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<p>Integration of dissimilar materials into a bi-material structure offers an avenue for tailoring mechanical properties beyond the capabilities of individual constituents. This study presents a novel additively manufactured bi-material structure composed of wood-reinforced poly-lactic acid (PLA) (M-1) and carbon-reinforced PLA (M-2), fabricated through an alternating deposition strategy using fused deposition modeling. Research uniquely correlates Mode I fracture toughness between experimental single edge notched bend testing and simulation via extended finite element method, a combination scarcely reported for polymer-based bi-materials. This innovative material demonstrates a significantly improved fracture toughness (<i>K</i><sub>IC</sub> = 7.47&#xa0;MPa√m) over its individual counterparts M-1 (3.25&#xa0;MPa√m) and M-2 (5.14&#xa0;MPa√m). This enhancement emphasizes potential of strategically engineered bi-materials for applications demanding superior crack resistance and structural integrity. The study contributes original insights into the fracture mechanics of multi-material polymer composites fabricated via additive manufacturing.</p>

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Innovative Material Fabricated by Additive Manufacturing: Fracture Toughness Correlation through Experiment and Simulation

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Dhinakaran Veeman,
  • Pechimuthu Arumugaperumal,
  • Sanjay Kannan,
  • Mohan Kumar Subramaniyan

摘要

Integration of dissimilar materials into a bi-material structure offers an avenue for tailoring mechanical properties beyond the capabilities of individual constituents. This study presents a novel additively manufactured bi-material structure composed of wood-reinforced poly-lactic acid (PLA) (M-1) and carbon-reinforced PLA (M-2), fabricated through an alternating deposition strategy using fused deposition modeling. Research uniquely correlates Mode I fracture toughness between experimental single edge notched bend testing and simulation via extended finite element method, a combination scarcely reported for polymer-based bi-materials. This innovative material demonstrates a significantly improved fracture toughness (KIC = 7.47 MPa√m) over its individual counterparts M-1 (3.25 MPa√m) and M-2 (5.14 MPa√m). This enhancement emphasizes potential of strategically engineered bi-materials for applications demanding superior crack resistance and structural integrity. The study contributes original insights into the fracture mechanics of multi-material polymer composites fabricated via additive manufacturing.