An Optimization Design of Ring Cutter for Tandem Warhead of Anti-ship Missiles Li Yongsheng a, Wang Weili a, Jiang Tao b (Department of Naval Aeronautical Engineering, a. Department of Weapon Science and Technology; b. Graduate Management Brigade, Yantai, Shandong 264001) Under the charging condition, the cutting effect of the target plate was simulated and analyzed by the annular cutters with different opening angles and different charging shapes. The simulation step verifies the accuracy of the numerical simulation. This conclusion contributes to the optimal design of the new ring cutter.
When the anti-ship missile warhead penetrated the ship's side and superstructure, due to the influence of flight attitude (such as angle of attack, ballistic inclination, etc.), the target posture of the warhead was not satisfactory, and the side wall of the warhead was affected. The premature explosion phenomenon of the charge causes the later damage effect. For multi-layer targets, especially when the first slab is thick, the warhead consumes a lot of energy during the penetration process, and the target attitude is poor, which seriously affects the late blasting effect.
Therefore, it is conceivable to add a circular cutting device capable of forming a jet at the front end of the anti-ship missile warhead to form a tandem warhead. When the warhead touches the target, the annular cutter at the front end acts to form a circular jet to cut the steel plate, so as to facilitate the subsequent intrusion of the warhead.
According to the above requirements, combined with the feasibility of the actual processing, the opening angle 2a of the shape cutter of the annular cutter is taken as two groups of 60 and 90, and then the selection is optimal.
The program is designed to properly design the shape of the ring cutter to meet the best damage.
1 Ring cutter The preliminary design of the anti-ship missile tandem warhead is designed as shown in the figure: the front end adopts the designed ring cutter and the rear end is the semi-armored warhead of the conventional anti-ship missile. Among them, the design of the ring cutter should meet: cutter opening diameter <400mm; drug cover opening diameter <80mm; cutter height <210mm; cutting depth 250mm (0 cutting 921 steel); 30°, 60 angle cutting The effect is as much as possible. 1.2 Charge shape According to the design requirements of the ring cutter, under the condition that the cutter quality is as equal as possible, the three charge shapes are preliminarily designed. As shown, the optimal charge shape is selected through simulation. .
M-combined 'cone f-tablet ring cutter charging shape scheme 2 ring cutter to target plate effect model annular cutter as described above, the high-explosion height is 80mm, in order to fully evaluate the penetration effect of the annular jet, the target plate The thickness is taken as 100mm for the explosive material using the HighExplosiveBum model and the WL equation of state; the hood material is ohnson-cook material model and the Gruneisen equation of state; the target plate is Elastic-Plastic-Hydro material model and Gruneisen equation of state; the shell is Steinberg Material model and Gruneisen equation of state; air uses Null material model and Linear-Polynomial equation of state. The main parameters are shown in Tables 1 and 2.
Table 1 Metal material parameter name Material density / (g / cm. 3) Yield strength / MPa Young's modulus / GPa type cover copper shell homogeneous armor steel Table 2 Charge parameter name material explosion pressure / GPa charge In order to avoid calculation in the complex deformed grid, the explosives, the hood, the shell and the air grid adopt the ALE algorithm, and the target uses the Lagrange algorithm, and the fluid-solid coupling method is adopted between the two. All unit types in the calculation use the 8-node solid element solid164. The finite element model used in the calculation.
The cutter crosses the axis and begins to propagate. When it reaches the surface of the pattern cover, the cover metal moves rapidly from the periphery to the axis of symmetry due to strong compression. The micro element moves to the axis and hits the axis at a higher speed. The inner surface of the cover extrudes part of the metal jet and moves downward in the axial direction at a higher speed, and finally forms a high-speed annular jet knife and a low-speed annular body in the axial direction. Numerical simulation When 2a = 90., as shown, the maximum velocity of the annular jet is 4260 m/s, and the average velocity of the jet head is about 3800 m/s.
