弹头上膛线磨痕表面的分形模型

在发射子弹过程中,枪管膛线和弹头构成了枪械中最重要的摩擦副之一·理论分析和实验结果表明:随着枪支发射子弹量的增加,枪管膛线表面粗糙度增大,它对弹头表面磨损加剧,故弹头上膛线磨痕表面的分形维数D也将随着枪支发射子弹量而发生变化·根据实测数据得出分形维数D的动态方程,基于摩擦学原理和分形理论,提出了弹头上膛线磨痕表面的动态预测分形模型,其动态预测趋势与实验数据吻合·本文探索的目的在于通过分析弹头上膛线磨痕表面的变化特征来推断枪支的磨损程度·

A Fractal Model of Rifle-Worn Surface of Bullets

The basic relationship between fractal dimension "D" and the amount of shot bullets was found by collecting the data from actual measurements and analyzing the topography of bullet surfaces worn out by rifle of a gun. A dynamic equation of fractal dimension D was therefore proposed and, based on it, a fractal model for dynamic prediction of surface wear-out condition was given to establish the direct relationship between wear rate and amount of bullets shot. The fractal dimension or wear rate may be used as a characteristic parameter to examine the topography of worn-out by rifle. The dynamic prediction shows its conformity to experiment data and its available to judge the extent of wear-out of a gun through an analysis of the properties of its rifle worn out in turn by the surface of bullet. Therefore, the model is helpful to provide theoretically not only a basis to judge gun failures but a reference to infer the maintenance and applications of a gun for investigating the cases involving guns.