Fused Deposition Modelling (FDM) is an additive manufacturing technology that has been utilized in developing numerous components from various material for various application. However, in particular, the properties of PLA embedded with coconut wood are still limited. Coconut wood is well known for its environmentally friendly, biodegradable materials, thermal resistance and corrosion resistance. Therefore, the purpose of this research is to investigate the properties of Coconut wood-PLA at different infill percentage (25%, 50%, 75%) and infill pattern (Rectilinear, honeycomb, grid, concentric and octagram spiral) by using FDM technique. The infill percentage refers to the amount of material in percentage used to print corresponding infill patterns. The specimen is printed according to ASTM D790. After that, the bending test been carried out to investigate the mechanical properties. Two mechanical properties were analyzed which are flexural strength and flexural modulus. After the experiment, the results obtained are then further analyzed by using response surface methodology to determine which parameter gives significant effect to mechanical properties. Mathematical models of the mechanical properties were also introduced using response surface methodology which can be used to predict desired mechanical properties with varying infill percentage and infill pattern. The results show that concentric infill pattern and 75% infill percentage achieved maximum properties in bending testing. The optimum parameters combination is concentric infill pattern with 75% infill percentage. Its optimum mechanical property is 22.666MPa for flexural strength and 0.4823GPa for flexural modulus.
Fused Deposition Modelling (FDM) technology is among the lowest cost 3D printing technology for processing thermoplastic and composite materials. FDM has been highly used in additive manufacturing due to its ability to process complex parts with accurate dimension and lowest cost possible. FDM technology has limited working temperature; hence the materials used in FDM such as polylactic acid (PLA) have a relatively low melting temperature. The drawback of these thermoplastic printed through FDM is the lack of mechanical strength and properties such as thermal and electrical conductivity to print functional part. These problems have led to the development of new composite filament for FDM technique. In this research, polymer-matrix composite (PMC) with 25 wt.% and 80 wt.% of copper reinforced polylactic acid (PLA) specimens have been printed with different infill patterns (Rectilinear, Grid, Concentric, Octagram-spiral, and Honeycomb) to study its flexural properties. The flexural test was carried out according to ASTM D790. This study found that there is a significant effect of the two parameters towards flexural properties. From the flexural test, the preliminary result of flexural strength and flexural modulus were obtained. The flexural strength is 25.98 MPa achieved by the 25 wt.% Cu composition specimens with Concentric infill pattern. The flexural modulus is 0.3306 GPa achieved by the 80 wt.% Cu composition specimens with Concentric infill pattern.
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