Abstract
In the present work, short carbon fiber reinforced polyamide 6 (CF/PA6) as fused deposition modelling (FDM) feedstock is developed in order to manufacture lightweight honeycomb structure with low cost and enhanced mechanical performance. The effects of processing parameters during FDM printing on mechanical properties and interlayer adhesion are investigated. First, tensile properties of FDM-printed CF/PA6 specimens with three different printing directions are evaluated. It is found that CF/PA6 printed along tensile loading direction exhibits higher tensile properties than the other two printing direction, indicating a strong anisotropy of mechanical properties adjusted by printing orientation. Secondly, build-plate temperature of FDM printer plays an important role in tensile performance of CF/PA6 specimens. With increasing build-plate temperature, an increase in tensile strength of FDM-printed CF/PA6 specimens is obtained. Also, the single lap-shear strength in printed CF/PA6 are improved by using high build-plate temperature, which is probably caused by the reduced voids and enhanced interlayer bonding. Finally, re-entrant honeycomb structures are successfully FDM-printed using fabricated CF/PA6 filaments, exhibiting remarkable energy absorption capacity and good rebound behavior. The present work provides a high-performance composite feedstock for FDM and key relationship between processing behavior and mechanical performance.
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