Influence of the donor charge initiation on the fragments cloud of a metal plate pushed by high explosives

Spalling and possible metal phase change are observed when the free surface of a metal plate reflects a release wave generated by HE. The influence of the shock wave profile, the sweeping propagation and the shock wave collision are investigated using different initiation and booster set-ups on a small scale screening plate push test. These phenomena have been explored with different thicknesses of several metals (Al, Cu, Sn) and different HE diameters and thicknesses using three soft X ray flashes by shot, and using a X-ray tomography on foam in which fragments are recovered. The fragments velocities, the apparent densities and the particle size distributions of the recovered fragments are analyzed and correlated