Numerical Simulation Of The Power Of HMX-based General Blasting Explosive Charged Warhead

As the payload of the weapon,the warhead is the executive body of the weapon system to achieve the damage to the target terminal and complete the final combat mission.The warhead charge,as the energy source of the overall warhead,has a direct impact on the overall damage power of the weapon.HMX-based general blasting explosive is a low-cost and high-energy explosive,which was newly developed by our group.In order to provide a theoretical basis for the application of the HMX-based general blasting explosive,a combination of numerical simulation and experimental methods were adopted:Its performance parameters were experimentally measured,and the JWL state equation parameters were determined by comparing cylinder test and numerical simulation results;Based on a scaled simplified model of a certain explosive warhead,numerical simulation,and theoretical calculation were conducted to determine the optimal operating conditions for the power parameters of fragments,and the shock wave power of this operating condition was numerically simulated and verified through experiments.The main research contents and results of this paper are as follows:（1）The detonation velocity,detonation pressure,and detonation heat of HMX-based general blasting explosive were experimentally measured,by using the methods specified in the GJB 772A-97 standard.In order to determine the JWL state equation of HMX-based general blasting explosive,a 25 mm standard cylinder test was conducted,and the curve of the cylinder wall expansion distance with time was obtained;Using AUTODYN for numerical simulation of this cylindrical test,the JWL state equation parameters of the explosive were determined through comparison between the experimental and numerical simulation results as follows:A is 1252.7 GPa;B is 12.72 GPa;R₁ is 4.9;R₂ is 1.1;ωis 0.26.（2）The Stochastic random fragmentation model in AUTODYN software was used to numerically simulate the power of fragments,which was based on the scaled simplified model of a certain explosive warhead,and power data of fragments under different operating conditions were obtained.The research results indicated that under the working condition of shell material 30Cr Mn Si and initiation method at one end,the power of the fragments is the highest,and the simulated average initial velocity of the fragments is 1805 m/s;The dispersion angle of fragments is 18.87°.（3）The LS-DYNA software was used to numerically simulate the shock wave power based on the scaled simplified model of an explosive killing warhead,under the working condition of a shell material of 30Cr Mn Si and an initiation method of one end detonation,and shock wave overpressure experiment was conducted on this working condition.The experimental results indicated that the peak overpressure values of the shock wave,which formed by the detonation of the scaled kill warhead,at distances of 1.5 m,2.5 m,3.5 m,4.5 m,and 5.5 m from the explosion center are 2.013 MPa,0.452 MPa,0.302 MPa,0.215 MPa,and 0.172 MPa,respectively.Based on the peak overpressure data of the shock wave obtained from the experiment,a formula for calculating the shock wave overpressure of the scaled warhead was fitted.The overall trend of the overpressure attenuation curve obtained from numerical simulation is roughly consistent with the experimental results,which proved the numerical simulation results can provide a theoretical basis for the shock wave power under this working condition.