Additive manufacturing (AM) is revolutionizing the design and fabrication of orthopedic implants, enabling the creation of complex graded structures to enhance biomechanical bionics. This study aims to enhance fatigue life and reduce stress shielding for a long-term stability by using functionally graded lattice. Various lattice with minimal surface, including uniform array, axis graded, and dual-graded Gyroid, were designed and fabricated by selective laser melting (SLM), followed by mechanical and fatigue tests for validation of design objectives. With a novel Sigmoid-Boltzmann fusion algorithm, the dual-graded lattice enhances the artificial vertebral body (AVB) with an 11 % increase in strength, >200 % improvement in fatigue life and reduced stress shielding on the contact surface, benefiting long-term implant stability and biomechanical fidelity. It displayed outstanding resistance to fatigue crack propagation due to superior load-bearing capacity and energy absorption capabilities contributed by the graded central region. The findings highlight the significance of biomimetic design principles and offer insights into the optimization of orthopedic implants using dual-graded lattice.

中文翻译：

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具有机械仿生学的双梯度晶格，可增强疲劳性能


增材制造 (AM) 正在彻底改变骨科植入物的设计和制造，能够创建复杂的分级结构以增强生物力学仿生学。本研究旨在通过使用功能梯度晶格来提高疲劳寿命并减少应力屏蔽以实现长期稳定性。通过选择性激光熔化（SLM）设计和制造了各种具有最小表面的晶格，包括均匀阵列、轴分级和双分级陀螺仪，然后进行机械和疲劳测试以验证设计目标。采用新颖的 Sigmoid-Boltzmann 融合算法，双梯度晶格增强了人工椎体 (AVB)，强度提高了 11%，疲劳寿命提高了 200% 以上，接触面应力屏蔽减少，长期受益种植体稳定性和生物力学保真度。由于分级中心区域提供的卓越承载能力和能量吸收能力，它表现出出色的抗疲劳裂纹扩展能力。研究结果强调了仿生设计原理的重要性，并为使用双梯度晶格优化骨科植入物提供了见解。