Detonation Reaction Characteristics for CL-20 and CL-20-based Aluminized Mixed Explosives

et al. 2022

J. Phys.: Conf. Ser.

In order to study the detonation growth characteristics of the cast CL-20, shock initiation experiments were carried out. The ∅50mm samples content of 84wt% CL-20, 5wt% mental fuel and 11wt% HTPB binder were prepared. The one-dimension Lagrangian gauge measuring method was used to obtain the pressure histories of the cast CL-20. The results showed that when the loading pressure decreased, the growth of the leading shock wave speed and the front pressure of the explosive slowed down and the time to form a stable detonation was longer. The binder elastomer network effectively reduced the shock wave sensitivity of the cast CL-20 and the critical initiation pressure is 1.40GPa∼2.17GPa. A two-dimension axisymmetric shock initiation numerical model was established. The adaptive genetic algorithm compiled by MatLab was used to call the nonlinear finite element fluid dynamics software (LS-DYNA) to calculate the reaction rate equation parameters of the ignition growth model of the cast CL-20 combined with the results of shock initiation experiments.

“…The commonly used shock Hugoniot is the relationship between the shock wave velocity D and the particle velocity u. The general form [6][7]14] is Equation (2).…”

Section: Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on Detonation Growth Characteristics of the Cast CL-20

Fan

et al. 2022

J. Phys.: Conf. Ser.

“…The metal accelerations produced by the C-1 explosives with densities of 1.916 g/cm 3 , 1.924 g/cm 3 , and 1.945 g/cm 3 were investigated in the confined-plate push test. The velocity vs. time of the copper plate accelerated by the 1.924 g/cm 3 C-1 explosive is plotted in Figure 3.…”

Section: Metal Accelerating Ability For C-1 Explosivementioning

confidence: 99%

“…The addition of aluminum powders to the explosives can increase the total reaction energy [2]. However, because of the very short CL-20 detonation reaction zone, most of the aluminum particles would react with the detonation products after the detonation front [3]. Therefore, it is important to know if the late energy release of the aluminum reaction contributes to metal acceleration.…”

mentioning

confidence: 99%

Aluminum Acceleration and Reaction Characteristics for Aluminized CL‐20‐Based Mixed Explosives

Liu

Propellants Explo Pyrotec

Wang

et al. 2018

Self Cite

The effects of aluminum mass content and particle size in CL‐20‐based aluminized explosives were investigated with a small‐scale confined plate push test. The confinement strength of the detonation products was enhanced to twice that of cylinder tests to accelerate the aluminum particle reaction. An all‐fiber displacement interferometer system for any reflector was used to continuously measure the plate velocity over time. A series of aluminized explosives containing various aluminum particle masses and sizes were tested, as well as explosives containing LiF instead of aluminum. Numerical simulations of explosive detonation and metal plate acceleration were performed, where parameters for the equation of state of the detonation products were calibrated by comparing the results with experiment. The results indicated that most of the aluminum particles (including 200‐nm diameter particles) reacted with the detonation products after the Chapman‐Jouguet point. Moreover, the released energy from the reaction could further accelerate the metal plate and increase the acceleration time, although the initial plate velocity was reduced. The start reaction times of small particles were earlier than that of larger particles. Specifically, 2‐50‐μm aluminum particles start to react when the volume of detonation products expanded to 1.24 times the initial volume, while the 200‐nm particles start to react at 1.07 times the initial volume, with a significantly higher reaction rate. The reaction rates decreased with increasing mass fraction of reacted aluminum and a decrease in pressure.

“…However, associated detonation energy is affected by the particle size, activity and shape of the aluminum powder. The conclusion, that micro-aluminum powder has no reaction in detonation reaction zone, but releases energy through secondary reaction during the expansion of detonation products, can be drawn based on investigation [1][2]. The energy releasing rate can be greatly increased by nanoaluminum powders due to the small particle size and large specific surface area.…”

Section: Introductionmentioning

confidence: 99%

Effect of Aluminum Powder on Underwater Explosion Performance of CL‐20 Based Explosives

Hu¹,

Propellants Explo Pyrotec

Yan³

et al. 2019

Self Cite

The influences of particle size distributions of the nano and micro‐aluminum powders on the underwater explosion were analyzed experimentally. Both shock waves and the second pressure pulses induced by the CL‐20 based explosives were measured. Furthermore, the shock wave energy, the bubble energy, the reacting quantity of aluminum powders in the CL‐20 based explosives during the detonation and secondary reaction processes were calculated. The results indicate that: the nano‐aluminum powders have significant influences on both the detonation reaction and the secondary reaction, leading to the higher peak pressure of the shock wave while the lower peak pressure and narrower pulse width of the secondary pressure pulse; the gradations of both nano and micro‐aluminum powders improve the energy outputs of the explosives; the nano‐aluminum powders enhance the shock wave pressure while the micro‐aluminum powders maintain higher bubble energy.