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激光增材制造Ti6Al4V小梁结构的压缩行为研究

Study of the Compression Behaviour of Ti6Al4V Trabecular Structures Produced by Additive Laser Manufacturing.

作者信息

Benedetti Matteo, Klarin Johanna, Johansson Frida, Fontanari Vigilio, Luchin Valerio, Zappini Gianluca, Molinari Alberto

机构信息

Department of Industrial Engineering, University of Trento, via Sommarive 9, 38123 Trento, Italy.

School of Engineering, University of Jonkoping, 55318 Jönköping, Sweden.

出版信息

Materials (Basel). 2019 May 7;12(9):1471. doi: 10.3390/ma12091471.

DOI:10.3390/ma12091471
PMID:31067758
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6539632/
Abstract

The aim of this paper was to investigate the compression properties of several trabecular structures produced by additive laser manufacturing of a Ti6Al4V, having different densities and unit cells. Filling space structures were investigated, with different unit cells characterized by both bending-dominated and stretching-dominated behaviour. The stiffness and yield strength were correlated to relative density according to the Gibson and Ashby model. For a constant porosity, the stiffness and the yield strength varied between two extremes represented by the cubic structure (stretching-dominated deformation) and the cross structure (bending-dominated deformation). The properties of the deformed structures did not differ substantially from those of the regular structures. Only in the cubic structure did distortion enhance the contribution of bending to deformation and both stiffness and strength decreased. Cross structures displayed the highest strength at constant stiffness than the others, since they are characterized by the most favourable orientation of the struts.

摘要

本文旨在研究通过增材激光制造法制备的具有不同密度和晶胞的Ti6Al4V的几种小梁结构的压缩性能。研究了填充空间结构，不同的晶胞具有以弯曲主导和拉伸主导行为为特征。根据吉布森和阿什比模型，刚度和屈服强度与相对密度相关。对于恒定孔隙率，刚度和屈服强度在以立方结构（拉伸主导变形）和十字结构（弯曲主导变形）为代表的两个极端之间变化。变形结构的性能与规则结构的性能没有实质性差异。只有在立方结构中，变形才会增强弯曲对变形的贡献，刚度和强度都会降低。十字结构在恒定刚度下比其他结构表现出最高的强度，因为它们的支柱具有最有利的取向。

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