Effects of shell thickness on the fragment velocity distribution of D-shaped casing filled with explosive

Asymmetric casings filled with explosive have attracted increasing attention in the defence technology (e.g. innovative warhead design) and improvised explosive devices (IEDs) protection. As a typical asymmetric casing, D-shaped casing has been used in deformable aimable warhead, deployable aimable warhead as well as warhead in hypersonic weapons. To assist the design of asymmetric warhead, this work examined the velocity distribution of fragments from the bottom part of the D-shaped casing with different shell thickness. The fragment velocity distributions of the D-shaped casings with different shell thickness were numerically analyzed based on the SPH method. Numerical and theoretical analysis showed that there are opportunities to do optimization of shell thickness of D-shaped casings to maximum the utilization of the energy released by explosive. The findings herein could serve as a reference for further investigations on the fragment velocity distribution of D-shaped casings and provide a foundation for asymmetric warhead design.