Effect of eccentric edge initiation on the fragment velocity distribution of a cylindrical casing filled with charge

Cylindrical casing filled with charge under eccentric point initiation at one end is commonly used in warheads and can occur in some explosion accidents. The fragment velocity distribution of the casing is an important parameter in warhead design, structure protection and safety. A formula composed of three terms, including the influence formula of eccentric initiation, rarefaction wave and incident angle of the detonation wave was proposed in the present work to determine the fragment velocity distributions of a cylindrical casing under eccentric point initiation at one end. The influence of the incident angle of detonation wave is proposed as the key factor. A numerical simulation model was proposed, validated and used to determine the influence of the incident angle of detonation wave. Its corresponding formula g (α_c) was established and validated with the established numerical simulation model. The rest of two factors can be calculated with previously reported formulas. The formula proposed in the present work was further validated with the established numerical model. The results indicate that the calculation formula can accurately predict the fragment velocity distributions along the axis and circumference of a cylindrical casing under eccentric point initiation at one end.