Investigation On Explosion Energy Output Characteristics And Action Of Blast Waves With Objects

In this dissertation, the experimental investigations, theoreticalanalysis and numerical simulations are carried out to study the explosionenergy characteristics of TNT, insensitive RDX and aluminized explosivesunder circumstances of underwater, confined field and the case in air,obtained the rules of dynamic response of blast chamber under internal blastloadings and targets under air-blast loading and contact explosion.The experimental research was carried out on the energy outputcharacteristics of TNT, insensitive RDX and aluminized explosives (RAl-1 andRSAl). The results show that: Pressure attenuation of aluminizedexplosives-RAl-1 and RSAl is lower than ideal explosives-TNT and insensitiveRDX, and shock wave energy, bubble ripple time and bubble energy of RAl-1 andRSAl is higher than those of TNT and insensitive RDX.The experimental research was carried out to study the characteristicsof blast loading by insensitive RDX and aluminized explosives (RAl-1 and RAl-2)in blast chamber. The vibration frequency spectrum of flat end plate andcylindrical shell had been analyzed, and vibration mode of those was obtained.The vibration frequency spectrum and strain was analyzed under the effect ofdifferent explosives, and the relation between blast loading and dynamicresponse of chamber was discussed. The numerical simulation was conducted tostudy the internal blast loading of explosion chamber with flat end using TVDschemes, and the rule of inner blast field and relation of pressure and timewere gained. By nonlinear explicit dynamic finite-element code, dynamicalresponse of cylindrical blast chamber subjected to internal blast loading wasnumerically simulated.According to TNT, insensitive RDX and aluminized explosive RAl-1 blastexperiment, the parameters (overpressure and impulse) on the target wereobtained. The dynamic response of a target subject to blast loadings has beensimulated using the experimental overpressure data of RDX and DHL as inputparameters. The relation between characteristics of blast loading and dynamicresponse of a target had been analyzed.Using the fiber-optic probe technique, the time when the shock wave reached the different places in steel plate, aluminum plate, steel-aluminumplate and aluminum-steel plate under contact explosion with insensitive RDXand aluminize RHTL had been separately measured. And the attenuation rule ofshock wave, which produced by the insensitive RDX and RHTL separately, in theabove four materials have been obtained by the Hugoniot relation of eachmaterial. The simulation on the contact explosion between insensitive RDX anddifferent plates shows that if the selection of detonation parameter and stateequation parameter is appropriate, the parameters can forecast the shock wavepropagation rule in the objective plates.