Experimental determination of fragment dynamics of refractory non-metallic silicate material under high-velocity impact

Abstract

The individual velocity of rupture fragments after impact is necessary to evaluate how dangerous they are after dispersion. The aim of the study is to experimentally determine the velocity of rupture fragments upon impact on a refractory non-metallic silicate material (potassium fluorophlogopite). The targets made from potassium fluorophlogopite were shaped in the form of flat plates with a size of 280x160x15 mm. A steel ball with a diameter of 23 mm was used as a projectile. Four impact experiments were performed with the following parameters: ball speed of 230 m/s and collision angle of 90°; ball speed of 120 m/s and collision angle of 90°; ball speed of 230 m/s and collision angle of 30°; ball speed of 120 m/s and collision angle of 30°. The velocity of the rupture fragments was determined through video recording obtained using a high-speed Photron Fastcam SA5 camera. The video was processed by analyzing frame-by-frame images using the ImageJ-FiJi. The velocities of individual rupture fragments upon impact on a refractory non-metallic silicate material are experimentally determined using the example of potassium fluorophlogopite. It is established that the nature of the change in the fragment velocity relative to time corresponds to a hyperbolic function and depends on the kinetic energy of the fragments. A coefficient for calculating the change in the velocity of rupture fragments of potassium fluorophlogopite relative to time is proposed.