Research About The Relation Between A Shaped Charge Penetration And Compression Strength Of A Concrete Target

This study has provided a set of dynamic response physics equations of a concrete, which endure a strong short time impact .The equations consist of a elastic-plastic constitutive equation in increment form, describing shape deformation; Johnson-Cook model, describing hardening rule and accumulate damage; and a high pressure solid equation of state ,describing cubic deformation. In this paper we have verified the validity and the practicability of the analytical model, and analyzed all of factors in the equations which influence the penetration of the concrete target, showing that the penetration is correlated to the acoustic impedance and initial porosity under high pressure in the steady penetrating phrase, and in the penetrating stagnation phrase the penetration is correlated to the equivalent stress intensity of the concrete.In this paper a two-dimensional Eular numerical simulation approach and program have been developed. Using this program, we have taken numerical analog computation of the YD89-3, YD102 and YD127 penetrating the concrete target, which are made in daqing perforating charge plant, and provide detailed result. On the basis of analyzing the computing result, test data and the charge-target fundamental structure, taking further numerical computation, data fitting and development, we get an empirical formula of the concrete penetration which are as functions as the concrete compression strength, the explosive mass of the charge ,standoff and other factors. This formula has been shown to be valid for a broad range of shaped charge designs in concrete targets. Comparing to the experiments of the YD89,YD102,YD127, the result is exciting.