LaBPS/ENIM, 1 route d'Ars Laquenexy-CS 65820, 57078 Metz Cedex, France.
J Mech Behav Biomed Mater. 2012 May;9:34-44. doi: 10.1016/j.jmbbm.2012.01.008. Epub 2012 Jan 25.
Commercially Pure Porous Titanium (CPPTi) can be used for surgical implants to avoid the stress shielding effect due to the mismatch between the mechanical properties of titanium and bone. Most researchers in this area deal with randomly distributed pores or simple architectures in titanium alloys. The control of porosity, pore size and distribution is necessary to obtain implants with mechanical properties close to those of bone and to ensure their osseointegration. The aim of the present work was therefore to develop and characterize such a specific porous structure. First of all, the properties of titanium made by Selective Laser Melting (SLM) were characterized through experimental testing on bulk specimens. An elementary pattern of the porous structure was then designed to mimic the orthotropic properties of the human bone following several mechanical and geometrical criteria. Finite Element Analysis (FEA) was used to optimize the pattern. A porosity of 53% and pore sizes in the range of 860 to 1500 μm were finally adopted. Tensile tests on porous samples were then carried out to validate the properties obtained numerically and identify the failure modes of the samples. Finally, FE elastoplastic analyses were performed on the porous samples in order to propose a failure criterion for the design of porous substitutes.
商用纯钛多孔材料（CPPTi）可用于外科植入物，以避免因钛和骨骼的机械性能不匹配而产生的应力屏蔽效应。该领域的大多数研究人员处理的是钛合金中随机分布的孔隙或简单结构。为了获得机械性能接近骨骼的植入物，并确保其骨整合，必须控制孔隙率、孔径和分布。因此，本工作的目的是开发和表征这种特殊的多孔结构。首先，通过对块状试样进行实验测试，对选择性激光熔化（SLM）制造的钛的性能进行了表征。然后，根据几个机械和几何标准，设计了一种多孔结构的基本图案，以模拟人体骨骼的各向异性特性。有限元分析（FEA）用于优化图案。最终采用 53%的孔隙率和 860 至 1500μm 范围内的孔径。然后对多孔试样进行拉伸试验，以验证数值上获得的性能，并确定试样的失效模式。最后，对多孔试样进行弹塑性有限元分析，以提出用于多孔替代物设计的失效准则。
