Design of shock wave attenuation effects on multi-impedance-matched laminated composites

To improve the protective performance of composite armor materials, three types of laminated composites with different arrangements were designed by the principle of impedance matching. The impedance combination schemes used in this work were high impedance→low impedance (type I), low impedance→high impedance (type II), and high and low impedance (type III). The microstructures and properties of the test samples prepared in a vacuum hot-pressing furnace were investigated by micro-indentation and dynamic impact experiments. According to the propagation theory of one-dimensional elastic waves in multilayered media, the propagation law of shock waves in the as-prepared laminated composites was examined. Micro-indentation test results revealed that the hardness of the Fe2Al5 intermetallic compound formed by the reaction of Al and 304 SS was the highest and ranged from 917.5 HV to 1026.3 HV. The type II layered composite had the highest compressive strength (1139 MPa) followed by the type I composite and the type III composite. The type III composite manifested the highest energy absorption efficiency (73%) followed by the type II layered composite and the type I composite.