Effect of 3D Printing Parameters on Mechanical Properties of PETG
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Tan, Miranda Kai
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Abstract
Additive manufacturing is gaining traction because of its cost efficiency, flexibility, in producing non-standard geometric forms, and capabilities for mass production and customization of complex parts without the creation of excessive waste. To effectively use the technology for civil engineering applications, the materials and techniques used must be well characterized in terms of load carrying capability, but there is currently a lack of published data on printer and material-specific properties. The motivation of this research is to characterize the tensile behavior of 3D printing polymer materials using a standard desktop printer. Four different experiments were conducted on PETG to evaluate how individual printing parameters affect the tensile behavior. These printing parameters included size of specimens, infill angle, rate of cooling, and nozzle temperature. Experimental data for size effects shows that width has a greater impact on post-peak behavior than gauge length. In the range of 45º to 0º infill, larger angles are more likely to experience large maximum strains than smaller angles. When multiple specimens are printed together, the cooling time between layers increases. Experimental data for nozzle temperature showed no trend between increasing nozzle temperature and tensile behavior within the temperature ranges considered. These findings provide a better understanding for how several printing parameters affect the tensile properties and behavior of 3D printed PETG, but further investigation into temperature dependence, polymers from different manufacturers, and mechanical properties other than tension is necessary.
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2023-05-02
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