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<p>This study investigates the enhancement of mechanical performance in polylactic acid (PLA) components fabricated using fused deposition modeling (FDM) through the application of a zinc coating via the electric arc thermal spray process. Three major parameters of FDM processing such as infill density (60, 80 and 100 percent), printing speed (20, 40 and 60&#xa0;mm/s) and the infill pattern (linear, triangular and hexagonal) were systematically studied on tensile and flexural strengths of the coated PLA specimens. Moreover, the experimental design was optimized by means of Taguchi L9 orthogonal array and mechanical properties (tensile and flexural strength) were determined with the help of a universal testing machine (UTM). The findings indicate that tensile and flexural behaviors are controlled by unique optimum combinations of the parameters. The highest tensile strength of 53.44&#xa0;MPa was achieved at 100 percent infill density, a print speed of 40&#xa0;mm/s and triangular infill pattern. However, the highest flexural strength of 146.6&#xa0;MPa was achieved at 100 percent infill density, a print speed of 20&#xa0;mm/s and hexagonal infill pattern. These results reveal that incorporating FDM with electric arc thermal spray coating could provide a promising path to boosting dramatically the mechanical performance of 3D-printed PLA components to expand their scope of use in high-end engineering disciplines.</p>

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Investigation of Tensile and Flexural Properties of Zinc-Coated Polylactic Acid Parts

  • 期刊论文

  • 发表日期：

    2026年5月3日

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  • Swarn Singh,
  • Santosh Kumar,
  • Mamta Dahiya,
  • Virat Khanna

摘要

This study investigates the enhancement of mechanical performance in polylactic acid (PLA) components fabricated using fused deposition modeling (FDM) through the application of a zinc coating via the electric arc thermal spray process. Three major parameters of FDM processing such as infill density (60, 80 and 100 percent), printing speed (20, 40 and 60 mm/s) and the infill pattern (linear, triangular and hexagonal) were systematically studied on tensile and flexural strengths of the coated PLA specimens. Moreover, the experimental design was optimized by means of Taguchi L9 orthogonal array and mechanical properties (tensile and flexural strength) were determined with the help of a universal testing machine (UTM). The findings indicate that tensile and flexural behaviors are controlled by unique optimum combinations of the parameters. The highest tensile strength of 53.44 MPa was achieved at 100 percent infill density, a print speed of 40 mm/s and triangular infill pattern. However, the highest flexural strength of 146.6 MPa was achieved at 100 percent infill density, a print speed of 20 mm/s and hexagonal infill pattern. These results reveal that incorporating FDM with electric arc thermal spray coating could provide a promising path to boosting dramatically the mechanical performance of 3D-printed PLA components to expand their scope of use in high-end engineering disciplines.