Velocity distribution of preformed fragments from concave quadrangular charge structures

Compared with traditional axisymmetric charge structure, a novel quadrangular charge structure with preformed fragments on concave surfaces was studied. A static explosion experiment was performed on the quadrangular charge structure with preformed fragments, and the velocity distribution and dispersion of fragments were determined by using pulse X-ray photography. Numerical calculation model of quadrangular charge structure was verified by comparing it with the experimental result. Both experimental and numerical research demonstrated that a quadrangular charge structure with concave radians had a significant focusing effect on the energy distribution of the preformed fragments. Additionally, the fragment velocity distributions and dispersion characteristics of the charge structures with different concave radians were studied numerically. An empirical formula for the velocity of fragment from charge structures with different radians was preliminarily obtained. The results of this study lay a foundation for further research on prismatic charge structures with concave surfaces and provide a reference for developing better protection from the damage.