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<p>Additive manufacturing (AM) technique is a promising methodology for fabricating high-performance structural components with excellent integrity. In this study, the AlSi10Mg alloy gyroid lattice core sandwich beams were manufactured through selective laser melting (SLM) method and followed with heat treatment. The soft impact response of the gyroid lattice core sandwich beams has been investigated and compared with those of the monolithic mild steel and traditionally manufactured foam core sandwich beams. The study indicates that the beams fabricated by the SLM methodology possess superior bonding strength at the face sheet/core, which directly enhances their integral stiffness. This resulted in a reduction of the back-face deflection by over 85% compared to conventional foam core sandwich beams, while also preventing local damage. Furthermore, this integrity significantly altered the impact energy allocation, converting more kinetic energy into the strain energy of the projectile rather than structural absorption. The unique energy partition mechanism, enabled by the high bonding strength and high-strength gyroid lattice core, effectively enhances the impact resistance while achieving minimal deformation.</p>

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Soft Impact Response of Additively Manufactured Gyroid Lattice Core-Based Sandwich Beams with High Face-Core Bonding Strength

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Jia Liu,
  • Yuwu Zhang,
  • Yuyan Zhang,
  • Yao Tan,
  • Xiangcheng Li,
  • Yuliang Lin,
  • Minzu Liang,
  • Rong Chen

摘要

Additive manufacturing (AM) technique is a promising methodology for fabricating high-performance structural components with excellent integrity. In this study, the AlSi10Mg alloy gyroid lattice core sandwich beams were manufactured through selective laser melting (SLM) method and followed with heat treatment. The soft impact response of the gyroid lattice core sandwich beams has been investigated and compared with those of the monolithic mild steel and traditionally manufactured foam core sandwich beams. The study indicates that the beams fabricated by the SLM methodology possess superior bonding strength at the face sheet/core, which directly enhances their integral stiffness. This resulted in a reduction of the back-face deflection by over 85% compared to conventional foam core sandwich beams, while also preventing local damage. Furthermore, this integrity significantly altered the impact energy allocation, converting more kinetic energy into the strain energy of the projectile rather than structural absorption. The unique energy partition mechanism, enabled by the high bonding strength and high-strength gyroid lattice core, effectively enhances the impact resistance while achieving minimal deformation.