Far-field shock wave peak pressure distribution for underwater explosion of cylindrical charges

Based on the dynamic analysis software AUTODYN, numerical simulation was performed for underwater explosion of cylindrical charges. Using the 2D calculation method under infinite water and RDX cylindrical charges, shock wave pressure peaks of different positions in 5 directions along half-lines with interval of 22.5° between axial direction and radial one of a cylindrical charge were obtained, and the effects of action direction and aspect ratio on far-field pressure peak distribution were qualitatively analyzed. Then, to avoid direct quantitatively analyzing shock wave of a cylindrical charges, the assuming that there exists mapping relation between peak pressure distribution of a cylindrical charge explosion and that of spherical one with same dose was made. Then, the mapping coefficient was obtained, and the formulas of far-field shock wave pressure peak distribution for cylindrical charges was developed using the empirical formulas for spherical charges. Finally, the numerical simulation for underwater explosion of TNT charge was conducted, and the proposed assuming and the distribution formulas were preliminarily verified. © 2016, Editorial Office of Journal of Vibration and Shock. All right reserved.