Abstract
In recent years, penetrating weapons have been used more and more to attack increasingly hard targets; therefore, the impact of such a penetrating process has increased to an extremely high level. As an important component of a fuze, the reliability of the ceramic capacitor in high-impact environments is key for the normal working of the fuze. In this paper, we found that a high-impact causes parameter drift of the multilayer ceramic capacitor (MLCC), which further causes the fuze to misfire. This paper mainly studies the internal mechanism of the MLCC’s parameter drift during high impact. Firstly, transient physical phenomena, such as capacitance fluctuation and the leakage current increase of the ceramic capacitor under a high acceleration impact, were studied experimentally by a Machete hammer, revealing the relationship between the capacitance change, leakage current change, and acceleration under different working conditions. Secondly, a mechanical model of the ceramic capacitor is established to simulate the change in capacitance value, which shows that the main factor of the capacitance change is the deformation-derived change in the facing area between the electrodes. Lastly, an equivalent circuit model is established to simulate the change in the leakage current, which shows that the main factor of the leakage current change is the piezoelectric resistance of the ceramic dielectric.
Highlights
A penetration weapon is a kind of high-value ammunition used for attacking strategic hard targets, such as weapon depots, missile launching sites, airport runways, and command centers
Prume et al established a finite element simulation model for electrical, mechanical, and thermal coupling of an MLCC [12]; Lee et al used a multi-scale homogenization modeling method to characterize the structural characteristics of multilayer ceramic capacitors [13]; Zhang et al used the equivalent mechanical model to describe the impact-driven deformation of an MLCC and reveals that the electric field distortion resulting from the deformation can cause
Leakage are presented in real time, and the internal mechanism causing the electrical parameter changes is upon subjection to a high impact are presented in real time, and the internal mechanism causing the studied by physical field modeling and equivalent circuit modeling, which provides significant guiding electrical parameter changes is studied by physical field modeling and equivalent circuit modeling, towards the reliable use of guiding an MLCC
Summary
A penetration weapon is a kind of high-value ammunition used for attacking strategic hard targets, such as weapon depots, missile launching sites, airport runways, and command centers. The MLCC damage, but the penetration fuzebut stillthe misfired due to fuze the parameter drift. This focuses on the did not have structural damage, penetration still misfired due to paper the parameter drift. The and changes in MLCC and leakage are presented in real time, and the internal mechanism causing the electrical parameter changes is upon subjection to a high impact are presented in real time, and the internal mechanism causing the studied by physical field modeling and equivalent circuit modeling, which provides significant guiding electrical parameter changes is studied by physical field modeling and equivalent circuit modeling, towards the reliable use of guiding an MLCC in a penetration fuze. Which provides significant towards the reliable use of an MLCC in a penetration fuze
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