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Effect of Infill Line Direction on Tensile and Flexural Properties of Poly(Lactic Acid) Samples during 3D Printing

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Abstract

Polymer-based materials are emerging as a promising alternative to traditional materials in the aerospace and automotive industries. The growth of 3D printers utilizing polymer-based materials is rising, transforming them from hobby devices into industrial production equipment. Therefore, understanding the impact of production parameters on the mechanical strength of produced samples has become increasingly critical. This study aimed to evaluate the effect of infill line direction on the mechanical strength of poly(lactic acid) polymer-based samples, which are typically used in 3D printing production. Tensile and bending test samples were performed in six different infill line directions (0°, 45°, 90°, 0°/45°, 0°/90°, and 45°/135°) to investigate their effect on mechanical strength. The results indicate that the filling direction affects the mechanical strength of the parts produced in the 3D printer. In particular, samples produced with the 0° infill direction exhibited the highest tensile and flexural strengths. Microscopic images of the rupture surfaces support the results and show the adhesion and delamination between rasters and layers in different fill directions. Furthermore, the effect of filling direction on mechanical strength was statistically evaluated. The regression analysis supported the experimental findings. In addition, the effect of the filling direction on the flexural strength was found to be more significant and evident than on the tensile strength.

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Acknowledgments

The author thanks Dr. Eser Yarar for his support in developing the regression analysis and Editage (www.editage.com) for English language editing.

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  1. Mechanical Engineering Department, Kocaeli University, Izmit, Kocaeli, Turkey

    Alp Eren Sahin

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Sahin, A.E. Effect of Infill Line Direction on Tensile and Flexural Properties of Poly(Lactic Acid) Samples during 3D Printing. J. of Materi Eng and Perform 33, 1202–1209 (2024). https://doi.org/10.1007/s11665-023-08813-5

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