Abstract
Improvement in mechanical properties of natural fiber reinforced polymeric composites remain a key focus of researchers in the recent years. However, few studies have been carried out for the improvement in low velocity impact properties of such composites. In the present article, the results on the effect of weave structure of reinforcing fabric and addition of glass microsphere fillers (GMS) on the drop weight impact properties of Hemp/Green epoxy composite samples are reported for the first time. Hemp woven fabrics having four different weave structures (matt, satin, hybrid weave A and hybrid weave B) were developed in an inhouse lab. Four layered composites containing glass microspheres (0%, 2%, 3.5% and 5% on the weight of resin) were fabricated using vacuum bag molding. Drop weight impact testing was performed at 10 J impact energy, and force-displacement, force-time and energy absorbed-time behaviors were recorded and analyzed. The results were statistically analyzed as well. It was found that both weave design and glass microspheres show a significant effect on impact properties of the developed composites. The composite sample reinforced with satin woven reinforcement exhibited maximum value of impact force, whereas composite samples containing 5% glass microspheres display more resilience and stiffness as compared to other structures.
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