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Titanium-silicon carbide composite lattice structures.

机译：钛-碳化硅复合晶格结构。

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摘要

Sandwich panel structures with stiff, strong face sheets and lightweight cellular cores are widely used for weight sensitive, bending dominated loading applications. The flexural stiffness and strength of a sandwich panel is determined by the stiffness, strength, thickness, and separation of the face sheets, and by the compressive and shear stiffness and strength of the cellular core. Panel performance can be therefore optimized using cores with high specific stiffness and strength. The specific stiffness and strength of all cellular materials depends upon the specific elastic modulus and strength of the material used to make the structure. The stiffest and strongest cores for ambient temperature applications utilize carbon fiber reinforced polymer (CFRP) honeycombs and lattice structures. Few options exist for lightweight sandwich panels intended for high temperature uses. High temperature alloys such as Ti-6A1-4V can be applied to SiC monofilaments to create very high specific modulus and strength fibers. These are interesting candidates for the cores of elevated temperature sandwich structures such as the skins of hypersonic vehicles. This dissertation explores the potential of sandwich panel concepts that utilize millimeter scale titanium matrix composite (TMC) lattice structures.;A method has been developed for fabricating millimeter cell size cellular lattice structures with the square or diamond collinear truss topologies from 240 mum diameter Ti-6A1-4V coated SiC monofilaments (TMC monofilaments). Lattices with relative densities in the range 10% to 20% were manufactured and tested in compression and shear. Given the very high compressive strength of the TMC monofilaments, the compressive strengths of both the square and diamond lattices were dominated by elastic buckling of the constituent struts. However, under shear loading, some of the constituent struts of the lattices are subjected to tensile stresses and failure is then set by tensile failure of the TMC monofilaments. Analytical expressions are derived for the elastic moduli and strength of the square and diamond TMC lattices and the predictions compared with measurements over the range of relative densities investigated in this study. Excellent agreement between the measurements and predictions is observed. In terms of specific shear strength, the TMC lattices outperform all other cellular materials investigated to-date including CFRP honeycombs while their compressive properties are comparable to CFRP honeycombs. However, the TMC lattices have a brittle response with catastrophic failure at their peak load. Thus, the TMC lattices appear promising candidate as cores in sandwich structures for elevated temperature and multifunctional applications, provided their limited ductility is not a significant constraint.
机译：具有坚硬，坚固的面板和轻质蜂窝状芯的夹芯板结构广泛用于重量敏感，弯曲为主的加载应用。夹芯板的抗弯刚度和强度由面板的刚度，强度，厚度和间隔以及蜂窝状芯的压缩和剪切刚度和强度确定。因此，可以使用具有高比刚度和强度的型芯来优化面板性能。所有多孔材料的比刚度和强度取决于用于制造结构的材料的比弹性模量和强度。适用于环境温度的最硬和最坚固的型芯使用碳纤维增强聚合物（CFRP）蜂窝和晶格结构。对于用于高温用途的轻质夹芯板，几乎没有选择。诸如Ti-6A1-4V之类的高温合金可应用于SiC单丝，以产生非常高的比模量和强度纤维。这些是高温夹心结构的核心（例如高超音速飞行器的蒙皮）的有趣候选。本文探讨了利用毫米级钛基复合材料（TMC）晶格结构的夹心板概念的潜力。;已开发出一种方法，可从240毫米直径的Ti-或方形或菱形共线桁架拓扑结构制造毫米单元尺寸的蜂窝晶格结构。 6A1-4V涂层的SiC单丝（TMC单丝）。制备相对密度在10％至20％范围内的格子，并在压缩和剪切下进行测试。考虑到TMC单丝的极高抗压强度，正方形和菱形晶格的抗压强度主要由组成支柱的弹性屈曲控制。然而，在剪切载荷下，晶格的一些组成支柱承受拉应力，然后通过TMC单丝的拉伸破坏来确定破坏。得出了方形和菱形TMC晶格的弹性模量和强度的解析表达式，并将预测值与本研究中研究的相对密度范围内的测量值进行了比较。观察到的测量结果和预测之间的极好的一致性。在比抗剪强度方面，TMC晶格优于迄今为止研究的所有其他多孔材料，包括CFRP蜂窝，而其压缩性能与CFRP蜂窝相当。但是，TMC晶格在其峰值载荷下具有脆性响应并发生灾难性故障。因此，TMC晶格似乎是有希望的候选物，可作为高温和多功能应用的三明治结构的核心，前提是其有限的延展性不是重要的限制。

著录项

  • 作者

    Moongkhamklang, Pimsiree.;

  • 作者单位

    University of Virginia.;

  • 授予单位 University of Virginia.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 197 p.
  • 总页数 197
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

  • 入库时间 2022-08-17 11:38:28

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