Abstract: A magnetic sensitive penetrating layer counting method is proposed to solve the problem of signal sticking when the penetration fuze is penetrated at high speed. Magnetic steel and magnetic sensors are installed in the penetration fuze. When the warhead penetrates into the finite thick reinforced concrete target, the magnetic field strength in the fuze changes significantly with the change of the relative position of the target and the warhead, and can be used as a response signals of penetrated layers. The response signal of the penetrated layer is detected to count the layers by using the magnetic sensor. According to the proposed method, the penetrating warhead and reinforced concrete models were established by finite element method, and the penetration process was simulated. A magnetic sensitive simulation fuze was designed and fabricated. The reinforced concrete target was simulated by steel mesh, and the static semi-physical test was carried out to verify the feasibility of the magnetic susceptibility layer method. The proposed method has the advantages of being less susceptible to speed and vibration, and can realize the accurate metering when the penetrating warhead with large aspect ratio penetrates the multi-layer concrete target at high speed. Key

Key words: penetrationfuze, magneticsensitivity, penetrationlayercounting, finiteelement