柱形装药空中运动爆炸冲击波荷载计算模型OA北大核心CSTPCD

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.