A kind of charge structure for multiple explosive forming projectile is put forward to improve the directional destruction effect on targets. The plane wave produced by shock initiation and initiation styles effecting on damage ability are simulated by LS-DYNA and tested. Results show that MEFP charge with VESF initiation has many advantages, such as higher velocity EFP, higher directionality and being easy to initiate charges of large ratio of height to diameter.

Aiming at the loading problem of electromagnetic force in structural analysis for the electromagnetic launcher and the untrue phenomenon obtained by common node method, a contact algorithm mixing multi-point constraints with augmented Lagrangian is proposed for numerical analysis of 2D magnetic-structural coupling for the electromagnetic rail launcher. Results indicate that the changing trends of the electromagnetic force on the rails and the maximum magnetic flux density are similar to that of the loading current. Material matching affects the dynamic response of the launcher greatly. This method results in loading on the rail more reasonably and avoiding the untrue tensile stress at some conjoint areas. A useful method for structural analysis of the electromagnetic launcher is provided.

Due to the requirements of detonation research, a two-stage light gas-gun system and corresponding measurement system has been designed. Using this two-stage light gas-gun system, RHT-901, JOB-9003 and TA01 explosives were impacted by a spherical and cylinder projectile through a steel plate in a series of experiments. The experimental results showed that the experimental system is easy to handle and can be widely useful in the detonation experiment.

The hardness, elastic modulus and plastic deformation of the 7075 aluminum alloy before and after 4 GPa pressure treatment are measured by nano-indenter, and combined with the observation for the microstructure. The effects of high pressure treatment on micro-mechanical properties of 7075 aluminum alloy are investigated. The results show that 4 GPa pressure treatment can increase the hardness and elastic modulus of the 7075 aluminum alloy, and decrease its plastic deformation. As a result, the non-deformability of the alloy is improved effectively.

Based on the aged solid high explosive, a series of experiments were performed to study the influence of thermal aged on the detonation performance for JOB-9003 explosive. The physical and detonation performances were contrasted for the new and aged explosive samples. The results indicated that the quality and density of the sample have a slight decrease, and the inner and outer diameter of the sample have a slight increase after 180 d aging. It was also found that the time gap defining as the gap between detonation-wave propagating at the outer surface is very small. The only change is that the detonation wave velocity has a slight decrease for the aged samples. Therefore, it could be affirmed that the detonation performance is not changed obviously by accelerated aging 180 d.

The process of metal perturbation growth includes complex material dynamic response like great distortion, high strain rate and high pressure loading, etc. The modified Smoothed Particle Hydrodynamics (SPH) combining with dynamic constitutive behavior of metal wass used to simulate the perturbation growth with different initial amplitude of the perturbation. The influence of shear modulus and yield strength to the perturbation growth was studied. The calculated results indicate the method can also solve the metal perturbation growth problem well.

In order to explore the effects of high pressure processing on the extraction of essential oil rich in nootkatone, the citrus Changshan-huyou peels are used as the experiment material. Based on the single factor experiments, 4 main parameters, such as pressure (200~600 MPa), holding pressure time (5~25 min), liquid-solid ratio (10~30 mL/g) and grinding degree (20~60 mesh) are studied. Then 3 out of the 4 parameters are optimized by response surface methodology. The results can be demonstrated as follows: when the pressure, liquid-solid ratio, grinding degree are 300 MPa, 20 mL/g and 30 mesh respectively, the nootkatone content in the essential oil reaches the peak of 20.50 mg/g. The results indicate that high pressure processing can extract the noootkatone from essential oil of pomelo peel effectively. In conclusion, it is a time and energy-efficient method to extract essential oil from pomelo peel.

Here we briefly review the effects of pressure on what we have discovered about “111” iron based superconductor. The record high superconductor transition temperature (T_c) up to 31 K in “111” system is reached with applied pressure. The isostructural evolution with applied pressure reveals an intimate link between the Fe—As—Fe bond angle and bond length as well as the pressure-tuned superconductivity of “111” system using a synchrotron X-ray powder diffraction technique.

Measurements of compressional and shear wave velocities (v_p and v_s) under pressure from 0.4 to 2.0 GPa were performed on seven types of synthetic glasses, including basalt, andesite, dacite, amphibolite, pyroxenite, rhyolite and gneiss. At confining pressure of 2.0 GPa, the wave velocities were also measured as functions of temperature up to 1 000 ℃ for compressional wave velocity (v_p) and up to 730 ℃ for shear wave velocity (v_s). At room temperature, the wave velocities of the glasses decrease anomalously with pressure, as a result of the open structure of SiO₂ in silica-rich glasses. With varying SiO₂ mass fraction in the glasses from 87% to 52%, ∂v_p/∂_p increases from -0.159 to 0.050 μm/(s·Pa), and ∂v_s/∂p increases from -0.114 to -0.001 μm/(s·Pa). At 2.0 GPa, v_p and v_s of the glasses decrease slowly first up to 600-700 ℃, indicating the glass transition temperatures (T_g), and then decrease rapidly. Based on the elastic properties of basalt glass and mantle rocks, it is concluded that the basalt glass with volume fraction of about 20% in matrix can cause the low velocity zone in upper mantle.

In-situ Raman measurement of water has been conducted at the temperature of 300 K and the pressure of 0.1-1 400 MPa using a SiC anvil cell. The experimental results show that the frequency of liquid water ν₁ decreases with increase of pressure (p), and two discontinuities are observed at about 200 and 620 MPa. Therefore three states of water are recognized. From state Ⅰ to state Ⅱ then to state III, the value of |dν₁/dp| reduces, indicating that the compressibility is related to the pressure, and it is becoming more difficult to compress as the pressure is increasing. The connection mode of a water molecule with its neighboring water molecules changes as the pressure increases. The discontinuous property of water suggests a possible liquid to liquid phase transition and structural change at 200 and 620 MPa.