| The response of a fuze to sympathetic detonation is studied based on insensitive munition technology to improve the safety of the fuze under sympathetic detonation through structural improvement,including change of fuze package and change to desensitive munition.At the same time,the methods to initiate desensitive munition charge are studied.In order to analyze the response of the charge within fuze under sympathetic detonation,LS-DYNA is used for numerical simulation,and the law of response is obtained.It is shown that the numerical simulation agrees reasonably well with reference test,which proves that the numerical model is credible.The package of fuze will obviously delay the time when the fuze is subjected to the action of shock wave and detonation product,and reduce the pressure on the fuze charge.Thus the probability of sympathetic detonation of acceptor is reduced.When the charge density of the donor is higher and the charge density of the acceptor remains unchanged,the pressure on the surface of acceptor charge is larger,and the acceptor is more easily detonated.When the charge density of the donor remains unchanged and the charge density of the acceptor is higher,the critical initiation pressure of the acceptor charge is higher,and the acceptor charge is hard detonated.The position of initiation point of the donor has great influence on sympathetic detonation.When initiation point is in the middle of the donor charge and is located away from the side of the acceptor,the acceptor gets greater pressure.In order to study the influence of structure and material of the fuze package on acceptor sympathetic detonation,LS-DYNA is used to simulate the sympathetic detonation,and the influence of improved fuze structure on its safety is obtained.According to simulation results,the wave impedance of the material of single-layer packing box is greater,the "isolation" performance is stronger,and the anti-sympathetic detonation capability of acceptor is better;for double-layer packing box with the same thickness,the combination of "energy absorption-layer" after "energy isolation-layer " is better than that of "energy absorption-layer" after the "energy absorption-layer " in the anti-sympathetic detonation performance;For triple-layer layer packing box with the same thickness,the combination of energy absorptionenergy isolation-energy absorption outperforms the combination of energy isolation-energy absorption-energy isolation in anti-sympathetic detonation capability.for the same thickness,poplar-foamed aluminum–poplar combination has better performance to resist sympathetic detonation.The greater the thickness of the filler in the fuze package,the better the energy absorption effect of filler and the stronger the anti-sympathetic detonation ability of the fuzepackage.Among the materials used for filler,polytetrafluoroethylene,polystyrene,polyethylene and phenolic resin,polytetrafluoroethylene is the best material as the anti-sympathetic detonation filler.In order to overcome the difficulty to initiate desensitive warhead in ammunition,LS-DYNA is used to optimize the structure and material of booster charge.The effect of optimized booster charge structure on its initiation ability is obtained.According to simulation results,the booster charge with conical,spherical and ellipsoidal bottom structures can enhance its initiation ability under certain conditions,and the booster charge with conical bottom structure has greater output power.Within a certain extent,the greater the conical angle of the booster structure,the smaller the proportion of transition section,and the greater the radius of the transition section,the stronger the output power of the conical booster.For conical booster,the higher the density of the side wall material and the bottom material of booster,the stronger the output power of booster.When the material of the side wall and bottom of the conical booster is T2 copper,the stress on the central point unit of the upper surface of the principal charge is the greatest. |
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