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The Effects of Build Parameters and Strain Rate on the Mechanical Properties of FDM 3D-Printed Acrylonitrile Butadiene Styrene

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Document pages: 27 pages

Abstract: In this paper, the effects of build parameters onthe mechanical properties of 3D-printed acrylonitrile butadiene styrene (ABS)produced using fused deposition modeling (FDM) are investigated. Full factorialexperimental design incorporating a 2-level, 3-factor design with raster angle,layer thickness and interior fill style was carried out. Tensile tests wereperformed at four different strain rates to determine how the build parametersinfluence the mechanical properties of the 3-D printed ABS and to assess itsstrain rate sensitivity under quasi-static loading. It was found that themodulus of toughness of ABS material is most influenced by raster angle, whilethe interior fill style is the most dominant build parameter that dictates thespecimen’s modulus of resilience, yield strength and ultimate tensile strength.At all strain rates, it is further revealed that higher mean values of yieldstrength, ultimate tensile strength and modulus of resilience were obtainedwhen the interior fill style is solid as opposed to high density. This can beattributed to the denser structure and higher effective cross-sectional area insolid interior fill style in comparison with high density interior fill style.However, the influence of the layer thickness on the investigated mechanicalproperties was found to be inconsistent. It was noted that specimens built withboth 0.254 mm layer thickness and the cross [0° 90°] raster angle had superiormechanical properties when compared to those built with the 0.3302 mm layerthickness and cross [0° 90°] raster angle. This suggests that there is a keyinteraction between the layer thickness and the raster angle. At any FDM buildparameter, it was found that all the mechanical properties investigated in thiswork exhibited modest sensitivity to strain rates. This study has provided aplatform for an appropriate selection of build parameters combinations andstrain rates for additive manufacturing of 3D-printed ABS with improvedmechanical properties.

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