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<p>To mitigate stress shielding and enhance the long-term stability of orthopaedic implants, the mechanical and fatigue behaviour of porous titanium scaffolds with a rhombic dodecahedral architecture were systematically investigated. Ti-6Al-4&#xa0;V lattices were additively manufactured by selective laser melting (SLM) and characterized through quasi-static compression and high-cycle fatigue testing. Complementary finite element (FE) analyses were performed in LS-DYNA (Livermore Software Technology Corporation) to elucidate the relationships among porosity, elastic properties, and cyclic damage accumulation. As porosity increased from 70 to 85%, both elastic modulus (0.8–5.4 GPa) and yield strength (23–81&#xa0;MPa) decreased, whereas the densification strain rose from 51 to 66.7%. A scaffold with 75% porosity exhibited an elastic modulus of 3.01 GPa—well within the physiological range of cortical bone (3–30 GPa)—and a fatigue strength of 30&#xa0;MPa, indicating suitability for long-term in vivo application. These findings provide a quantitative framework for tailoring patient-specific porous titanium alloy scaffolds that balance load-bearing capability with biological compatibility.</p>

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Mechanics and Long-Term Stability of Porous Titanium Scaffolds with Rhombic Dodecahedrons

  • 期刊论文

  • 发表日期：

    2025年9月25日

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  • Shihao Bi,
  • Fuyou Wang,
  • Lei Fu,
  • Shuai Ma,
  • Zhengguo Wang,
  • Qian Zhang

摘要

To mitigate stress shielding and enhance the long-term stability of orthopaedic implants, the mechanical and fatigue behaviour of porous titanium scaffolds with a rhombic dodecahedral architecture were systematically investigated. Ti-6Al-4 V lattices were additively manufactured by selective laser melting (SLM) and characterized through quasi-static compression and high-cycle fatigue testing. Complementary finite element (FE) analyses were performed in LS-DYNA (Livermore Software Technology Corporation) to elucidate the relationships among porosity, elastic properties, and cyclic damage accumulation. As porosity increased from 70 to 85%, both elastic modulus (0.8–5.4 GPa) and yield strength (23–81 MPa) decreased, whereas the densification strain rose from 51 to 66.7%. A scaffold with 75% porosity exhibited an elastic modulus of 3.01 GPa—well within the physiological range of cortical bone (3–30 GPa)—and a fatigue strength of 30 MPa, indicating suitability for long-term in vivo application. These findings provide a quantitative framework for tailoring patient-specific porous titanium alloy scaffolds that balance load-bearing capability with biological compatibility.