Influence of the structural orientation on the mechanical properties of selective laser melted Ti6Al4V open-porous scaffolds
Influence of the structural orientation on the mechanical properties of selective laser melted Ti6Al4V open-porous scaffolds
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DOI：
10.1016/j.matdes.2016.01.095
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发表时间：
2016-04-05
影响因子：
8.4
通讯作者：
Laufer, Nico
中科院分区：
文献类型：
--
作者：
Weissmann, Volker;Bader, Rainer;Laufer, Nico
为了降低种植体的刚度，研究了二维开孔设计(扭转设计)。采用Ti6Al4V材料，采用SLM工艺制备支架，通过单轴压缩试验测定材料性能。此外，对单元胞进行了不同方向的测试，确定了支架的力学性能，支架的弹性模量在3.4~26.3 Gpa之间，支架孔隙率在54~60%之间。压缩应变、抗压强度和弹性模数之间存在线性关系。结果表明，晶胞取向对弹性模量、抗压强度和应变有明显的影响。此外，在考虑晶胞取向的情况下，表征弹性模数和孔隙率之间关系的比屈服可以用函数形式来描述。我们成功地制造出力学性能接近人类皮质骨的支架。对细胞取向的影响说明了在评价骨支架材料时考虑载荷方向的必要性。(C)2016爱思唯尔有限公司。保留所有权利。
In order to reduce the implant stiffness, open-porous designs in two geometrical dimensions were investigated (twisted design). Scaffoldswere fabricated by an SLMprocess using Ti6Al4V and material properties were determined by conducting uniaxial compression testing. Furthermore, the unit cellwas tested in different orientations to determine the mechanical properties.The elastic modulus of the scaffolds varied between 3.4 and 26.3 GPa and scaffolds porosity ranged from 54 to 60%. Linear relationshipwas found between compression strain, compressive strength and modulus of elasticity. Results show a clear influence of the unit cell orientation on elastic modulus, compressive strength and strain. Moreover, the specific yielding that characterizes the relationship between modulus of elasticity and porosity under consideration of the cell orientation could be described in functional terms. We successfully generated scaffolds with mechanical properties close to those of human cortical bone. The influence on the unit cell orientation demonstrated the necessity of considering the load direction in the evaluation of bone scaffolds. (C) 2016 Elsevier Ltd. All rights reserved.