Abstract
This research examines the structural performance of Tough Polylactic Acid (PLA) components made through material extrusion, focusing on tensile and fatigue behaviors. Tough PLA, similar to regular PLA, exhibits improved toughness comparable to acrylonitrile butadiene styrene (ABS). As the application of 3D printed parts for functional use expands, understanding the mechanical attributes of materials under both static and dynamic loading conditions is crucial. This study investigates the impact of infill pattern/density and localized reinforcement on the tensile and fatigue strength of Tough PLA samples. Digital image correlation (DIC) and optical micrographs were used to acquire surface-strain data. The findings highlight the influence of localized reinforcement and infill density. Increased infill density is associated with higher tensile strength and Young’s modulus, with specimens at 90 % infill achieving a tensile strength of 28 MPa and Young’s modulus of 0.46 GPa. Incorporating mesh modifiers can enhance tensile properties by up to 20 %. An Analysis of Variance (ANOVA) confirmed the significant effects of these factors on tensile strength. Fatigue test results show a grid pattern without modifiers exhibits the best fatigue life, with specimens enduring up to forty-two thousand cycles at 45 % UTS, while a line modifier balances fatigue strength and tensile properties.
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