| Popis: |
The effects that occur after penetration of a vehicle armor are referred to as behind armor (BA)effects. These effects are often not taken into account in the performance description of shaped charges (SC). A total view of the performance of a SC offers the possibility to better describe them. For this purpose, a basic experimental concept was developed to characterize the effects. In addition, copper (Cu) and aluminum (Al) and their combination were chosen as liner material. Hydrocode SPEED simulations have been performed in 90 mm caliber, which serve as a basis for the design of the liners. For the production of the bimetallic liner, a Cu liner was coated with cold gas spraying using Al. First, jet penetration performance in mild steel and its velocity were measured. In the second part, the effects that occur behind the armor were examined in more detail. Pressure and temperature were measured in a specially designed pressure tube at different target strenghts (50 mm, 100 mm and 300 mm) and the residual performance was recorded. The same approach was used to characterize the fragments. After a series of 28 tests, it can be concluded that, in contrast to Cu, the Al liner has a measurably greater effect behind the armor. On the one hand, the measured temperature difference between the two liner (Cu; Al) was above 1000 deg C. On the other hand, as expected, the penetration performance of the Al liner amounts to 60% of the Cu liner. The evaluation of the witness plates shows that the BA effect of the Al liner is more powerful. It was shown that the fabrication of a bimetallic liner by cold gas spraying leads to a functional shaped charge. Furthermore, it was shown that the performance of the bimetallic liner lies generally between the respective values of the monometallic liner. In conclusion, it was demonstrated that the experimental setups provided the opportunity to investigate the individual characteristics of the respective shaped charges and to work out differences. |
