In the study, a software program named “SUPER CE/SE” is developed for the simulation of hypervelocity impact problems with large deformations, high strain rates and spall fractures. In the software program, an Eulerian method consisting of an improved CE/SE (Space-time Conservation Element and Solution Element Method) scheme is used. A void growth model which takes the Bauschinger Effect (BE) into account and a newly proposed front tracking method are adopted in the simulation. The formation and propagation of a crack is described by a newly developed automatic crack growth algorithm. Numerical simulation of spall fracture in a plate when impacted by a spherical projectile at a velocity of 6.0 km/s is carried out. The numerical results are in qualitative agreement with the corresponding experimental data. It turns out that the BE has obvious influence on the length of the crack and better agreement with the experiment is obtained when the BE is considered. It is also validated that the newly proposed front tracking method is feasible and reliable for representing the cracks in the problems with large deformation and high strain rates. According to those research results, it is proved that the software program SUPER CE/SE is robust and effective in the simulation of hypervelocity impact problems.

A new kind of prism light guide is introduced in this paper. The guide is seamless and made by extruding technique, which makes it has lower cost. The cost of the guide is only about 15% of the price of prism films. The guide transport light by total internal reflection and the light-transporting principle is described in detail in this paper. In theory all light would be transported by the process of total internal reflection but irregularities in the guide cause a small proportion of light to leak out the guide. This effect can make the guide glow and for this reason the seamless prism light guide acts as both a light transport and emission device. The guide can be used in lighting or daylighting of underground buildings and windowless buildings, or buildings in which inflammable and explosive products are manufactured. It can also be used in nightscape lighting as a decorative lighting fixture. In this paper, the application of the guide in a concrete-curing room is introduced briefly.