Analysis of metal matrix composite (MMC) applied armor system

A combined analysis has been performed for the penetration of a long-rod into MMC/Ceramic layered armour systems with several shot test and a series of simulations. Metal Matrix Composites (MMCs) can be a potential candidate for military applications due to the light weight. The length to diameter (L/D) ratio of the penetrator is 10.6. Two types of MMC plate have been fabricated by a liquid pressing method; A356/45%vol.SiC with a uniform distribution of SiC particle and Al7075/45%vol.B4Cp with B4C particle. The mechanical properties were measured with the high-speed split Hopkinson bar test, hardness test and compression test. The popular Simplified Johnson-Cook model was adopted to represent the material characteristics for FEM simulations. Based on the depth of penetration (DOP) by simulation and high-speed shot test, the performance evaluation of the MMC applied armour system has been made by comparing with the conventional semi-infinite mild steel target. The results show that placing ceramic front layer provides a certain gain in protection, and that placing another ductile front layer provides a further gain. The application of MMC is found to be attractive. Whether SiC or B4C is best deserves more delicate shot tests.