The influence of process parameters on mechanical properties of fused deposition modeling parts

Tang, Mei Shick (2017) The influence of process parameters on mechanical properties of fused deposition modeling parts. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Fused deposition modeling (FDM) is one of additive manufacturing process which used heated plastic materials such as acrylonitrile-butadiene-styrene (ABS) from the nozzle to produce parts layer by layer from bottom to top. FDM parts were brittle because of the high porosity which cause by the trapped air bubbles when models were built. The aim of this project is to study the influence of different types of process parameters on mechanical properties of FDM parts. Process parameters used in this project are infill pattern, infill percentage and layer thickness. In addition the interactions between process parameters were investigated. Three levels of each parameters were used in this project; infill pattern of line, concentric, and honeycomb; infill percentage of 10%, 30% and 50%; layer thickness of 0.2 mm, 0.3 mm and 0.4 mm. The mechanical properties used for testing were tensile and three-point flexural test. There are 27 experimental runs for each responses that were arranged using design of experiment (DOE) method. For the tensile, infill pattern of concentric, infill percentage of 50% and layer thickness of 0.2 mm shows the highest mechanical strength of 31.22 MPa. Compare with flexural, the result were mostly same but infill pattern of honeycomb and the flexural strength is 26.66 MPa. This is due to the different testing method to cause the specimens to break. Analysis of Variance (ANOVA) of Minitab 2017 is used to find which parameters or the interaction are significant. Main effect plot and interaction plot were also plotted to find the optimization result for both responses. The outcomes showed all the parameters including the combination of the parameters were statistically significant.

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