Partition between useful jet and liner material

Explicit finite software LS-DYNA and tracer point method are used to study the nice partition between useful jet and liner material. The useful jet is divided into four sections in terms of velocity distribution, such as high speed(v_j≥5 km/s), sub-high speed(4 km/s≤v_j<5 km/s), medium speed(3 km/s≤v_j<4 km/s) and low speed(2 km/s≤v_j<3 km/s). The result indicates that the useful region of liner is a thin-wall cone with variable thickness along axial direction. The highest speed section of useful jet is nearby the top of liner, and its thickness is 0.12 thickness of liner. The lowest speed section is in the lower part of liner, and its thickness is 0.46 thickness of liner. The material in rang of about 0.2 height from the bottom of liner can not generate useful jet. Liner material is stripped progressively from the inner side of liner in the process of jet forming. The thickness and mass ratios of useful region to liner are of exponential distribution along axial direction of liner. It can offer a reference the design of efficient shaped charge and composite liner.