El documento adjunto trata del desarrollo de materiales compuestos de blindaje, económicamente factibles, que combinen protección contra impactos balísticos de alta velocidad y blindaje contra interferencias electromagnéticas (EMI) mediante absorción. Algunos de los paneles desarrollados resisten con éxito impactos de alta velocidad, deteniendo la penetración de balas y manteniendo la integridad estructural, mientras que las mediciones de EMI muestran una absortividad superior al 65 % para todos los paneles. Uno de los nuevos compuestos de epoxi y fibra de vidrio multifuncional, se ha mostrado rentable y desarrolla una protección balística superior en comparación con Kevlar al mismo tiempo que demuestra una alta absorción de blindaje EMI y es prometedor para aplicaciones militares y de defensa.
Abstract
The primary goal of this study is to develop cost-effective shield materials that offer effective protection against high-velocity ballistic impact and electromagnetic interference (EMI) shielding through absorption. Six fiber-reinforced epoxy composite panels, each with a different fabric material and stacking sequence, have been fabricated using a hand-layup vacuum bagging process. Two panels made of Kevlar and glass fibers, referred to as (K-NIJ) and (G-NIJ), have been tested according to the National Institute of Justice ballistic resistance protective materials test NIJ 0108.01 Standard-Level IIIA (9 mm × 19 mm FMJ 124 g) test. Three panels, namely, a hybrid of Kevlar and glass (H–S), glass with ceramic particles (C–S), and glass with recycled rubber (R–S) have been impacted by the bullet at the center, while the fourth panel made of glass fiber (G-S) has been impacted at the side. EMI shielding properties have been measured in the X-band frequency range via the reflection-transmission method. Results indicate that four panels (K-NIJ, G-NIJ, H–S, and G-S) are capable of withstanding high-velocity impact by stopping the bullet from penetrating through the panels while maintaining their structural integrity. However, under such conditions, these panels may experience localized delamination with variable severity. The EMI measurements reveal that the highest absorptivity observed is 88% for the K-NIJ panel at 10.8 GHz, while all panels maintain an average absorptivity above 65%. All panels act as a lossy medium with a peak absorptivity at different frequencies, with K-NIJ and H–S demonstrating the highest absorptivity. In summary, the study results in the development of a novel, cost-effective, multifunctional glass fiber epoxy composite that combines ballistic and electromagnetic interference shielding properties. The material has been developed using a simple manufacturing method and exhibits remarkable ballistic protection that outperforms Kevlar in terms of shielding efficiency; no bullet penetration or back face signature is observed, and it also demonstrates high EMI shielding absorption. Overall, the materials developed show great promise for various applications, including the military and defense.
Fuente: https://www.sciencedirect.com
