Dynamic fracture behavior of 3D-printed composites reinforced with continuous fibers

This study aims to analyze the influence of continuous fiber reinforcement on the dynamic behavior of 3D-printed composites. To this end, semicircular bending (SCB) test coupons were designed and printed using the fused filament fabrication (FFF) technique. Particularly, nylon material was used as a matrix in all specimens, while fiberglass was utilized as the reinforced material. Since printing orientation has a significant influence on the mechanical behavior of 3D-printed components, the samples were printed in different directions. In a series of tests, the SCB specimens were impacted using a split Hopkinson pressure bar (SHPB) with a strain rate of 100 s-1. In this research, a high-speed photograph system was used with a focus on the SCB specimens to capture their deformation behaviors. The results of dynamic three-point bending tests indicate that the maximum force increased by 190.2% and 238.1% in the specimens printed in ZY and YZ orientations, respectively, as a result of fiber reinforcing. The documented outcomes can be used for the design and production of 3D-printed composites with enhanced structural performance and customized mechanical strength.