Hydrogen under extremely compressed conditions exhibits extraordinary richness in physics and chemistry.Its structural transitions and phase diagram are fundamental for understanding the high pressure behavior of condensed matters, and also for important applications in astrophysics and material sci...

Three-dimensional polymetric cubic gauche nitrogen (cg-N) combined with covalent N─N single bonds is an ideal high energy density material (HEDM).A series of solid molecular state-to-solid molecular state transitions (β-δ-ε-ζ-η) in nitrogen were observed in experiment upon pressurizing the molecular...

The lattice constant and mechanical properties of cubic BC₃ under ambient and high pressure, including the elastic constants, the elastic modulus, and the mechanical anisotropy, were investigated using the first principle method in the framework of the density functional theory.The thermodynamic pro...

As a class of stable low-resistivity and high-temperature materials, tantalum disilicide (TaSi₂) has been widely used in integrated circuits.Therefore, its electrical stability is as important as its structural stability.Here, we report the electronic transport properties of TaSi₂ based on structura...

The structural stability of LiAlH₄, a promising hydrogen storage material, under high pressure was researched using the ab initio pseudopotential plane wave method.It is found that the phase transition occurs at 1.6 GPa from the α-LiAlH₄ phase to the β-LiAlH₄ (space group I2/b) phase.This phase tran...

In this research we presented a novel method based on frequency domain interferometry to in situ measure the cupping deformation of diamond anvils under high pressures.First we introduced the working principle of the cupping deformation measurements based on the frequency domain interferometry, and ...

In the present work MoWC₂ was successfully fabricated under 5.0GPa/2000K with a holding time of 60min using, as the synthetic raw material, molybdenum, tungsten and graphite powder (whose purity are more than 99.8%).Then the physical properties of the synthesized samples were characterized using X-r...

Due to its wide range of applications as a superhard material, polycrystalline diamond (PCD) has been used in oil-and gas-drilling, tool cutting, making of wear-resistant parts.At present, the average size of industrial synthetic PCD is above the micron dimension, but synthesizing the PCD with a siz...

In the present work, pure polycrystalline cubic boron nitride (PCBN) sintered bodies were synthesized under different high pressure sintering conditions using 10 μm-sized cBN grains.The microstructure of the sintered pure PCBN bodies were investigated using the scanning electron microscope (SEM) and...

An aluminum bar with a dense degree of over 98% was fabricated using nano-aluminum powders in an improved sintering device capable of pressure relief to study the sintering molding of nanometer metal powders.First, the performance of the sintering aluminum bar at different detonation velocities were...

In present experiments, nitrate salts, sodium silicate, anhydrous ethanol and RDX were mixed with a certain proportion, and the detonation synthesis of FeO doped silica coating iron nano particles was completed in a closed container with argon as the protection gas.The composition, morphology and ma...

Sandwich cylinders cored with aluminum foam have been widely applied in the fabrication of blast protection containers.The experiment under internal blast loading was performed and, based on the Voronoi technique, finite element models of sandwich cylinders were constructed and then used to simulate...

Based on the numerical model established using the ALE algorithm in consideration of the influencing factors of the water surface and the water bottom, the shallow water explosion in different explosion depths was simulated using LS-DYNA, and the credibility of the simulation results were verified b...

To study the influence of the plexiglass-air interlayer structure on underwater explosion vibration, the foundation vibration signals for this structure caused by underwater explosion in the small pool (5.5 m in diameter and 3.62 m in height), the influence of different air interlayer thicknesses on...

Flyer shock-initiated HNS-Ⅳ explosive is an important topic in the research of the in-line explosive train.In this study, with the influence of the energy loading method, which may be electrical explosion, laser and micro charge detonation, and flyer material on the shock initiation taken into consi...

The prediction of the penetration depth of concrete in concrete damage effect is of great significance to the design and construction in protection engineering.However, the traditional methods for this prediciton involve such problems as requiring a great supply of samples, or suffering from a large...

Hypervelocity penetration is an important issue for a weapon designer and protection engineering experts.With the increase of the impact velocity, a projectile may transition into a fluid penetration phase, and its depth of penetration (DOP) no longer rises monotonously with the velocity.Numerical s...

In order to reduce the bullet destruction, the design of shrapnel, a new type of bullet based on the standard small bore bullet, is proposed.We performed the experiment of water penetration of the shrapnel to study the deformation of the projectile head at different speeds, and conducted the corresp...

In this paper, the influence of the aspect ratio on the penetration resistance in the target penetration process of the warhead was studied based on the classical cavity expansion theory, the modified Forrestal resistance model and the acceleration resistance model.The influence of the aspect ratio ...

The process of wedge-shaped charge's interference effect and that of sandwich charge's on the jet were numerically simulated using ANSYS/LS-DYNA software.The influence of the wedge angle and that of the charge mass on the velocity and the declination angle of the jet head, the velocity of the slug w...

The processes of shaped warheads penetration of post-impact targets with reaction armor at different flight speeds (150, 200, 300, 400, 500 m/s) and in different penetration angles (30°, 45°, 60°) were simulated using the LS-DYNA program, and the interference of the jet and the result of its penetra...

In this study, the deflagration and detonation parameters of RP-3 aviation kerosene in a vertical shock tube, 200 mm in inner diameter and 5 400 mm in height, was measured at different initiation energies, spray pressures and equivalence ratios in direct ignition by a high explosive to further explo...

Setting spoilers in the tunnel is an effective way to accelerate its shock wave attenuation.In order to investigate the influence of the spoiler structural parameters on its shock wave's attenuation, numerical simulation was carried out using the ANSYS/LS-DYNA finite element software.First, based on...