In situ angle dispersive X-ray diffraction measurements for a natural epidote were performed with diamond anvil cell instrument and synchrotron radiation at NSLS (National Synchrotron Light Source).The maximal pressure in the experiment was 9.16 GPa.At experimental pressures, no evidence of phase tr...

Piston-cylinder apparatus is widely used for high-pressure and high-temperature experiments.Its thermal structure in the pressure chamber depends mainly on design and materials of the sample assembly.Here we present a thermal structure analysis on the 13 mm pressure assembly of a QUICKpress piston-c...

The microstructures of MgSiO₃ melt and their variation with temperature and pressure were investigated based on first-principles molecular dynamic simulations at high pressures (0-144 GPa) and high temperatures (2 000-6 000 K).The calculated first peak positions of the pair correlation function of O...

According to crystal lattice structures, a three-dimensional lattice physical mechanics model in constant volume state was built up to study the atom thermal vibration.The equation of thermal energy and external force on the thermal vibrating lattice was deduced absolutely from the principle of mech...

Based on the fact that the Lagrangian bulk moduli of many materials can be expressed as a second order expansion with respect to pressure, a four-parameter equation of state has been proposed which, in comparison with the three-parameter equation of state, can be applied to a wider pressure range an...

This paper studied the 3D Euler method of elastic-plastic hydrodynamics with the ideal elastic-plastic constructive model for debris clouds produced by hypervelocity impacts.Two cases were simulated that sphere and oblique cylinder impacting single plates.The simulation results were compared with ex...

In order to overcome the shortcoming of multipoint laser velocimetry such as low spatial resolution, system complexity and expensive cost, a high time-space resolution line-imaging VISAR for detonation physics was implemented, which was with response time of 400 ps and space resolution of 100 μm.Thi...

The reflection bunching characteristics analysis of underwater plasma sound source has an important guiding significance on the research and application of underwater directional radiation technology.The reflection rules of different surfaces were analyzed, and the bunching sound field distribution ...

In order to synthesize nano-ceria by detonation method, 5 kinds of emulsion explosives in which Ce(NO₃)₃·6H₂O acted as main oxidant were designed and prepared.Considering the effects of the content of Ce(NO₃)₃ on the detonation velocity of emulsion explosives and the yield of nano-ceria, the formula...

In order to study the reliability of underwater target structure subjected to underwater explosion, reliable sample data were obtained through many groups of experiments.Two methods including the stepwise polynomial regression method and the BP neural network method were presented to fit to these sa...

A kind of copper wire closed-packed structure was compressed by one-dimensional strain impacting and the dynamic process was numerically simulated.The laser displacement interferometer was used to measure the interface particle velocity profile and the effective experimental data of structure impact...

A study on hypervelocity launcher techniques was carried out on the two-stage light-gas gun with quasi-isentropic compression of the flier-plate material with graded impedance.A 25-millimeter diameter aluminum alloy projectile was accelerated over 11 km/s using the hypervelocity launcher, and a 10-m...

The 3D elastic-plastic hydrodynamic Lagrangian-Remapping two-step Euler method was used for the micro ejection simulation of aluminum.The micro ejection calculation models have grooves on the aluminum interface with the same depth and different angles, and the numerical results of the micro-jet mass...

The interaction of shock waves in ground burst was studied by experiment with various experiment layouts.Parameters of shock waves of two or three charges exploding simultaneously were measured using air explosion test system.The results show that the shockwave overpressure and impulse are enhanced ...

The experimental and simulation studies were carried out for the 4 different nose structures of rod penetrator oblique penetrating into three-layer laminated target.For the different types of nose structures, the ability of their penetration was assessed by crater formed in the erosion of quality as...

The mechanism and damage evolution of high pressure water impaction on coal were numerically simulated using the method of coupling smoothed particle hydrodynamics(SPH) method with standard finite element method (FEM).The numerical computation model of high pressure water was a cylinder whose length...

High-density polyethylene (HDPE) melt and linear low-density polyethylene (LLDPE) melt were solidified through three kinds of experimental processes, including rapid compressing, natural cooling and quenching, and then the microstructure of samples was investigated.The results show that the crystall...

In order to research the characteristic of how the scale of series composite charge explosives (JO-9159/JB-9014) affect energy output, FEM software AUTODYN was used to simulate the plane flyer test, and relevant experiments were carried out to verify the result of analog.It is showed that the relati...