| The demolition warhead is a type of conventional warhead used to suppress and destroy enemy targets such as concentrated effective forces,artillery positions,airfield installations,command and communication systems,radar positions,etc.The warhead mostly explodes in a state of motion,and the state of motion affects the parameters of the breakup field and the shock field such that the distribution of the force field changes,which then affects the destructive power of the warhead.Currently,it is relatively difficult to conduct dynamic testing studies due to the limitations of the means of testing.Therefore,in this paper,we use the finite element computational software LS-DYNA to perform numerical simulations of the destruction effect of a demolition warhead on a steel target under static and dynamic explosion,The damage effect of static detonation and dynamic detonation on the target plate is compared,and the influence law of static explosion and dynamic explosion on the damage power of demolition warhead is obtained,which provides reference for the research of dynamic explosion power field and damage effect of demolition warhead.The main research contents of this paper are as follows:In order to study the propagation laws of static and dynamic shock waves,we have performed numerical simulations of the blast wave field with charge at different velocities and analyzed the propagation properties of static and dynamic shock waves.It is found that the pressure rising region and pressure falling region of dynamic detonation shock wave field are positively correlated with the charging velocity.Based on the simulation results,regression analysis was carried out on the simulation data of shock wave overpressure peaks with azimuth angles of 0°,90°and 180°,and the calculation model of static and dynamic detonation shock wave overpressure peaks was obtained,which could predict the shock wave overpressure peaks,It is possible to predict the peak overpressure of the shock wave at 0.3?R?1.In order to obtain the failure modes of steel plates under static and dynamic explosions,we performed numerical simulations of the damage effects of bare charge columns on steel plates under static and dynamic explosions.Dimensional analysis of the impact parameter of the bare charge column on the target plate under static and dynamic explosion was performed based on the extent of damage caused by static and dynamic explosion on the steel plate.The dimensionless damage number,D_m,is obtained for steel plates under static and dynamic explosion.The dimensionless damage number includes the thickness of the steel plate,the detonation distance,the warhead’s velocity of motion,and the warhead’s fall angle.Moreover,by fitting D_m to the flexural ratio,we obtain the flexural ratio as a function of D_m for both static and dynamic explosions of the slab.The deformation deflection of the steel plate can be predicted when the burst distance is greater than 20cm.The damage of the steel target plates under static and dynamic detonation of the warhead is compared and analyzed.It is found that the steel plate has petal-shaped rupture when the falling angle of the warhead is 0°-60°,the steel plate has shear and punching failure when the falling angle is 75°,and the steel plate has plastic deformation when the falling angle is 90°.When the warhead explodes dynamically,the steel plate is petal-shaped at all falling angles.The maximum fracture diameter of the plate is 81.83cm and the maximum energy of the plate is 5,325.5J in a static explosion.The maximum fracture diameter of the plate is 123.81cm and the maximum energy obtained by the plate is 75096.7J in dynamic explosion.The rupture diameter of a steel plate in a dynamic explosion is 1.51 times that of a static explosion,and the energy gained by a steel plate in a dynamic explosion is 1.36 times that of a static explosion.The results of this study can be used as a reference for the dynamical blast damage effect of a kill warhead. |
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