Study on fragmentation scattering characteristics of elliptical variable section intrusive warhead

DOI:	10.11809/bqzbgcxb2025.03.018
Keywords:	elliptical variable cross section warhead; fragment distribution; fragment velocity; LS DYNA
Abstract:	In order to study the distribution of fragments and the velocity of fragments of elliptical variable section warheads under detonation drive, the scattering characteristics of fragments of multiple elliptical variable section warheads were tested. Through LS DYNA software, the SPH (Smoothed Particle Hydrodynamics) method was used to numerically simulate the expansion, rupture and scattering process of the warhead shell, and the radial and axial fragmentation scattering laws of the elliptical variable section warhead under the detonation mode at the bottom center point were studied. The research results show that the fragment scattering pattern of the elliptical variable cross section warhead in the radial direction is that the fragment velocity and fragment distribution density in the short axis direction are both greater than those in the long axis direction, and both increase with the increase of the radial azimuth angle. This phenomenon becomes more obvious as the ratio of the long and short axes increases. For an elliptical variable cross section warhead with a bottom cross section ratio of long and short axes of 1.4, the short axis long axis fragmentation speed difference reaches 18.7%, and the number of fragments in the short axis direction is approximately 4.55 times that of the long axis direction. In the axial direction, due to the changing cross section filling ratio and the ratio of the long and short axes, the axial fragment velocity distribution at different radial azimuth angles is different. As the radial direction angle increases, the maximum axial velocity fragment position is determined by the bottom of the shell. Nearby gradually approaches the middle of the shell.
Issue:	Vol. 46 No. 3 (2025)
Published:	2025-03-31
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