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<p>This expression uses fused deposition modelling (FDM) to examine how different process factors affect the final tensile strength of PLA items that are 3D printed. For fabrication, a CREALITY CR10 SMART FDM machine was used, and PLA Pro + filament with a 1.75&#xa0;mm diameter was used. Three distinct infill patterns (hexagonal, triangle, and star) and a range of process variables, such as printing speed (100, 125, 150&#xa0;mm/s) and layer thickness (0.2, 0.25, 0.3&#xa0;mm), were used in the design of the components in accordance with ASTM D638 type-3 requirements. Nine experimental combinations were produced by optimizing these parameters using the Taguchi L9 orthogonal array design. A Universal Tensile Machine (UTM) was used for tensile testing, and the final tensile strengths for every combination were noted. According to the findings, the triangular infill design outperformed the hexagonal and star patterns in terms of tensile strength. Furthermore, it was shown that the best printing speeds for increasing tensile strength were 150&#xa0;mm/s and a layer thickness of 0.25&#xa0;mm. Scanning electron microscopy (SEM) was used to perform morphological study of the broken PLA surfaces, revealing unique fracture patterns connected to the various infill structures. The study comes to the conclusion that the mechanical performance of PLA components is greatly influenced by layer thickness and infill pattern, with the best tensile strength being obtained with the triangle infill pattern and optimal printing conditions. These results provide important information for enhancing the mechanical characteristics of PLA components that are FDM-printed in real-world applications.</p>

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Effect of lattice infill patterns on the structural integrity of 3D printed polylactic acid: a microstructural and mechanical analysis

  • 期刊论文

  • 发表日期：

    2025年9月26日

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  • Debasis Mishra

摘要

This expression uses fused deposition modelling (FDM) to examine how different process factors affect the final tensile strength of PLA items that are 3D printed. For fabrication, a CREALITY CR10 SMART FDM machine was used, and PLA Pro + filament with a 1.75 mm diameter was used. Three distinct infill patterns (hexagonal, triangle, and star) and a range of process variables, such as printing speed (100, 125, 150 mm/s) and layer thickness (0.2, 0.25, 0.3 mm), were used in the design of the components in accordance with ASTM D638 type-3 requirements. Nine experimental combinations were produced by optimizing these parameters using the Taguchi L9 orthogonal array design. A Universal Tensile Machine (UTM) was used for tensile testing, and the final tensile strengths for every combination were noted. According to the findings, the triangular infill design outperformed the hexagonal and star patterns in terms of tensile strength. Furthermore, it was shown that the best printing speeds for increasing tensile strength were 150 mm/s and a layer thickness of 0.25 mm. Scanning electron microscopy (SEM) was used to perform morphological study of the broken PLA surfaces, revealing unique fracture patterns connected to the various infill structures. The study comes to the conclusion that the mechanical performance of PLA components is greatly influenced by layer thickness and infill pattern, with the best tensile strength being obtained with the triangle infill pattern and optimal printing conditions. These results provide important information for enhancing the mechanical characteristics of PLA components that are FDM-printed in real-world applications.