The effects of heating temperature and duration time on the process of ZnO crystallization under the pressure of 5 GPa are studied systemically by the methods of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The experimental results show that the diffusion rate of ZnO increases greatly under high-pressure and the sample density higher than 99% of the theoretical value can be achieved after heated at 400 ℃ and 5 GPa for 0.5 h. With the increasing of the heating temperature, micro-cracks develop along crystal boundary in all samples, and eventually ZnO powder mixed with single crystals and poly-crystals forms above 500 ℃. The pale yellow crystallites with an average size of 100 μm and the largest size more than 350 μm was obtained at 850 ℃ after heating of 5 min. The sample morphology analysis shows that the reason for the ultra fast crystallization of ZnO under high-pressure is possibly caused by a very quick diffusion rate of ZnO along certain direction. The crystal boundary along such direction moves very quickly under high-pressure until the neighboring micro-crystals merge into a single crystal in a short time, while the micro-crystals shrink in the other direction and cause micro-cracks along other crystal boundaries.

Planar detonation wave was generated to load the DT2 iron and HR2 steel cuneal sample by detonating TNT. Macroscopical crack perpendicular or 45° angle to the load interface was found in recovered HR2 steel sample and irregular fracture at back surface was found in recovered DT2 iron sample. Metallographic structure observation, microhardness measurement of recovered sample and numerical simulation indicate that there was no shock-induced phase transition in HR2 steel but local incomplete phase transition in DT2 iron. The failure difference between the two materials may be caused by local incomplete phase transition.

Ba₂CuO₂Cl₂ was synthesized under high pressure. The crystal structure stability of Ba₂CuO₂Cl₂ was investigated under high pressure. It shows that Ba₂CuO₂Cl₂ is stable in the studied pressure range but with a relative large anisotropic compressibility.

By a self-made system based on a cubic anvil high-pressure apparatus and an Agilent 4294A accurate impedance analyzer, real time high frequency dielectricity measurement under hydrostatic pressure is realized by the standard four-wire method widely used in ambient pressure dielectric research. The sealing of liquid cell in solid pressure-transmission medium and multi signal lines out through gaskets including four micro-coaxial cables is achieved by the pre-formation of pyrophyllite cube together with gaskets. The testing fixture, 10 mm×10 mm sample, pressure-temperature sensors and as many as 16 signal wires including 4 micro-coaxial cables with an outer diameters of 1.6 mm respectively can be contained simultaneously in a liquid testing cell with a volume of (Ø13×15) mm³. Four-wire impedance spectroscopy can be obtained by this system in a measurement range of room temperature to 300 ℃, ambient pressure to about 3 GPa hydrostatic pressure and testing frequency from 40 Hz to 5 MHz with an experiment error below 3%. The pressure induced ferroelectric-paraelectric phase transition of a BaTiO₃ single crystal is observed using this setting up.

One-dimensional shock loading on the material can be realized using the technique of laser-driven macro-flyer plate and is of applications to the research of high pressure equation of state (EOS) and dynamics under high strain rate. A table-sized pulse Nd: YAG laser was used to drive macro-flyer in this work. The influence of flyer configuration on its flying parameters was experimentally researched. The experiments show that the energy coupling efficiency of flyer plates in complex configuration is improved, relative to the single foil configuration which the average velocity of flyer plates is enhanced by 15%~30%, furthermore, the integrity and planarity of flyer plates in complex configurations are better than those from single foil configurations. The startup relaxation time of flyer is measured to be within 5~10 ns. The planarity of flyer was measured and the results show that time difference of flyer in the range of 1.0 mm is within 20~30 ns. The flyer velocity history was measured and the results show that the flyer has been accelerated to 90% of its terminal velocity in 20 ns.

Aimed at idiographic conditions of launching target in excess of launching capability in DAVIS gun experiments, two ways of improving DAVIS gun launching capability for enhancing efficiency and exerting function of DAVIS gun, and the interior ballistic performance was assessed. The ballistic analysis can be regarded as the foundation and reference of improving DAVIS and other guns' launching capability.

The pressure-shear plate impact experiments have been performed on 95% Al₂O₃ ceramic using 57 mm diameter compressed gas gun. The high-pressure gases drove the ceramic flyer to impact the oblique target to produce pressure-shear loading, and the particle velocity is traced by embedded electromagnetic velocity gauge. The inelastic behavior and shear wave propagation of ceramics under combined compression and shear loading have been probed in ceramic. The lateral particle velocities show an attenuation of shear waves with increasing of impact load. From the experiments, we found that when the compression stress reached about 4.86 GPa, 95% Al₂O₃ ceramic started to produce little amount of cracks and holes. The shear waves also began to attenuate.

The dependence of the sublimation energy on temperature and pressure was studied based on universal thermodynamics. The result shows that the sublimation energy decreases linearly with the increasing temperature or pressure. The blow-off impulse of aluminum induced by pulsed X-ray was simulated by smoothed particle hydrodynamics (SPH) method, and the influence of sublimation energy on impulse was discussed. In contrast to the situation that sublimation energy is a constant, the numerical result shows that the blow-off impulse of aluminum will increase obviously if the change of sublimation energy with temperature and pressure is considered.

The oblique hypervelocity impacts of space debris on bumper of spacecrafts were studied through 2017 aluminum spheres impacting on thin 2A12 aluminum alloy sheets at different angles. The penetration hole characteristics of single-wall shields and the ricochet characteristics of projectiles were analyzed. The equations for the hole size of oblique hypervelocity impact penetration into thin aluminum alloy sheets were derived. Impact velocities were 2.58 km/s, 3.56 km/s and 4.31 km/s respectively. Impact angles ranged from 0° to 80°. The results indicated that the penetration hole size in thin aluminum alloy sheets depended on the impact velocity and impact angle. When an aluminum alloy sphere of 3.97 mm diameter impacted at hypervelocity on the thin aluminum alloy sheet of 1 mm thickness at different angles, the critical impact angle was between 30° and 40° in which projectile leaped away from the target partially. As impact angle increased, the maximum ricochet angle decreased, and the distributing area of ricochet debris cloud reduced. Impact velocity has little effect on the penetration hole ellipticity of thin aluminum alloy sheets under oblique hypervelocity impact.

The continuum damage model which was originally developed to study rock fragmentation was implemented into the transient dynamic explicit finite element code LS-DYNA3D, and then the code is used for the numerical simulation of projectiles' penetrating the concrete. The possible traces of the projectiles in the target are investigated and the factors dominating the trace are found.