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This study investigates the three-point bending behavior of honeycomb sandwich structures with different core topologies (rectilinear, auxetic, and hexagonal) using 3D-printed Polylactic Acid (PLA) and Polyethylene Terephthalate Glycol (PETG) materials. The fused deposition modeling (FDM) is implemented for 3D printing specimens. Tensile tests were conducted to compare the tensile strength, modulus of elasticity and yield strength between PLA and PETG polymers. Then, within 3points bending settings, experimental results highlight the influence of core geometry on the bending performance, with particular focus on stiffness and strength. Comparative analysis of PLA and PETG materials reveals differences in material properties that affect the overall performance of the sandwich structures. The findings provide insights about the impacts of core topology and material selection in optimizing the mechanical properties of honeycomb sandwich composites for various engineering applications.

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*Experimental Investigation of Flexural Strength and Stiffness of Honeycomb-Sandwich Structures Produced by FDM

  • 会议论文

  • 发表日期：

    2025年

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  • Hana Mellouli,
  • Hanen Mallek,
  • Marwa Allouch,
  • Mondher Wali,
  • Fakhreddine Dammak

摘要

This study investigates the three-point bending behavior of honeycomb sandwich structures with different core topologies (rectilinear, auxetic, and hexagonal) using 3D-printed Polylactic Acid (PLA) and Polyethylene Terephthalate Glycol (PETG) materials. The fused deposition modeling (FDM) is implemented for 3D printing specimens. Tensile tests were conducted to compare the tensile strength, modulus of elasticity and yield strength between PLA and PETG polymers. Then, within 3points bending settings, experimental results highlight the influence of core geometry on the bending performance, with particular focus on stiffness and strength. Comparative analysis of PLA and PETG materials reveals differences in material properties that affect the overall performance of the sandwich structures. The findings provide insights about the impacts of core topology and material selection in optimizing the mechanical properties of honeycomb sandwich composites for various engineering applications.