Nanometer carbon/zirconia compound powder was synthesized via novel shock wave plasma technique. X-ray diffraction and Raman spectrum were respectively used to characterize the crystal phase composition of the compound powder. Transmission Electron Microscope was used to observe the size and appearance of the as-synthesized powder, precursor and the as-synthesized product. The composition of the compound were tested through DTA/TG analysis. The preparation mechanism was also discussed. The results indicated that the carbon/zirconia compound powder of 10 nm in diameter was synthesized via shock wave plasma technique. The components of the compound powder include 63% (mass fraction) graphite and 37% tetragonal zirconia.

Based on the energy conservation relation and some assumptions, an one-dimensional physical model is proposed to predict the velocity of the metallic flyer plates driven by magnetic field. In this model, the dynamic change of the inductance in work space, the ablation energy and the magnetic field energy produced during the process of magnetic driving are considered. Three experimental examples are used to verify the validity of the model. The results show that the model can accurately predict the velocity of the flyer plates under the conditions of no shock formation and no obvious internal energy accumulation in the plates.

Under the irradiation of power laser, the material of solid target surface evaporated instantly and then the vapor plasma of target generated, coupling the energy of laser beam with plasma during the laser go through the plasma field to arrive at the target surface were the main physical process of laser interaction with plasma. A general Godunov finite difference schemes-WENO (Weighted Essentially Non-Oscillatory) schemes which have fifth-order accuracy is used to perform a numerical calculation for 2-dimensional axis symmetrical laser-supported plasma flow field under laser ablated solid target. The models for the calculation of ionization degree of plasma and the interaction between laser beam and plasma and the simplified EOS (equation of state) of plasma are considered in the simulation, the energy of laser absorbed in the plasma and the shielding effect of plasma were analyzed. Simulation results showed that the main portion of laser energy was used to drive the plasma flow, the shielding effect played an important role in the coupling of laser and plasma, the variation of the duration time of laser pulse could adjust the shielding effect which influenced the coupling of laser energy and plasma.

The govering equation of hydrodynamics are discreted over time. Using a VISAR trace as “initial conditions”, they are numerically integrated backwards in space. A detail analysis shows good precision has gotten. The traced pressure load history at load surface is consistent with Bai’s results. The deduced stress-strain behavior of copper agrees well with the isentropic used in Bai’s code.

Numerical simulations are conducted on the perforation of aluminum targets struck by an ogive-nosed steel projectile using the commercial FEM code ABUQUS/Explicit. It is assumed that the target response can be represented by a velocity dependent forcing function which is derived from spherical cavity expansion (SCE) analysis. Free surface effects are also considered and a modified forcing function is used in numerical simulations. This approximation eliminates the need for discretizing the target as well as the need for a contact algorithm. It is shown that the numerical simulations are in good agreement with the experimental data for 6061-T651 aluminum alloy targets struck by a VAR 4340 steel projectile.

Standard cylinder test technique and data processing method were studied, and new effective techniques of lighting, negative interpretation and data processing for slit scan experiments were established, and the results of displacement, velocity, acceleration and specific kinetic energy of the cylinder wall particle with high precision and abundant information were obtained. VISAR was used to measure the cylinder expansion velocity and displacement simultaneously. The obtained results are consistent with those from slit scan experiments. The testing reliability was further improved.

Deformation experiments have been conducted to investigate the brittle-plastic transition of quartzite under temperature of 500~1 000 ℃ and confining pressure of 1 251~1 440 MPa. Mechanical behavior and microstructural characteristics indicated that the brittle-plastic transition of quartzite in experimental condition underwent three deformation mechanisms, namely the semibrittle faulting, semibrittle flow and plastic flow. At least two transitions of deformation mechanism were involved with increasing temperature. The first is the transition from semibrittle faulting to semibrittle flow at 700~800 ℃, and the second is the transition from semibrittle flow to plastic flow at 900~950 ℃. In comparison with the similar results reported by Hirth and Tullis (1994), the temperatures of two transitions we determined is higher by 100 ℃ than Hirth and Tullis’ results. In addition, coesite was found in the thin section of severely deformed plastic flow samples.

The SrAl₂O₄:Eu²⁺, Dy³⁺ (SED) nanometer phosphors were synthesized at lower temperature by detonation and combustion method, respectively. The effects of synthesis conditions, annealing temperature on the growth behavior, the particle morphologies and optical properties of the as-prepared SED particles were contrasted. It was showed that the mean size of the SED particles prepared by detonation method increased gradually with increasing heat treatment, and that the mean size of the SED particles prepared by combustion method decreased firstly and then increased quickly and had a minimal value at 600 ℃. The mean size of the SED particles prepared by detonation method increased more quickly than that of the SED particles prepared by combustion method at same annealing temperature. Finally, the mechanism for the long afterglow was discussed and some suggestions on how to improve the synthesis methods were also presented.

On the basis of plane shock wave hypothesis, the characteristics of local cavitation and bulk cavitation formation subjected to underwater explosion were theoretically and experimentally studied. The effects of structure dimensions and shock wave parameters on the cavitation formation were analyzed theoretically. Aiming at validating the local cavitation theory, an underwater explosion experiment in a 5-m diameter columned water tank was carried out. The explosion layout was as follows: 50-g TNT charge was placed at a 1-m stand-off away from a 1-m square and 2-mm thick steel plate. Results show that different structure dimensions can affect significantly the formation of local cavitation under the same shock wave parameters, and the quantity and depth of charges play an important role in the bulk cavitation formation. The experimental results basically agree with those of theoretical analysis.

In conventional Split Hopkinson Pressure Bars (SHPB) experiments, the tension pulse reflected from the sample back into the incident bar will travel to the free end of the bar and then will reflect back to the sample as compression wave. As a result, the sample is loaded many times. The single-pulse loading technique of the Hopkinson pressure bars can solve the problem. This paper presents the basic principle of the single-pulse loading technique of Hopkinson pressure bars. The way to calculate the pre-fixed gap between the transfer flange and reaction mass is given. The experimental results with various pre-fixed gap are obtained. A device of the single-pulse loading technique is set up. High speed photography is applied to confirm the validation of the technique. Both the photoes and the experimental strain waves show that sample was loaded only once.