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Stiff, strong zero thermal expansion lattices via the Poisson effect

机译：通过泊松效应的刚性强零热膨胀晶格

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摘要

Designing structures that have minimal or zero coefficients of thermal expansion (CTE) are useful in many engineering applications. Zero thermal expansion is achievable with the design of porous materials. The behavior is primarily stretch-dominated, resulting in favorable stiffness. Two and three-dimensional lattices are designed using ribs consisting of straight tubes containing two nested shells of differing materials. Differential Poisson contraction counteracts thermal elongation. Tubular ribs provide superior buckling strength. Zero expansion is achieved using positive expansion isotropic materials provided axial deformation is decoupled by lubrication or segmentation. Anisotropic materials allow more design freedom. Properties of two-dimensional zero expansion lattices, of several designs, are compared with those of triangular and hexagonal honeycomb nonzero expansion lattices in a modulus-density map. A three-dimensional, zero expansion, octet-truss lattice is also analyzed. Analysis of relative density, mechanical stiffness, and Euler buckling strength reveals high stiffness in stretch-dominated lattices and enhanced strength due to tubular ribs.
机译：设计具有最小或零热膨胀系数（CTE）的结构在许多工程应用中很有用。通过多孔材料的设计可以实现零热膨胀。该行为主要是拉伸为主的，从而导致良好的刚度。使用由直管组成的肋来设计二维和三维晶格，这些直管包含两个不同材料的嵌套壳。差分泊松收缩抵消了热伸长。管状肋骨具有出色的屈曲强度。使用轴向膨胀的各向同性材料可以实现零膨胀，前提是轴向变形通过润滑或分段来分离。各向异性材料允许更多的设计自由度。在模量-密度图中，将几种设计的二维零膨胀晶格的特性与三角形和六角形蜂窝非零膨胀晶格的特性进行了比较。还分析了三维零膨胀八角形桁架晶格。相对密度，机械刚度和欧拉屈曲强度的分析显示，拉伸支配晶格具有较高的刚度，并且由于管状肋而提高了强度。

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  • 来源
    《Journal of Materials Research》 |2013年第17期|2499-2508|共10页
  • 作者

    Jeremy Lehman; Roderic Lakes;

  • 作者单位

    Department of Engineering Physics, Engineering Mechanics Program, University of Wisconsin-Madison,Madison, Wisconsin 53706-1687;

    Department of Engineering Physics, Materials Science Department and Rheology Research Center,University of Wisconsin-Madison, Madison, Wisconsin 53706-1687;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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