| Popis: |
To study the correlation between the bullets deformation characteristics and incident parameters of a 7.62mm lead pistol bullet during impacting to concrete, and to find the sensitivity relationship between each characteristic eigenvalue and quantity parameters, the finite element model of a 7.62mm lead pistol bullet hitting the concrete target was established. The accuracy and effectiveness of the numerical simulation were verified by experiments, and the numerical method can truly reproduce the motion behavior of the bullets in the process of hitting concrete. The results showed that under normal penetration, the angle between the impact surface and the projectile axis can be judged as a normal penetration, the height of the bullet decreases with the increase of incident velocity and is more sensitive to incident velocity, and the deformation of the bullet showed more characteristics under oblique penetration, and the changing trend of each eigenvalue at a different incident angle is similar. In addition, the grey correlation analysis of each eigenvalue of bullets deformation was carried out, and the sensitivity relationship of each eigenvalue to incident parameters was obtained, which provides technical support for the ballistic reconstruction of gun-related cases. |
