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An investigation of the mechanical behavior of three-dimensional low expansion lattice structures fabricated via laser printing

机译：激光印刷制造的三维低膨胀晶格结构的力学行为研究

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摘要

A feasibility study of the fabrication of a specific type of low expansion lattice structure via 3-D laser printing has been conducted. In addition, a detailed baseline understanding of the mechanical response of a specific low thermal expansion lattice geometry has been established. The printed Ti-6Al-4V structures exhibit robust mechanical behaviour and fail via initial buckling followed by strengthening and then fracturing of the struts. Finite element simulation can predict the mechanical behaviour of the printed structures with a good degree of accuracy until the onset of buckling, which is the first point of failure. An analytical model has also been constructed, and homogenization techniques have been implemented to determine the effective stiffness and strength of the lattice structure arranged periodically to be used in sandwich panels. The analytical studies of the lattice structure performance show that the low CTE lattices are suitable for lightweight applications. Additionally, analysis has been performed to optimise the design of a bi-material lattice structure and the optimised design was found to have better performance compared to the bulk material while maintaining a low coefficient of thermal expansion for most cases studied. The techniques used in this paper can serve as a foundation for future studies to optimise and improve such lattice structures.
机译：已经进行了通过3-D激光印刷制造特定类型的低膨胀晶格结构的可行性研究。另外，已经建立了对特定低热膨胀晶格几何形状的机械响应的详细基线理解。印刷的Ti-6Al-4V结构表现出强大的机械性能，并且由于最初的屈曲继之以加固，然后断裂而断裂。有限元模拟可以很好地预测印刷结构的机械性能，直到屈曲开始，这是失效的第一点。还构建了一个分析模型，并采用了均化技术来确定周期性排列以用于夹芯板的晶格结构的有效刚度和强度。晶格结构性能的分析研究表明，低CTE晶格适用于轻质应用。此外，已经进行了分析以优化双材料晶格结构的设计，并且在大多数情况下，与散装材料相比，优化的设计具有更好的性能，同时保持较低的热膨胀系数。本文中使用的技术可以作为未来研究的基础，以优化和改进此类晶格结构。

著录项

  • 来源
    《Composite Structures》 |2018年第12期|80-94|共15页
  • 作者

    Mercer C.; Lee J.; Balint D. S.;

  • 作者单位

    Natl Inst Mat Sci, Res Ctr Struct Mat, Surface & Adhes Sci Grp, Tsukuba, Ibaraki, Japan;

    Imperial Coll London, Dept Mech Engn, London, England;

    Imperial Coll London, Dept Mech Engn, London, England;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Lattice; 3-D printing; Finite element; Analytical modelling;

    机译：晶格;3D打印;有限元;分析建模;

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