The additive manufacturing of metallic lattices based on triply periodic minimal surfaces (TPMS) has recently received plenty of interest in the field of hard tissue engineering. Although these structures are deemed to present advantages over conventional designs in regard to their biological and compressive mechanical properties, their fatigue life has received little attention.

In the following work, Ti-6Al-4V lattices based on gyroid, diamond and Schwartz primitive unit-cells were tested in quasi-static tension and tension-tension cyclic fatigue. Their resulting elastic and fatigue properties are reported and compared in the context of biomedical applications. Compared to the two others, the Schwartz lattices were found to have the lowest strength for a similar relative density. The Young’s moduli of the three samples however, were of similar magnitude. Basquin’s functions are presented to fit the fatigue S-N curves and these can assist with the fatigue design of lattices with identical unit-cells. Fractography analysis from scanning electron microscopy images revealed that the fatigue crack initiation always occurs at the surface, pointing out the importance of surface treatment in SLM-produced titanium lattices.

最近，基于三重周期性最小表面（TPMS）的金属晶格的增材制造在硬组织工程领域引起了很多兴趣。尽管这些结构在生物学和压缩机械性能方面被认为比常规设计更具优势，但其疲劳寿命却很少受到关注。

在以下工作中，对基于回旋，金刚石和Schwartz原始晶胞的Ti-6Al-4V晶格进行了准静态拉伸和拉伸-拉伸循环疲劳测试。报告了它们产生的弹性和疲劳特性，并在生物医学应用中进行了比较。与其他两个相比，发现Schwartz晶格的强度最低，相对密度也相似。然而，三个样品的杨氏模量具有相似的幅度。提出了Basquin的函数以拟合疲劳SN曲线，这些函数可以帮助对具有相同单位晶格的晶格进行疲劳设计。通过扫描电子显微镜图像进行的断口扫描分析表明，疲劳裂纹萌生总是发生在表面，这表明在SLM生产的钛晶格中进行表面处理的重要性。