平板玻璃上弹孔形态与射击方向的相关性检验

Correlation Study on the Direction of Fire and the Shape of Bullet Hole in Flat Glass

对平板玻璃上弹孔形态与射击方向的相关性进行实验研究。确定了弹孔的放射裂纹特征、射入口轮廓特征、射出口层裂特征和弹孔长短轴特征是快速判断射击方向的主要特征。在减少影响因素的基础上,选取了弹孔长短轴比值作为曲线拟合数据,对射击角度与弹孔形态的关系进一步分析。研究结果表明,确保弹孔的形态完整,是精确分析射击角度的必要条件。弹孔的射入口与射出口的长短轴比值均可用于射击角度分析,射入口尺寸数据的价值更高。

The correlation between the direction of fire and the shape of bullet hole in flat glass is studied in experiment. The radial crack, the shape of entry portal, the layered spallation area of exit portal and the ratio between the major axis and minor axis of bullet hole are the most important characters to estimate the direction of fi re in spot judgment. Base on the decrease of infl uencing factors, the major axis and minor axis of bullet hole are used as the data of curve fi tting to analyze the relationship between the angle of fi re and the shape of bullet hole. The result shows that the prerequisite to analyze the angle of fi re accurately is the good condition of bullet hole. It is feasible to analyze the angle of fi re by the ratio of major axis and minor axis of bullet hole. Especially, the shape of entry portal is more valuable than the exit portal.