| Aimed at the aftereffect problem from an EFP penetrating the finite thickness target plate vertically,researched the characteristics of the behind armor debris field,which used the means of dimensional analysis,simulation and experimental research.It lays the foundation for the subsequent work of evaluating the damage effectiveness on EFP warheads attacking armored targets.Starting from the shape description of behind armor debris cloud,based on the theory of dimension analysis and orthogonal design,a mathematical model for describing the shape of behind armor debris cloud from an EFP penetrating the finite thickness target vertically was established.The model can effectively reflect EFP forming parameters and material parameters of penetrator and target(EFP solid length l,EFP solid diameter d,EFP velocity v,EFP densityρ_p,target thickness t).Based on the SPH algorithm in AUTODYN-3D,studied the shape change of behind armor debris cloud from an EFP penetrating the finite thickness target vertically along the penetrator and target parameters.The influencing laws of penetrator and target parameters for the debris cloud shape were revealed,the simulation results and test results proved the correctness of the calculation model.Starting from the distribution law of behind armor debris,the influences of EFP velocity and target thickness on the distribution characteristics of behind armor debris were studied by simulation method,obtained the number,size,mass,velocity and energy distribution laws of EFP fragments and target fragments in the behind armor debris.Meanwhile,the distribution test of the behind armor debris from an EFP penetrating the finite thickness target plate vertically was designed.The test results showed that aftereffect fragments distribute evenly in the quadrant area around the debris cloud,and the fragments energy centrally distribute in the range of 0~30 degrees’section,and the damage area of the behind armor debris to the multi-layer aluminum target is initially trumpet shaped and then elliptical.Moreover,the influence of target thickness on behind armor debris characteristics is in good agreement with the simulation law. |
