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首页> 外文期刊>Physica status solidi, B. Basic research >Negative thermal expansion from disc, cylindrical, and needle shaped inclusions
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Negative thermal expansion from disc, cylindrical, and needle shaped inclusions

机译：盘状，圆柱形和针状夹杂物的负热膨胀

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摘要

The concept of reducing the thermal expansion of composites by exploiting the thinning that is observed when a conventional material is mechanically stretched (the Poisson's effect) is explored through finite elements (FE) simulations with the scope of assessing the potential of such systems to exhibit negative thermal expansion (NTE). It is shown that systems made from hard highly expanding needle, cylindrical or coin shaped inclusions embedded within a soft matrix with a high positive Poisson's ratio having low coefficients of thermal expansion may exhibit NTE under certain conditions. In the case of the coin-shaped inclusions, the NTE is maximum in the direction orthogonal to the surface of the coins and in the case of systems with needle-shaped inclusions, the NTE is maximum in the direction orthogonal to the length of the needles.
机译：通过有限元（FE）模拟探索通过利用传统材料机械拉伸时观察到的变薄来减少复合材料热膨胀的概念，范围是评估此类系统显示负压的可能性。热膨胀（NTE）。结果表明，由硬质高膨胀的针状，圆柱形或硬币状夹杂物制成的系统，在一定条件下，可能会表现出NTE。在硬币状夹杂物的情况下，NTE在垂直于硬币表面的方向上最大，在具有针状夹杂物的系统中，NTE在垂直于针头长度的方向上最大。

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