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<p>Reentrant hexagonal (RH) auxetic structures are attractive due to high flexibility and the ability to tailor load paths through controlled support orientation. These RH auxetic structures are fabricated through additive manufacturing techniques without losing their structural properties. In this research work, a novel reentrant hexagonal (RH) auxetic lattice structure was designed to provide a lightweight AlSi10Mg structures for the automotive application and fabricated using laser powder bed fusion (LPBF). The microstructural characteristics of the RH auxetic fabricated AlSi10Mg alloy were analyzed using the optical microscope (OM) and electron backscatter diffraction (EBSD). Also, the mechanical properties of the RH fabricated structures were evaluated through both experimental and finite elemental analysis methods. The RH lattice-structured sample exhibits a tensile strength of 138.1&#xa0;MPa with an elongation at break of 11.5%. Tensile fractography obtained through SEM analysis reveals the presence of dimples in the tensile load applied areas and provides the crack propagations during the elongation. The fabricated structures can withstand the three-point bending load of 68.8&#xa0;MPa. The FEA simulations accurately predicted the stress distribution and progressive collapse mechanisms specific to the auxetic architecture. Based on the calculated results, high strength, elasticity, and energy absorption capabilities indicated their suitability in the lightweight applications. The created reentrant hexagonal auxetic lattice structure exhibits outstanding promise for lightweight energy-absorbing uses in aerospace, automobile, and other structural systems that can withstand damage.</p>

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Mechanical Performance and Finite Element Analysis of Reentrant Hexagonal Auxetic Structure of Additively Manufactured AlSi10Mg alloy for Lightweight Application

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • J. Arun Prakash,
  • S. Rathinavel,
  • S. Senthil Kumar,
  • T. S. Senthilkumar

摘要

Reentrant hexagonal (RH) auxetic structures are attractive due to high flexibility and the ability to tailor load paths through controlled support orientation. These RH auxetic structures are fabricated through additive manufacturing techniques without losing their structural properties. In this research work, a novel reentrant hexagonal (RH) auxetic lattice structure was designed to provide a lightweight AlSi10Mg structures for the automotive application and fabricated using laser powder bed fusion (LPBF). The microstructural characteristics of the RH auxetic fabricated AlSi10Mg alloy were analyzed using the optical microscope (OM) and electron backscatter diffraction (EBSD). Also, the mechanical properties of the RH fabricated structures were evaluated through both experimental and finite elemental analysis methods. The RH lattice-structured sample exhibits a tensile strength of 138.1 MPa with an elongation at break of 11.5%. Tensile fractography obtained through SEM analysis reveals the presence of dimples in the tensile load applied areas and provides the crack propagations during the elongation. The fabricated structures can withstand the three-point bending load of 68.8 MPa. The FEA simulations accurately predicted the stress distribution and progressive collapse mechanisms specific to the auxetic architecture. Based on the calculated results, high strength, elasticity, and energy absorption capabilities indicated their suitability in the lightweight applications. The created reentrant hexagonal auxetic lattice structure exhibits outstanding promise for lightweight energy-absorbing uses in aerospace, automobile, and other structural systems that can withstand damage.