as burnout and delamination, that accompanies the direct lightning strike to structural elements made of CFRP. The influence of the matrix composition used for laminate fabrication on the test results describing the electrical properties of the tested CFRP samples was noted. The experimental setup allows the testing of specimens with a maximum width and length of 50 × 50 cm and any thickness with a peak current of up to 50 kA.
Highlights
Academic Editors: Lubomir Bena, Damian Mazur and Department of Electrical and Computer Fundamentals, Rzeszow University of Technology, ul
The resistance of composite samples allows their electrical conductivity to be computed. This parameter enables the prediction of the behavior of a particular material for different peak values or types of lightning current
2), which manifested itself in a significant rical tape arrangement, which manifested itself in a significant variation in the peak values of the observed currents
Summary
A constant improvement and development of aircraft materials is among the most important activities of engineers Promising in this field are composite elements [1–9]. The first, a stroke-type lightning current, having peak values of several tens of kiloampers and rising times of less than microsecond, is responsible mainly for electrical and mechanical effects of lighting [24]. The resistance of composite samples allows their electrical conductivity to be computed This parameter enables the prediction of the behavior of a particular material for different peak values or types of lightning current. This paper is focused on the construction of a prototype test stand for developing of a measurement method that enables the determination of the electrical parameters of conductive composites during high-current tests. The new proposal allows, among other features, the parallel acquisition of a voltage and the corresponding current waveforms during the conducted tests
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