为预测战斗部的爆炸威力,对柱形装药运动爆炸的入射和反射冲击波峰值超压和最大冲量开展数值仿真研究.首先,基于AUTODYN有限元分析程序提出了"三阶段"装药运动爆炸有限元分析方法,通过与已有静止和运动爆炸试验结果对比,验证了方法的可靠性.然后,考虑装药运动速度、长径比、比例距离、方位角和刚性反射等影响因素,开展了运动爆炸工况下200组柱形装药的数值模拟.结果表明:相较于静爆,动爆冲击波场整体前移,波阵面强度在装药运动方向增强而在反方向减弱,该影响与装药运动速度正相关.最后,针对柱形装药空中自由场运动爆炸和垂直于目标迎爆面运动爆炸的典型工况,分别提出了装药运动爆炸入射和反射冲击波峰值超压以及最大冲量的计算模型.该模型与2种战斗部柱形TNT装药运动爆炸工况的数值模拟结果符合良好,能较好地计算柱形装药空中运动爆炸冲击波荷载.
Ammunition warheads are typically cylindrical charges that detonate at the moving stage. To accurately calculate the blast wave power field and the blast loadings acting on the structure of an air-moving cylindrical charge explosion,the peak overpressure and maximal impulse of the incident and reflected blast waves in the air-moving cylindrical charge explosion were numerically simulated. Firstly,a three-stage finite element analysis method for the explosion of air-moving cylindrical charges was proposed based on the AUTODYN finite element analysis program,and the reliability of the method was verified by comparing the simulated and test data of existing charges air static and moving explosion tests. Then,numerical simulations were conducted for 200 sets of scenarios of air-moving cylindrical charge explosions,considering factors such as charge-moving velocity,length-to-diameter ratio,scaled distance,azimuth angle,and rigid reflection. The distribution characteristics of the moving explosion blast wave field,and incident and reflected blast wave loadings were quantitatively analyzed. The results indicate that the blast wave field of a moving explosion is moved forward compared to the static explosion,and the wavefront strength is enhanced in the direction of charge movement and weakened in the opposite direction. This effect is positively correlated with the charge moving velocity,while the influence of changing the length-to-diameter ratio is small on the blast wave field. Furthermore,for the typical scenarios of air-moving cylindrical charge explosions in a free field and in a reflected field where the cylindrical charge was perpendicular to the target surface,calculation models for the peak overpressure and maximal impulse of the incident and reflected blast waves of the explosion of air-moving cylindrical charges were proposed. Finally,through carrying out numerical simulations of 40 sets of scenarios for the explosion of two simplified moving cylindrical TNT charges of prototype warheads,and comparing data of calculation models and simulations,the applicability of the proposed calculation model was validated. The results indicate that the calculation model is good at evaluating the blast wave loading of air-moving cylindrical charge explosion,which can also provide a certain reference for predicting the moving explosive power of warheads.
王明涛;程月华;吴昊
同济大学土木工程学院,上海 200092
力学
柱形装药;空中运动爆炸;峰值超压;最大冲量;计算模型
cylindrical charge;air moving explosion;peak overpressure;maximal impulse;calculation model
《爆炸与冲击》 2024 (007)
105-123 / 19
国家自然科学基金(52308522);国家资助博士后研究人员计划(GZB20230527);中国博士后科学基金(023M742663)
10.11883/bzycj-2023-0447
评论