高瞬态冲击下陶瓷电容损伤过程中的参数漂移特性

During the course of the projectile hitting and penetrating a target, the impact fuze will be subjected by large transients and high overloads, which cause a sharp increase in stress on capacitor and serious structural damage. The drift of capacitance parameter caused by the transient of stress further affects the circuit unit related to the capacitance. For this problem, a high repetition frequency capacitor parameter test method is proposed based on the principle of high-speed charge and discharge. A split Hopkinson bar test device is used as the loading path. A test system for testing capacitance parameter drift during high transient loading was designed, and multiple sets of highly dynamic loading tests were performed, and the peak overload was increased from 18 000 g to 168 000 g. The charging and discharging phenomena of the cracked and uncracked capacitors during the shock loading were observed. The change processes of capacitive strain, shock overload, and electrical parameter were obtained through data analysis. The data curve shows that, when the stress wave first passes through the capacitor, the capacitance value of the capacitor shifts, and the change in capacitance value varies due to strength. This parameter drift phenomenon may cause the voltage of the charged capacitor plate to rise.