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 demon-strated 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 char-acteristics of the charge structures with different concave radians were studied numerically. An empirical for -mula 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.