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arXiv 1207.2185cond-mat.mtrl-scicond-mat.dis-nncond-mat.stat-mech
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具有负压缩性转变的机械超材料

Mechanical Metamaterials with Negative Compressibility Transitions

Zachary G. Nicolaou, Adilson E. Motter

摘要:

当张紧时,普通材料沿着所施加的力的方向膨胀。在这里,我们探索网络概念,设计超材料表现出负压缩性过渡,在此期间,一种材料经历收缩时张紧(或膨胀时加压)。材料在施加张力的相同方向上的连续收缩,以及对该张力的响应,本质上是不稳定的。然而,我们所证明的概念上类似的效果可以通过使成分的(Meta)稳定平衡不稳定来实现。这些失稳引起应力诱导的固-固相变与扭曲的应力-应变关系的滞后曲线。负压缩性转变的应变驱动对应物是力放大现象,其中变形的增加引起响应力的不连续增加。我们建议,所提出的材料可能是有用的致动器,力放大器,微机械控制和保护装置的设计。

英文摘要:

When tensioned, ordinary materials expand along the direction of the applied force. Here, we explore network concepts to design metamaterials exhibiting negative compressibility transitions, during which a material undergoes contraction when tensioned (or expansion when pressured). Continuous contraction of a material in the same direction of an applied tension, and in response to this tension, is inherently unstable. The conceptually similar effect we demonstrate can be achieved, however, through destabilisations of (meta)stable equilibria of the constituents. These destabilisations give rise to a stress-induced solid-solid phase transition associated with a twisted hysteresis curve for the stress-strain relationship. The strain-driven counterpart of negative compressibility transitions is a force amplification phenomenon, where an increase in deformation induces a discontinuous increase in response force. We suggest that the proposed materials could be useful for the design of actuators, force amplifiers, micro-mechanical controls, and protective devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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