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| DAMAGE AND PERFORMANCE OF THE BRIDGEWIRE ELECTRIC DETONATOR UNDER HIGH SHOCK OVERLOAD |
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Abstract The influences of peak acceleration, loading direction, and product structure on the damage and performance of two standard bridgewire electric detonators, one leg and two legs structure, were studied by gas gun at high overload of 60 000g, 80 000g, 100 000g and 120 000g. The damage laws and damage modes were obtained, which were further analyzed by dynamics theory in conjunction with the product structures. The results show that there are three types of damage modes, namely, local plastic deformation, relative displacement, and brittle damage, which are indicated by impact end deformation, electrode plug moving inward, electrode and fuses incline, electrode plug crack, resistance increase, bridgewire break, and increase of output power scattering. The total length change rate increases with the acceleration raising under output loading mode, and the total length decrease for one leg detonator is caused by electrode plug moving inward, while the total length decrease for two legs detonator results from impact deformation. The resistance of one leg detonator changes obviously under lateral loading mode, with the bridgewire break and detonator explosion occurring occasionally. The output power scattering increases after high-g loading.
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Received: 28 June 2013
Published: 28 June 2014
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2014, Vol. 35 
