Abstract
As a type of environmentally-friendly and low-cost natural material, bamboo fibers exhibit excellent mechanical properties. In this study, a bamboo fiber reinforced polybenzoxazine composite was fabricated by an improved hot-pressing process. The dynamic compressive behaviors of neat benzoxazine and its composite were comparatively studied by an SHPB (split Hopkinson pressure bar) apparatus. SHPB tests showed that the benzoxazine matrix and its composite exhibited significantly positive strain rate sensitivity at nominal strain rates in the range of 0.006–2500/s. During the impact loadings, the progressive deformation and failure of neat benzoxazine and bamboo composite were investigated by capturing real-time images with a high-speed camera. In comparison with neat benzoxazine, the bamboo composite had slightly higher maximum compressive stress under the same strain rates. It is noteworthy that the crashworthiness of the composite was remarkably better than that of neat benzoxazine due to the incorporation of bamboo fibers. For example, the energy absorption of bamboo composite was 105.7% higher than that of neat benzoxazine at a strain rate of 2500/s. The dynamic compressive properties of benzoxazine resin were much better than most of the conventional thermosetting resins. These results could guide the future application of this kind of composites.
Highlights
In the past few decades, natural plant fibers have been widely used as reinforcements in both thermosetting and thermoplastic resins [1,2,3]
Neat benzoxazine and alkali-treated chopped bamboo fiber reinforced composite were prepared by a developed hot-pressing method
The quasistatic and dynamic compressive polybenzoxazine composite were prepared by a developed hot-pressing method
Summary
In the past few decades, natural plant fibers have been widely used as reinforcements in both thermosetting and thermoplastic resins [1,2,3]. Important studies have claimed that natural fibers, such as hemp, banana, flax, jute, sisal, and bamboo, demonstrated great potentials for replacing synthetic fibers (glass, aramid, carbon, etc.) [4,5] On one hand, these natural fibers/polymer composites exhibit good mechanical performance. Some works about the dynamic mechanical properties of natural fiber/polymer composites have been reported, the information on the dynamic compressive behaviors of short bamboo fiber/polymer composites is very limited. To bridge this gap, the compressive behaviors of short bamboo fiber reinforced polybenzoxazine composite at different strain rates were investigated by the SHPB system in this study. This work could provide insights that can expand the utilization of this kind of SFRPCs in the field of dynamic impact engineering
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