高过载下桥丝式电雷管损伤和性能变化规律研究  

DAMAGE AND PERFORMANCE OF THE BRIDGEWIRE ELECTRIC DETONATOR UNDER HIGH SHOCK OVERLOAD

作　　者：孙晓霞[1,2] 刘卫[1] 沈瑞琪[1] 叶迎华[1] 李创新[1] 胡博[1] 

机构地区：[1]南京理工大学化工学院,南京210094 [2]辽宁北方华丰特种化工有限公司,抚顺113003

出　　处：《固体力学学报》2014年第2期173-181,共9页Chinese Journal of Solid Mechanics

摘　　要：采用空气炮在6万g、8万g、10万g和12万g高过载环境下对制式桥丝式独角和双脚线电雷管进行实验,讨论了加速度峰值、加载方向和产品结构对损伤和性能的影响,获得了高过载下的损伤规律和损伤模式,结合产品结构用动力学理论进行了分析.研究表明:损伤模式有局部塑性变形、相对位移和结构脆性破坏,表现为撞击端变形、电极塞内陷、电极和脚线倾斜、电极塞裂纹、电阻增大、桥丝断裂、输出威力散布增大.输出端加载时长度变化率随加速度增加而增大,独角雷管长度减小由电极塞内陷引起,双脚线雷管长度减小由撞击端变形导致;独角雷管横向加载时电阻变化显著,发生断桥和爆炸;过载后输出威力散布增大.The influences of peak acceleration,loading direction and product structure on the damage and performance of two standard bridgewire electric detonators, namely,one leg and two legs structure, were studied by gas gun at high overload of 60 000g,80 000g,100000g 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 de- formation, relative displacement, and brittle damage. A careful observation indicates that a series of proces- ses take place on damage and fracture surface,including impact end deformation, electrode plug moving in- ward,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 increasing under out- put loading mode,and the total length decrease for one leg detonator is caused by electrode plug moving in- ward, 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.

关 键 词：高过载 损伤 桥丝式电雷管 空气炮 

分 类 号：O347[理学—固体力学]