Higher strength and lower degradation rate of Fe compared to magnesium and zinc have made it the most reliable for orthopaedic reconstruction. Hence, this paper studies the morphological and mechanical characteristics of porous Fe fabricated using subtractive manufacturing for load bearing bone replacement. Three types of porous Fe (19%, 39% and 59%) were prepared and then modelled into a 3D model for finite element analysis. The mechanical properties evaluated through finite element analysis were then validated by the experimental results. Computational fluid dynamics was done in this study to evaluate the permeability and wall shear stress of the porous Fe. Correlations between morphological indices, mechanical properties, shear stress and permeability were then obtained. The mechanical behaviour of porous Fe investigated through finite element analysis was in good agreement with the experimental work. The mechanical properties of porous Fe specimen particularly sample C (modulus: 5.63 GPa and yield strength: 145.7 MPa) was tailored to the cancellous bone (modulus: 0.5 GPa–18 GPa and yield strength: 101 MPa–169.6 MPa). As the porosity increased, the performance of porous Fe regarding mechanical properties and morphological properties were enhanced.

中文翻译：

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减法制造多孔铁的可控宏观体系，用于松质骨模拟：计算与实验验证

与镁和锌相比，铁具有更高的强度和更低的降解速率，使其成为骨科修复手术中最可靠的方法。因此，本文研究了用减法制造法制造的多孔铁的形态和力学特性，以用于承重骨置换。制备了三种类型的多孔铁（19％，39％和59％），然后将其建模为3D模型以进行有限元分析。然后通过实验结果验证了通过有限元分析评估的机械性能。在这项研究中进行了计算流体动力学，以评估多孔铁的渗透率和壁切应力。然后获得了形态指标，力学性能，剪切应力和渗透率之间的相关性。通过有限元分析研究的多孔铁的力学行为与实验工作吻合良好。多孔铁试样的机械性能，特别是样品C（模量：5.63 GPa，屈服强度：145.7 MPa）适合于松质骨（模量：0.5 GPa–18 GPa，屈服强度：101 MPa–169.6 MPa）。随着孔隙率的增加，多孔铁在力学性能和形态学性能方面的性能得到增强。