Quantitative XRD measurements of the nanosized TiO2 particles obtained from the detonation soot have been carried out. The lattice parameters, such as grain size, cell volume, lattice constants and lattice strain were obtained. The relationships between the change ratio of cell volume (the reciprocal of the particles size, or the mass ratio of explosive and TiO2 precursor) and the lattice strain of the different TiO2 phases were also discussed. The relationship between the change ratio of cell volume and the particle size of TiO2 particles was also studied. The results demonstrated that with the decreasing of the particles size, the lattice strain of anatase phase increased, while the lattice strain of rutile phase increased firstly and then decreased to some extent. It is different from the linear relationship between the lattice distortion and the reciprocal of the particles size reported in other literatures. In the meantime, the lattice strains were different with the different mass contents of RDX in the microstructures of the TiO2 particles. The direct reflection of microstructure changes is the changes of the particle size of TiO2 particles. Based on the XRD results, the particular characteristics of the detonation process and interfacial effects of nanocrystalline materials, a crude explanation was also given.

Utilizing the raw materials of TiOSO4, NaOH, NH4NO3 and RDX, the TiO2 ultrafine particles were prepared under high pressure and high temperature by detonation method. The structure, composition and size distribution of the TiO2 ultrafine particles were systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results indicated the as-prepared TiO2 ultrafine particles exhibited spherical-like grains and that the average size of particles was 25.5nm. After being heated at 700 8C for 1 h, TiO2 particles have entirely completed the anatase-rutile phase transition, which means that detonation method can effectively enhance the anatase-rutile phase transition by lowering the transition temperature. The size of TiO2 nanoparticles can be effectively controlled because the as-prepared nanoparticles do not have enough time to grow to large and perfect crystallites during the detonation process.

The numerical program LS-DYNA, is used to simulate the process of the projectile with high rotating speed penetrating into the moving vehicular door. Because of the moving of the vehicular door, the projectile will turn, and the ballistic trajectory will migrate. The paper provides a method to calculate the projectile's angle of turning's curve. In the process of the penetration, the projectile's moving speed is 300 m/s, rotating speed is 0, 3600 n/s and 6370 n/s. The vehicular door's moving speed is 0, 40 m/s and 80 m/s. The projectile is the semi-sphere nose projectile whose diameter is 7.62 mm; the vehicular door's thickness is 2 mm. The material model is the JOHN-COOK material model that can characterize strain, strain rate hardening and thermal softening effects. Through comparing with the results by simulation to study the effects of the projectile's final velocity, the angle of rotation and the ballistic trajectory's migration with different projectile's rotating speeds and the vehicular door's moving speeds.