Based on the gridless SPH numerical technique of Ls-dyna hydrocode,the characteristics of debris clouds originating from impact of spherical projectile on the plate at different velocities were simulated.

The variations of the diameter of holes,the debris clouds width,the cumulative percentage of fragments,the dimensionlcss momentum,the residual velocity and the velocity vectors of debris clouds are discussed.

The numerical simulation of the penetration and debris clouds is performed that columnar bar of high velocity impacts on thin steel plates with this method,and the problem is solved that how to found the SPH element model of the columnar bar,and the mechanism of forming process is analysed.

Characteristics of debris cloud produced by normal impact of spherical projectile on thin plate shield;

Laser shadowgraph for the visualization of hypervelocity impact debris cloud;

The rules of debris cloud produced by AL sphere normal impacting into AL thin target plate were analyzed and some relationships between penetration holes,radiation angle and,debris cloud characteristics and impact velocity,t/d were presented.

The paper introduces the technological processes, technical conditions, waste water treatment and applications of non-calcined mica paper with scrap mica as raw materials.