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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Effect of the topology on the mechanical properties of porous iron immersed in body fluids
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Effect of the topology on the mechanical properties of porous iron immersed in body fluids

机译：拓扑对浸入体液中多孔铁的力学性能的影响

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摘要

A new generation of biodegradable metal alloys with a porous structure has been receiving growing attention as temporary bone scaffolds for tissue regeneration. The mechanical response of the scaffolds depends upon several factors including the properties of the metal itself, the amount of porosity, the geometrical topology and the immersion conditions. The purpose of this study is to evaluate the degradation behaviour and the mechanical properties of porous iron samples with porosities in the range of 20-30%. Besides the amount of porosity, the effect of topology was evaluated with the study of different arrangement of pores, as well as pore shapes. The specimens were subjected to chemical degradation by immersion of the iron samples in body fluid simulation conditions. The mechanical properties of the samples prior and after the degradation process were assessed by three-point bending tests. Numerical simulations were carried out and the results were compared with the experimental results. The degradation operated by body fluids tends to reduce the mechanical properties. In comparison with the compact structures, porous structures exhibit lower mechanical strength, but still with reasonable values for the use in temporary implants, which also allows reducing the stress shielding effect, keeping the biodegradable advantages. The present work also confirms that the topological design has a strong influence on the mechanical properties of the specimens and on the biodegradation behaviour.
机译：新一代具有多孔结构的可生物降解的金属合金一直受到临时骨支架的关注，用于组织再生。支架的机械响应取决于包括金属本身的性质，孔隙率，几何拓扑和浸渍条件的若干因素。本研究的目的是评估多孔铁样品的降解行为和孔隙率范围内的多孔铁样品的机械性能。除了孔隙率的量，还通过对不同布置的孔隙以及孔形状进行了评价拓扑的影响。通过浸入体液模拟条件下的铁样品进行化学降解。通过三点弯曲试验评估在降解过程之前和之后样品的机械性能。进行数值模拟，并将结果与​​实验结果进行比较。由体液操作的降解趋于降低机械性能。与紧凑的结构相比，多孔结构表现出较低的机械强度，但仍然具有用于临时植入物的合理值，这也允许降低应力屏蔽效果，保持可生物降解的优点。目前的工作还证实了拓扑设计对样品的机械性能和生物降解行为具有很大的影响。

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