The maximum speed of the jet target ring cutter is finite element model of the target plate. 3 Numerical simulation and analysis bookmark1 3.1 The shape of the opening angle of the coating is preferred. The ring cutter adopts a four-point detonation method. The detonation wave generated by the detonation point is downward and along the maximum penetration depth in the middle of the target plate, which is about 74.4 mm, and the target plate is not penetrated. The average cutting opening of the target was 28.3 mm. 2a = 90. The effect of the target after the annular cutting was as shown.
The maximum penetration depth is in the middle of the target plate, and the middle target plate is penetrated. The average cutting opening of the seesaw is 21.4 mm. 2 = 60. The effect of the target after the circular cutting is as shown.
=60) In the scheme, the detonation wave has a small pressing angle to the coating, the jet is slender and the relative mass is small, the head speed is high, the impulse of the jet to the target is mainly used for penetration, and a small part is used for the target. Reaming; when using the large cone angle (2 = 90) scheme, the detonation wave has a large pressing angle to the coating, the jet is short and the relative mass is large, the head speed is low, and the jet has a partial impulse to the target. It is used for deep penetration and a part for reaming of the target.
It can be seen from the simulation of the effect of penetrating the target plate at the opening angle of the two types of hoods. Under the 60 conditions, the jet head speed is high, the cutting diameter is narrow, the penetration depth to the target plate is large, and the relative impulse is high. The overall effect is better than the 90-type hood.
3.2 Shape of the shaped charge is preferred. The numerical simulation uses the three annular cutter charge shape schemes shown respectively. The opening angle of the liner is 60°, and the finite element model is as shown. The cutting effect of the three charging schemes on the target plate is as shown: the annular cutter composed of the three charging shapes has different effects on the target plate. After the combination charge detonation and cutting, a 1.8cm×8.4cm perforation was formed at the center of the target; the semi-cone could not penetrate the target; the platform body barely penetrated the target, but the cutting effect was not obvious.
Under the premise that the charges are basically equal and the simulation conditions are completely consistent, the reason why the annular cutter has a large difference in the cutting effect of the target plate is that the detonation wave (initially spherical wave) is affected by the shape of the cutter charge. The pressing speed and angle of the mask are as shown in 0. When the top of the charging is an oblique angle, the effect of the detonation wave on the coating is close to a plane wave, and the detonation wave is typical when the platform body is used. The curved wave thus affects the pressing performance of the coating cover; in addition, the semi-cone charge does not sufficiently press the bottom edge of the coating, which also affects the forming quality of the jet.
It can be seen from the simulation that the annular cutter detonation wave of the combined charge shape is more suitable for the coating of the drug cover under the equal charge quality, the relative impulse of the jet to the target plate is larger, and the cutting effect is more obvious. . In order to ensure a more ideal cutting effect, it is also conceivable to add a partition plate and an insensitive explosive in the charge to better ensure the plane forming effect of the detonation wave and improve the cutting efficiency.
4 Conclusions From the above simulation, the following conclusions can be drawn: 1 is the VonMises stress map near the cutting area obtained by numerical simulation. It can be seen that the high stress region (the lighter part in the figure) is mainly distributed twice as much as the cutting diameter. In the range. According to the traditional theory, the highest point of hardness can be considered as the range of high-speed deformation, so that the range of the three high zones of high temperature, high pressure and high strain rate can be estimated. The range of the three high zones obtained by experiments is about twice the diameter of the perforation. Therefore, it can be considered that the stress distribution obtained by numerical simulation is consistent with the traditional theory.
In addition, according to the relevant experiments, in the point detonation mode, the jet head speed is about 4625 m / s. The shape of the overall cutter also has a certain influence on the formation of the jet due to the different charges and experiments used in this model, but The jet head speed of the end face of 4706 m/s proves that the simulation is in good agreement with the experiment.
Through numerical simulation and combined with relevant experiments, the preliminary scheme of the annular cutter can be obtained: 1 the opening angle of the drug cover is 60; 2 the charge is in the shape of the combination.
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