Abstract
Abstract The perforation tests of 45 # steel target plate and 2A12 aluminium alloy target plate by PELE (the Penetrator with Lateral Efficiency) were carried out in this paper to study the perforation failure characteristics of metal target plate. The macroscopic morphology of perforation on the target plate and the plug was observed, and the perforation wall was cut and polished to observe the distribution and trend of the cracks in the perforation wall by scanning electron microscopy (SEM) and metallographic microscopy. The magnitude and direction of the force produced by PELE on the target during penetration were calculated by numerical simulation. The experimental and numerical results show that, the perforation failure of metal target plate by PELE is different from the ductile perforation by conical-nosed projectile and the punching failure by flat-nosed projectile. The longitudinal cross section of the perforation is funnel-shaped and the shape of the plug is like a circular truncated cone. In the process of penetrating the target plate, the expansion of the filling causes the jacket to exert a force with a certain angle to the direction of projectile movement, which is the main reason for the funnel-shaped perforation and the circular truncated cone shaped plug.
Highlights
The study of penetration failure of metal structural plates under impact loading has always been an important research topic in the field of impact dynamics (Rodríguez-Martínez et al, 2013; Masri, 2015)
Combined with the plug obtained by simulation, it can be clearly seen that the rear end of the plug has no obvious bulge but significant flanging, which indicates that the compression effect of the projectile on the target plate lasts very short, and the local shear plays a major role in the perforation process
The diameter of the front flanging on the target plate is about 15.50 mm, and the diameter of the rear flanging is about 19.20 mm, which are 1.22 and 1.51 times the diameter of the projectile, respectively. It shows that the projectile has obvious perforation enlargement effect on the target plate
Summary
The study of penetration failure of metal structural plates under impact loading has always been an important research topic in the field of impact dynamics (Rodríguez-Martínez et al, 2013; Masri, 2015). Experiments and numerical calculations on the penetration of flat-nosed, ball-nosed and conical-nosed projectiles with a diameter of 20 mm to the steel plate with a thickness of 12mm were carried out by Børvik and his co-workers (Børvik et al, 2002a, 2002b). They found that for flat-nosed projectiles, the finite plastic deformation of the target plate appears outside the local shear zone, but for cone-nosed projectile, the plastic deformation near the perforation on the target plate is quite larger. Børvik et al (2003) carried out experiments, theoretical and numerical studies on flat-nosed projectiles impacting Weldox 460E steel plates of different thickness at different velocities. Macroscopic and microscopic observation of perforation on the target plate and numerical simulation were carried out to study the perforation failure characteristics of PELE on metal target plate
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