This paper presents the effect of process parameters of the fused deposition modelling (FDM) method on mechanical properties of 3D-printed carbon fibre (CF)-reinforced polylactic acid (PLA) composite. Building direction, infill percentage, and layer height are the process variables considered for studies due to their high influencing factor in mechanical properties of product. Tensile strength and impact strength are the response parameters considered in the study. Multi-optimisation is done using TOPSIS (Technique for Order Preferences by Similarity to Ideal Solution) analysis to find the best set of parameters that would provide the maximum strength using minimum material. The material used is CF-reinforced PLA composite filament (1.75-mm diameter) for 3D printing.
Multiwalled carbon nanotube-enriched epoxy polymers were prepared by solvent evaporation based on a commercially available epoxy system and functionalized multiwalled carbon nanotubes (COOH-MWCNTs). Three weight ratio configurations (0.05, 0.5, and 1.0 wt %) of COOH-MWCNTs were considered and compared with neat epoxy and ethanol-treated epoxy to investigate the effects of nano enrichment and processing. Here, the thermal properties of the epoxy polymers, including curing kinetics, thermal conductivity, and degradation kinetics were studied. Introducing the MWCNTs increased the curing activation energy as revealed by differential scanning calorimetry. The final thermal conductivity of the 0.5 and 1.0 wt % MWCNT-enriched epoxy samples measured by laser flash technique increased by up to 15% compared with the neat material. The activation energy of the degradation process, investigated by thermogravimetric analysis, was found to increase with increasing CNT content, suggesting that the addition of MWCNTs improved the thermal stability of the epoxy polymers.
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