钨铜变密度聚能射流侵彻模型及应用

Tungsten-copper (W-Cu) is a friction-bonded two-phase composite material with relative low interface bonding forces. A density deficit caused by phase separation and transient vacancy is often observed in W-Cu jet. Traditional penetration models are mainly based on the constant-density assumption neglecting the microstructural changes in shaped charge jet, which may trigger a considerable calculation error in the penetration prediction of W-Cu jet with non-cosntant density. A modified virtual origin penetration model for W-Cu jet is proposed by introducing the density and speed functions of jet, in which both material compressibility and composition gradient are considered. Based on a typical shaped charge structure, the true density distribution of 75wt%W-Cu jet was obtained, and the calculated penetration depth was validated by the experiment. The results show that the W-Cu penetration model can greatly improve the calculation accuracy compared with the traditional virtual origin model and partially modified model.