Composites with Inclusions of Negative Bulk Modulus: Extreme Damping and Negative Poisson’s Ratio
Composites with Inclusions of Negative Bulk Modulus: Extreme Damping and Negative Poisson’s Ratio
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DOI：
10.1177/0021998305051112
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发表时间：
2005-09
影响因子：
2.9
通讯作者：
Yun-Che Wang;R. Lakes
中科院分区：
文献类型：
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作者：
Yun-Che Wang;R. Lakes
研究了弹性复合材料中负体积弹性模相的影响。负体弹性系数K<；0在选定的单胞中是可能的。在各向同性固体中，当负泊松比足够小，低于稳定极限(应力控制)1/4 1时，K<；0可以达到。如果用作夹杂物，这种材料即使很大，对于带的形成也是稳定的。结果表明，具有负体积弹性模量的球形夹杂物的复合材料的泊松比为负值，复合材料的体积弹性模量和杨氏弹性模量(以及相应的机械阻尼)出现反常，而剪切弹性模量则没有变化。
The effect of a negative bulk modulus phase in elastic composites is studied. Negative bulk modulus K<0 is shown to be possible in selected unit cells. In isotropic solids, K<0 can be attained when negative Poisson’s ratio is sufficiently small, below the stability limit (for stress control) 1/4 1. Such materials, if used as inclusions, are predicted to be stable with respect to the band formation, even if they are large. Composites with spherical inclusions of negative bulk moduli are shown to exhibit negative Poisson’s ratio and anomalies in composite bulk modulus and Young’s modulus (and in the corresponding mechanical damping) but not in the shear modulus.