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基于修正Gibson-Ashby模型的钛合金多孔材料各向异性调控
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1.浙江大学 空间结构研究中心;2.浙大城市学院 先进材料增材制造创新研究中心

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Anisotropy Control of Titanium Alloy Porous Materials Based on the Modified Gibson-Ashby Model
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1.Space Structures Research Center,Zhejiang University;2.Additive Manufacturing Innovation Research Centre, Hangzhou City University

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    摘要:

    根据不同方向的承载需求,开展多孔材料力学性能的各向异性调控,可以有效提高材料承载效率,更好的满足轻量化需求。本文以G7、BCCZ型TC4钛合金多孔材料为例,提出了考虑孔结构几何参数的杆系多孔材料修正G-A模型,可为多孔材料的各向异性精细化调控提供指导;基于该计算模型,通过对传统胞元几何参数调整,获得一系列具有相似构型、不同性能的各向异性多孔材料,并通过正向及侧向压缩试验,研究了胞元几何参数对多孔材料各向抗压强度及破坏模式的影响,验证了修正模型的有效性。研究表明,杆系多孔材料的抗压强度由其胞元内部微杆件的长径比及倾斜角度决定,通过调整杆件倾斜角度可有效进行多孔材料各向力学性能的调控。相同密度下,将斜杆倾斜角度从35°提高至55°,可使G7、BCCZ型钛合金多孔材料的正向抗压强度大幅提升105%和45%,而侧向抗压强度仅损失16%和13%。

    Abstract:

    According to the varying load in different directions, the anisotropy control of porous materials can significantly enhance the load-bearing efficiency of materials, thus better addressing the need for lightweight designs. In this paper, a modified G-A model for srtut-based porous materials accounting for the geometric parameters was established by taking G7 and BCCZ types of TC4 porous materials as examples. This model could serve as a guide for the precise control of anisotropy for strut-based porous materials. By adjusting the geometric parameters of common unit cells, a range of anisotropic porous materials with similar configurations but distinct properties were created. The influence of cellular geometric parameters on the anisotropic mechanical properties and failure modes of these materials was investigated through both vertical and lateral compressive tests, which also validated the efficacy of our modified model. The research results indicated that the mechanical properties of strut-based porous materials were primarily determined by the aspect ratio and the inclination angle of their struts. By fine-tuning the inclination angle of these struts, the anisotropic mechanical properties of the porous materials can be effectively modulated. At identical density levels, it could result in a substantial increase in the vertical compressive strength of G7 and BCCZ types of TC4 porous materials by 105% and 45%, respectively, with only a minor reduction in lateral compressive strength of 16% and 13%, by increasing the inclination angle of the diagonal struts from 35° to 55°.

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丁超,谢腾龙,徐圣航,黄明浩,张兆洋,杨鑫,汤慧萍,赵阳.基于修正Gibson-Ashby模型的钛合金多孔材料各向异性调控[J].稀有金属材料与工程,,().[Ding Chao, Xie Tenglong, Xu Shenghang, Huang Minghao, Zhang Zhaoyang, Yang Xin, Tang Huiping, Zhao Yang. Anisotropy Control of Titanium Alloy Porous Materials Based on the Modified Gibson-Ashby Model[J]. Rare Metal Materials and Engineering,,().]
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  • 收稿日期:2024-09-13
  • 最后修改日期:2024-11-15
  • 录用日期:2024-11-18
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