High-velocity impact behavior of hybrid fiber-reinforced epoxy composites

Abstract In this study, non-hybrid and hybrid (Kevlar, carbon glass) fabric epoxy composite laminates were fabricated with different stacking sequences by hand lay-up followed hot-compression molding. Experimental tests conducted to investigate tensile, flexural, hardness characteristics. It was found that the sequence did not significantly affect tensile strength values of composites; however, it affected their flexural strength. Damage morphology specimens through SEM images showed major damage mechanisms in composites delamination, fiber breakage, pull-out, matrix cracking. Based on static experimental results, high-velocity impact behavior investigated simulation study using LS-DYNA finite element analysis (FEA) software. To ballistic impact, a steel projectile hemispherical penetrating edge at velocities 100 m.s −1 , 250 350 considered. Among specimens, Kevlar/epoxy specimen have highest energy absorption carbon/epoxy glass/epoxy, respectively. Regarding ones Kevlar plies rear face exhibited better compared other sequences. The glass/epoxy had lowest post-impact residual velocity among all specimens. From FEA noted resistance improved when placed layer. Thus, observed be substantial importance development fabric-reinforced for applications.