Numerical study on failure pattern of ultra‐high performance cement based composite under oblique penetration

Abstract This study aims to investigate the failure pattern of normal and oblique penetration at the striking velocities from 200 to 1800 m/s for ultra‐high performance cement based composite (UHPCC). The projectile residual velocity and depth of penetration (DOP) of all test series with various striking velocities were quantitatively characterized by LS‐DYNA program. The damage development of UHPCC target and the changes of the ballistic trajectory, as well as the parametric influence, such like striking velocities, compressive strength and incidence angle of projectile, were analyzed and discussed. The results indicate that the damage is primarily concentrated around the ballistic trajectory, and with the increase of compressive strength, the damage area of the UHPCC target gradually decreases, while the damage propagation rate increases. As for oblique penetration, the variations in the incidence angle lead to different internal damage degrees of UHPCC target. Notably, the incidence angle has an amplifying effect on the DOP at , while this amplification effect is not obvious at low‐velocity (<800 m/s). When , the projectile would deflect anticlockwise or even ‘jump’. In addition, an improved Forrestal model considering the amplification effect of incident angle on DOP under oblique penetration is proposed by introducing an amplification factor k .