Effect of wave shaper on optimum standoff of copper liner shaped charge against steel target

A wave shaper is embedded in charge can increase the jet tip velocity and the penetration performance, but thus affects the optimum standoff of copper jet. To investigate the influence of wave shaper on optimum standoff, numerical simulations based on LS-DYNA code with the three-dimensional axisymmetric model are conducted, including the propagation behavior of detonation wave, the jet velocity and its characteristics, and penetration depth of copper jet, and the experimental verifications are used. The simulations show that the spherical detonation is converted into the conical detonation wave by using the wave shaper, decreasing the incident angle of the detonation wave at the top of the liner, which will increase the jet tip velocity and jet length but decrease the jet tip diameter. The penetration depths and hole-diameters of experimental are well agreement with the simulations. Under the same standoffs, the penetration depths of copper liner shaper charge with wave shaper are higher than that without wave shaper, whereas the hole diameters with wave shaper are lower than that without wave shaper. When the cone angle of copper liner is 60°, the optimum standoff of copper jet with wave shaper is about 1.5 CD-2.5CD, and the without wave shaper is about 2.5 CD-3.5CD.