The behavior of 98 wt% hydrogen peroxide in delay period under shock loading was researched by optical transmissivity in-situ detection system. The time evolution of the transmissivity of 98 wt% hydrogen peroxide in the delay period is firstly presented. The experimental phenomenon shows that when the shock pressure in hydrogen peroxide reaches the ignition level, a large number of clusters will be produced inside the hydrogen peroxide. The formation of new clusters provides the reserve of energy for ignition. Those clusters formed by hydrogen peroxide in the delay period may act as hot spots, which leads the homogeneous explosives to reach the heterogeneous state before ignition. This conclusion is reasonable for revealing the ignition mechanism of homogeneous explosive. The particle behavior in the delay period gives us a new method to detect the ignition pressure. The experiments also confirm that the ignition pressure of 98 wt% hydrogen peroxide is just between 9.3 GPa and 12.1 GPa.
Water freezing is a crucial physical phenomenon. The process of ice forming, and the estimation of the ice nucleation rate also have important applications. However, until now, the experimental phenomenon...
The phase transition behaviors of the shocked water are investigated by employing an optical transmittance in-situ detection system. Based on the light scattering theory and phase transformation kinetics, the phase transition mechanism of the water under multiple shocks is discussed. The experimental data indicate that the evolution of the transmittance of the shocked water can be broadly divided into three stages: relaxation stage, decline stage, and recovery stage. In the early stage of the phase transition, the new phase particles began to form around the quartz/window interface. It should be mentioned that the water/ice phase boundary seems to move toward the liquid region in one experiment of this work. Due to the new phase core being much smaller than the wavelength of the incident light, the transmittance of the sample within the relaxation stage remains steady. The decline stage can be divided into the rapid descent stage and the slow descent stage in this work, which is considered as the different growth rates of the new phase particle under different shock loadings. The recovery stage is attributed to the emergence of the new phase particles which are bigger than the critical value. However, the influence of the size growth and the population growth of the new phase particles on the transmittance restrict each other, which may be responsible for the phenomenon that the transmittance curve does not return to the initial level.
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