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<p>This study investigates the mechanical behavior and energy absorption characteristics of Modified Periodic Lattice Structures (MPLS), a class of mechanical metamaterials fabricated through Fused Deposition Modeling (FDM) using PLA+. Five lattice samples with varying strut-hole diameters (MPLS-0, MPLS-5, MPLS-10, MPLS-15, and MPLS-20) were designed and subjected to uniaxial compression tests in accordance with ISO 13,314 standards. The impact of strut perforation on key mechanical metrics—including strength, energy absorption density (EAD), specific energy absorption (SEA), and efficiency of energy absorption (EAE)—was evaluated through both experimental testing and finite element (FE) simulations using Abaqus. The results revealed a clear trade-off between perforation size and mechanical integrity: MPLS-0 (solid struts) achieved the highest yield strength (13.61&#xa0;MPa), EAD (13.26&#xa0;J/cm³), and SEA (2.41&#xa0;J/g), whereas MPLS-20 (largest perforations) dropped to 6.90&#xa0;MPa, 6.04&#xa0;J/cm³, and 1.15&#xa0;J/g, respectively. Intermediate designs provided balanced outcomes: MPLS-5 and MPLS-10 preserved 83–75% of the solid strut strength while offering up to ~ 10% weight savings. FE simulations confirmed these findings and highlighted localized stress concentrations and torsional effects in hollow-strut lattices, especially in MPLS-15 and MPLS-20. Interestingly, higher-porosity lattices exhibited prolonged deformation before densification, suggesting potential advantages for energy dissipation and composite reinforcement despite reduced strength. Overall, moderate perforation (MPLS-5 and MPLS-10) offered an effective compromise between mass reduction and mechanical performance, emphasizing the role of controlled geometry in designing lightweight, impact-resistant components for aerospace, automotive, and protective systems.</p>

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Effect of strurt shape mechanical and absorption performance of periodic lattices

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月25日

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  • Sepideh Bayat,
  • Ahmadreza Farjood,
  • Zahra-Sadat Seyedraoufi

摘要

This study investigates the mechanical behavior and energy absorption characteristics of Modified Periodic Lattice Structures (MPLS), a class of mechanical metamaterials fabricated through Fused Deposition Modeling (FDM) using PLA+. Five lattice samples with varying strut-hole diameters (MPLS-0, MPLS-5, MPLS-10, MPLS-15, and MPLS-20) were designed and subjected to uniaxial compression tests in accordance with ISO 13,314 standards. The impact of strut perforation on key mechanical metrics—including strength, energy absorption density (EAD), specific energy absorption (SEA), and efficiency of energy absorption (EAE)—was evaluated through both experimental testing and finite element (FE) simulations using Abaqus. The results revealed a clear trade-off between perforation size and mechanical integrity: MPLS-0 (solid struts) achieved the highest yield strength (13.61 MPa), EAD (13.26 J/cm³), and SEA (2.41 J/g), whereas MPLS-20 (largest perforations) dropped to 6.90 MPa, 6.04 J/cm³, and 1.15 J/g, respectively. Intermediate designs provided balanced outcomes: MPLS-5 and MPLS-10 preserved 83–75% of the solid strut strength while offering up to ~ 10% weight savings. FE simulations confirmed these findings and highlighted localized stress concentrations and torsional effects in hollow-strut lattices, especially in MPLS-15 and MPLS-20. Interestingly, higher-porosity lattices exhibited prolonged deformation before densification, suggesting potential advantages for energy dissipation and composite reinforcement despite reduced strength. Overall, moderate perforation (MPLS-5 and MPLS-10) offered an effective compromise between mass reduction and mechanical performance, emphasizing the role of controlled geometry in designing lightweight, impact-resistant components for aerospace, automotive, and protective systems.