慢速烤燃环境下引信热响应特性测试与仿真

A research method for the thermal response of detonating fuze in cook-off environment is proposed to reveal the thermal response characteristics of fuze for insensitive munition, and heat transfer path and law. The cook-off test and thermal finite element simulation are made for a radio fuze of projectile for 76 mm naval gun. In the cook-off test, the heating rate of 1.17℃/min and the ultimate temperature of 270℃ are given as thermal stimulus conditions in cook-off test, and a "module replacement" method based on the thermal impedance equivalence principle, i.e., replacing the "battery component" with "thermocouple measuring system", is used. The original heat transfer path of fuze is not affected by adding an embedded temperature measuring system. Such embedded temperature measuring system with Teflon shell is capable of recording temperature data, and has the advantages of high reliability and multi-channel synchronous sensing. In addition, the heat transfer path, i.e., pressed screw-safe and arming device-lead explosive-booster explosive, of fuze in cook-off is confirmed by comparing the temperature differences among five components in the fuze. The increases in the thermal impedances of the pressed screw and the safe and arming device can greatly reduce the accidental ignition probabilities of lead explosive and booster explosive.