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<p>Wood-based Poly-Lactic Acid (PLA) filaments are increasingly used in additive manufacturing due to their biodegradable and sustainable properties, offering eco-friendly alternatives to petroleum-based polymers. Although their mechanical behavior has been studied, limited focus has been placed on fracture toughness. This research investigates fracture behavior and surface roughness of 3D-printed wood PLA specimens using three infill patterns (hexagonal, cubic, gyroid) and three printing speeds (60, 70, 80&#xa0;mm/s). Compact tension specimens were tested per ASTM E1922 standards. Results show the hexagonal infill provides the highest fracture toughness, improving by 10.4% and 11.7% over gyroid and cubic patterns. Specimens printed at 60&#xa0;mm/s achieved 11.7% and 20.2% higher toughness than those at 70 and 80&#xa0;mm/s. A pattern-dependent effect was observed: hexagonal strength decreased with speed, while cubic and gyroid showed little variation. Surface roughness and microscopy confirmed that higher toughness correlates with stronger interlayer bonding, whereas void formation reduced toughness.</p>

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Influence of Infill Patterns and Printing Speed on Fracture Behaviour of Wood PLA 3D-Printed Specimens

  • 期刊论文

  • 发表日期：

    2025年10月21日

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  • B. Shenbagapandiyan,
  • D. Abraham Anthony,
  • N. Venkateshwaran,
  • K. Vigneshwaran,
  • E. Shankar

摘要

Wood-based Poly-Lactic Acid (PLA) filaments are increasingly used in additive manufacturing due to their biodegradable and sustainable properties, offering eco-friendly alternatives to petroleum-based polymers. Although their mechanical behavior has been studied, limited focus has been placed on fracture toughness. This research investigates fracture behavior and surface roughness of 3D-printed wood PLA specimens using three infill patterns (hexagonal, cubic, gyroid) and three printing speeds (60, 70, 80 mm/s). Compact tension specimens were tested per ASTM E1922 standards. Results show the hexagonal infill provides the highest fracture toughness, improving by 10.4% and 11.7% over gyroid and cubic patterns. Specimens printed at 60 mm/s achieved 11.7% and 20.2% higher toughness than those at 70 and 80 mm/s. A pattern-dependent effect was observed: hexagonal strength decreased with speed, while cubic and gyroid showed little variation. Surface roughness and microscopy confirmed that higher toughness correlates with stronger interlayer bonding, whereas void formation reduced toughness.