两种手枪弹正侵彻混凝土的变形量及其规律

The bullet deformation can truly reflect the speed and angle of bullet penetrating into the concrete, which are often used as an important basis for the reconstruction of trajectory and the judgment of shooting position in the process of case detection. Two types of pistol bullets penetrating into concrete at different speeds were test and simulated. The results show that the bullet diameter increases with the increase in impact velocity, and the bullet length decreases with the impact velocity. The relation model of bullet deformation characteristics and penetration velocity is established. The function Y is established to analyze the deformation characteristics of bullet. The relationship between Y value and impact velocity can be regarded as a piecewide linear function. The piecewise speed is consistent with the critical speed of armor cracking and breaking. The critical speed of armor cracking and breaking is about 130 m/s for 9 mm bullet and 230 m/s for 51 type 7.62 mm bullet. Function Y can well reflect the deformation law of bullet penetrating into concrete at different speeds.