Scholarlink

<p>Conventional metallic bone plates commonly lead to stiffness mismatches which delay natural bone remodelling and induce stress shielding in the bone tissue. To overcome these limitations, this study develops SS316L missing-rib auxetic lattices through laser powder bed fusion to mimic bone-like mechanical properties and improve implant performance. SS316L missing-rib auxetic lattices with varying relative densities of 40%, 50%, and 60% were fabricated, and their mechanical and morphological responses were evaluated. Microstructure and fracture features were examined using a field emission scanning electron microscopy combined with energy dispersive spectroscopy analysis. Under tensile and compressive loading, the 60% relative density lattice reached strengths of 172.96&#xa0;MPa and 144.28&#xa0;MPa, respectively. Compared to fully dense SS316L, the auxetic structures exhibited 70% and 75% lower stiffness, which effectively reduces stress shielding while preserving bone-like strength. Fractographic observations and deformation analysis revealed distinct density-dependent deformation mechanisms, highlighting the significance of lattice geometry in governing strain redistribution and crack propagation. Poisson's ratio measurement confirmed excellent auxetic behaviour in both tension and compression with values nearing −&#xa0;1.0 across all relative density lattice samples compared to + 0.75429 and + 0.66492 obtained for the fully dense coupons. These dual-mode deformation responses maximize load distribution and promote better conformity at the implant–bone interface. This study integrates lattice fabrication, microstructural characterization, and mechanical behaviour evaluation, establishing the missing-rib lattice as a promising design for fracture fixation plates with strong biomechanical compatibility and clinical relevance.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Influence of Relative Density on the Microstructure and Mechanical Properties of SS316L Additively Manufactured Auxetic Structures

  • 期刊论文

  • 发表日期：

    2026年4月10日

查看全文
  • Sakthi Sadhasivam Raman,
  • Muthukannan Duraiselvam

摘要

Conventional metallic bone plates commonly lead to stiffness mismatches which delay natural bone remodelling and induce stress shielding in the bone tissue. To overcome these limitations, this study develops SS316L missing-rib auxetic lattices through laser powder bed fusion to mimic bone-like mechanical properties and improve implant performance. SS316L missing-rib auxetic lattices with varying relative densities of 40%, 50%, and 60% were fabricated, and their mechanical and morphological responses were evaluated. Microstructure and fracture features were examined using a field emission scanning electron microscopy combined with energy dispersive spectroscopy analysis. Under tensile and compressive loading, the 60% relative density lattice reached strengths of 172.96 MPa and 144.28 MPa, respectively. Compared to fully dense SS316L, the auxetic structures exhibited 70% and 75% lower stiffness, which effectively reduces stress shielding while preserving bone-like strength. Fractographic observations and deformation analysis revealed distinct density-dependent deformation mechanisms, highlighting the significance of lattice geometry in governing strain redistribution and crack propagation. Poisson's ratio measurement confirmed excellent auxetic behaviour in both tension and compression with values nearing − 1.0 across all relative density lattice samples compared to + 0.75429 and + 0.66492 obtained for the fully dense coupons. These dual-mode deformation responses maximize load distribution and promote better conformity at the implant–bone interface. This study integrates lattice fabrication, microstructural characterization, and mechanical behaviour evaluation, establishing the missing-rib lattice as a promising design for fracture fixation plates with strong biomechanical compatibility and clinical relevance.