In order to enhance the penetration capability of the shaped charge jet, different liner forms are used. These modifications help to increase the jet tip velocity, as well as to improve the distribution of the kinetic energy. AUTODYN software is used to perform these numerical simulations. Euler solver of the AUTODYN is used to simulate the jet formation and Lagrange solver is used for penetration problem. Numerical results have good agreement with the available experimental results from the literature. For the same charge calibre and main charge length, several liner forms as conical, circle and trumpet are investigated. Results show that the trumpet form has a higher penetration capability than other forms. Distribution of kinetic energy along the liner with variable liner thickness is more suitable to get higher cumulative jet efficiency on the target
This paper presents a numerical study of the effect of main parameters (liner material, explosive charge, stand-off distance and the presence of the wave-shaper), on one hand, on the jet formation, jet velocity and the jet length, and on the other hand, on the penetration depth. We propose a numerical approach to evaluate their effects on the performance of the shaped charge. AUTODYN-2D software is used for numerical simulations of the shaped charge. The multi material Euler solver of the AUTODYN is used for the jet formation investigation, whereas, Lagrange solver is used for the resolution of the penetration problem. Results have shown that the presence of waveshaper increases the shaped charge depth penetration. For the standoff of 6 charge calibres, the jet penetration is found to be deepest. It is found that the jet velocity is proportional to the jet energy, and the penetration is proportional to the liner density. The oblique explosive reactive armor is more efficient for the protection of the main target. Numerical results have a good agreement with the data from available literature-with experimental results for the chosen explosives.
The compositions of granulated plastic bonded explosive (PBX), based on octogen (HMX) and Estane polymer were prepared by aqueous/solvent slurry coating tehnique, on a laboratory and industrial scale. Scale-up was done in an environmentally friendly and cost-effective way: with provided recyclage and reuse of the used organic solvent. The quality of the obtained granulated PBX samples was observed trough the following analyses: the quality of polymer coating layer on HMX crystals was examined by microscopic analysis; the phlegmatizer content in PBX samples was determined; granulometric analysis and the tests of sensitivity to friction and impact were carried out. Compressibility of granulated PBX was determined by pressing. Measured detonation velocities of pressed PBX charges were compared. The obtained properties of the examined pressed PBX indicated that it may find application as a promising main explosive charge in cumulative warheads.
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