Influence of cell shape on mechanical properties of Ti-6Al-4V meshes fabricated by electron beam melting method
Influence of cell shape on mechanical properties of Ti-6Al-4V meshes fabricated by electron beam melting method
复制标题
泡孔形状对电子束熔炼Ti-6Al-4V网力学性能的影响
DOI：
10.1016/j.actbio.2014.06.010
复制
发表时间：
2014-10-01
影响因子：
9.7
通讯作者：
Murr, L. E.
中科院分区：
文献类型：
--
作者：
Li, S. J.;Xu, Q. S.;Murr, L. E.
在Materialise软件中采用电子束熔化(EBM)方法通过增材制造技术制备了不同元素(立方体、G7和菱形十二面体)的Ti-6Al-4V网状网格，并研究了单元形状对这些样品力学性能的影响。结果表明，这些孔隙率为88-58%的多孔结构的抗压强度和弹性模量分别在10-300 MPa和0.5-15 GPa范围内。这些网格的抗压强度和变形行为由支柱的屈曲和弯曲变形的耦合决定。以屈曲变形为主的网格表现出相对较高的抗毁强度，并且在应力-应变曲线中容易表现出脆性特征。对于以弯曲变形为主的网格，弹性变形与 Gibson-Ashby 模型很好地对应。通过增强弯曲变形的效果，应力-应变曲线特性可以从脆性转变为延性（平滑平台区域）。因此，可以使用 EBM 技术通过泡孔形状设计来制造具有高强度、低模量和理想变形行为的 Ti-6Al-4V 多孔固体。 (C) 2014 Acta Materialia Inc. 由 Elsevier Ltd 出版。保留所有权利。
Ti-6Al-4V reticulated meshes with different elements (cubic, G7 and rhombic dodecahedron) in Materialise software were fabricated by additive manufacturing using the electron beam melting (EBM) method, and the effects of cell shape on the mechanical properties of these samples were studied. The results showed that these cellular structures with porosities of 88-58% had compressive strength and elastic modulus in the range 10-300 MPa and 0.5-15 GPa, respectively. The compressive strength and deformation behavior of these meshes were determined by the coupling of the buckling and bending deformation of struts. Meshes that were dominated by buckling deformation showed relatively high collapse strength and were prone to exhibit brittle characteristics in their stress-strain curves. For meshes dominated by bending deformation, the elastic deformation corresponded well to the Gibson-Ashby model. By enhancing the effect of bending deformation, the stress-strain curve characteristics can change from brittle to ductile (the smooth plateau area). Therefore, Ti-6Al-4V cellular solids with high strength, low modulus and desirable deformation behavior could be fabricated through the cell shape design using the EBM technique. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.