Penetration research of jacketed jet into concrete

The current study designs a shaped charge structure that could form a jacketed jet to enhance the cavity diameter created by a shaped charge jet into concrete. Moreover, three types of penetration modes during the process of jacketed jet penetration into concrete, including homogeneous jet penetration, “bi-erosion”, and “co-erosion” are discussed. A two-step mechanism of cavity growth that contains the trajectory of flowing jet erosion products and the radial momentum of the target is used to describe the penetration modes. Thus, an analytical model for predicting the crater size generated by jet is presented. Moreover, the jacketed and single material jets parameters which are needed in the analytical model are obtained using AUTODYN-2D finite-difference Eulerian code. Experimental results show that the jacketed jet creates a larger exit crater than the single material jet. Moreover, the entrance cavity diameter did not change. The calculated hole profile using the analytical method was in good agreement with experimental data.

► We design a shaped charge structure containing a double-layered liner which can form a jacketed jet.
► The jacketed jet penetration modes of homogeneous jet penetration, “bi-erosion”, and “co-erosion” are discussed.
► The cavity diameter created by the jacketed jet is larger than that created by the single material jet.
► A method for predicting the cavity diameter created by jacketed and single material jets is presented.
► The calculated hole profile matches experimental data of jacketed and single material jets quite well.