高过载条件下电雷管桥丝损伤的模型分析

Damage Model for Bridge Wire of Electric Detonator Under High-g Loading

基于解析几何学的基本原理,建立双脚线电雷管的桥丝在横向过载时受拉损伤的计算模型,获得桥丝拉伸率、临界初始角度和电阻值的变化规律。结果表明:桥丝拉伸率、临界初始角度及电阻变化率均随电极塞横截面椭圆度的增加而增加;当桥丝的初始角度小于45°,桥丝未受拉伸作用,电雷管的最佳放置方式是桥丝平行于电雷管的运动方向。这与ANSYS/LS-DYNA数值仿真结果十分吻合,所建立的模型可以较准确地描述横向过载时桥丝的损伤特性。

Based on the basic principle of analytic geometry, a model was built to describe the tensile damage process of bridge wire of double-wires electric detonator under lateral high-g loading. The tensile ratio, critical initial angle and resistance value of the bridge wire were obtained. Results show that the tensile ratio, critical initial angle and resistance value increase gradually with the ovality of the electrode plug increasing. The bridge wire is not stretched when the initial angle is less than 45°, and the best way to put the detonator is to keep the bridge wires parallel with the impacting orientation. The model results agree well with the ANSYS/LS-DYNA simulation results, and the model can accurately describe the damage characteristic of the bridge wire under lateral high-g loading.