Research On The Application Of Carbonyl Iron Composite Absorbing Material In The Anti-electromagnetic Interference Of Fuz

With the improvement of electronization and intellectualization of weapons,fuze,as a key subsystem of ammunition precision attack and efficient damage,integrates a large number of electronic components,which makes it have great hidden problem under electromagnetic interference and affect the display of combat effectiveness.In view of the high degree of electronization of modern weapons such as fuzes,military powers have successively developed and equipped various powerful electromagnetic interference weapons such as high power microwave.Therefore,the fuze faces the severe challenge of electromagnetic interference in modern war.In this paper,a method of installing absorbing material in the fuze cavity is proposed to consume the electromagnetic energy coupled into the fuze,so as to improve the anti-electromagnetic damage performance of the fuze.The research contents of this paper include:1)Multiwalled carbon nanotubes/carbonyl iron powder/polyurethane foam composite absorbing materials were prepared and their absorbing properties were studied.The influence of installation position of absorbing material on the electromagnetic protection effect of fuze was studied by electromagnetic simulation software,and the interference suppression performance of absorbing material under different strong electromagnetic interference was analyzed.In the three interference sources of high power microwave,ultra-wideband pulse and high altitude nuclear electromagnetic pulse,the high power microwave with high frequency energy has the most obvious effect on the fuze,and the absorbing material can effectively reduce the coupling effect of the three interference sources to the fuze,among which the high power microwave interference has the most significant suppression performance.2)In order to solve the problem of highly overload resistance of the absorbing material,the dynamic mechanical properties of the composite foam absorbing material were measured by using a split Hopkinson pressure bar device,and the stress-strain curve of the material was obtained under the condition of high strain rate.When the composite foam absorbing material is subjected to compression shock load,it can absorb a lot of energy under low stress level by elastic deformation,thus showing good compression resistance.The force condition of absorbing material under high overload condition is studied by numerical simulation.3)Strong electromagnetic field irradiation experiment was carried out on the simulating fuze before and after attaching absorbing materials.The experimental results show that: In strong electromagnetic field,the fuze detonating control circuit of the microprocessor or conduction control device will be interfered,semiconductor devices can be temporary failure happens or slight damaged.After attaching the absorbing material,the interference phenomena disappear.The absorbing material is verified in strong electromagnetic interference shielding effectiveness of protective design.