1.School of Mechanical and Electrical Engineering, North University of China, Taiyuan 030051, China;
2.National Defense Key Discipline Laboratory of Underground Target Damage Technology, North University of China, Taiyuan 030051, China;
3.Shandong North Coastal Machinery, Zibo 255000, China
Abstract：In order to provide effective reference data for the design of warhead damage element, it is useful to carry out researches on the effects of the mass of typical column fragment and the target attitude on the ballistic limit velocity (V50) of armor steel. In the condition of a 5g-mass tungsten column with aspect ratio of 1 at 0° and 90° target attitude through ballistic impact test, the V50 of 10mm armor steel was achieved: the V50 of tungsten column fragments penetrating 10mm armor steel in longitudinal direction is 745m/s, and the V50 of tungsten column fragments penetrating 10mm armor steel in transverse direction is 761m/s. In the process of penetration, the tungsten column fragments were upset transversely, and the heads of the fragments were extruded and abrased by the target plate so that the fragment formed a mushroom head-shaped flap. Because of the limitations of the single experimental data, the V50 of three typical tungsten columns (3g, 5g and 8g) penetrating 10mm armor steel in different target attitudes were achieved by using the numerical simulation. And the influence of target attitudes and fragment quality on V50 were also explored. The relative error between the numerical simulation and test results was about 10% through making a comparison. It founds that the V50 of tungsten column penetrating armor steel has fluctuation range under different target attitudes. V50 is the minimum when the fragment is vertically facing the target, and the maximum V50 is the maximum when the fragment is at the target attitudes angle of 40° ~ 60°. The V50 of tungsten column penetrating armor steel is positively correlated with the windward area of the fragment. When 3g tungsten column penetrating armor steel, the maximum of V50 increases by 4.98%, 5g fragment increases by 3.51%, and 8g fragment increases by 2.62% compared with the minimum of V50. The heavier the tungsten column fragment, the less obvious influence of different target attitudes on the V50 of tungsten column fragment penetrating armor steel. At the same time, the fluctuation range of V50 is smaller.
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