Numerical simulation research on warhead fragmentation shape and fragments scattering characteristics

DOI:	10.11809/bqzbgcxb2024.05.011
Keywords:	warhead; numerical simulation; FEM; SPH
Abstract:	For warhead damage effectiveness evaluation needs, FEM (finite element method) and SPH (smoothed particle hydrodynamics) were used to build the numerical model of warhead based on the same structure dimensions and material parameters, and the warhead fragmentation shape and fragments scattering velocity distribution along the casing axis were studied. The transmission and distribution of explosive energy in each material were calculated. The results show that the SPH method can better simulate the crack propagation and fragments generation of the warhead. However, in the calculation of the initial velocity of fragments, the SPH method ignores detonation product loading process, while the FEM method cannot calculate the effect of fragmentation velocity involvement. Compared with the experimental results, the FEM method and the SPH method are 4.4% and 7.5% lower, respectively. SPH method can more accurately reflect the transmission and distribution rules of explosive energy in each material. The kinetic energy of fragments accounts for 36% of the total explosion energy, and the plastic deformation energy of shell stretching and breaking accounts for 5.7% of the total explosion energy.
Published:	2024-05-31
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