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arXiv 2103.01864cond-mat.soft
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液晶弹性体的不稳定性

Instabilities in liquid crystal elastomers

L. Angela Mihai, Alain Goriely

摘要:

稳定性是液晶弹性体研究的一个重要和富有成效的途径。在恒温下,当拉伸时,向列相体的均匀状态变得不稳定,并且在非常低的应力下产生交替的剪切条纹。此外,这些材料可以经历经典的机械效应,例如颈缩、空隙成核和空化以及膨胀不稳定性,这些都是从它们的聚合物网络继承的。我们研究了以下两个问题:第一,弹性体中的不稳定性与纯弹性固体中的不稳定性有何不同?第二,如果材料常数波动,这些现象如何改变?为了回答这些问题,我们提出了一个系统的研究中发生的不稳定性的双液晶弹性体,并检查的贡献的双组分和波动的模型参数,遵循概率定律。这种综合分析可能会导致更现实的估计随后的机械损伤的固体材料。

英文摘要:

Stability is an important and fruitful avenue of research for liquid crystal elastomers. At constant temperature, upon stretching, the homogeneous state of a nematic body becomes unstable, and alternating shear stripes develop at very low stress. Moreover, these materials can experience classical mechanical effects, such as necking, void nucleation and cavitation, and inflation instability, which are inherited from their polymeric network. We investigate the following two problems: First, how do instabilities in nematic bodies change from those found in purely elastic solids? Second, how are these phenomena modified if the material constants fluctuate? To answer these questions, we present a systematic study of instabilities occurring in nematic liquid crystal elastomers, and examine the contribution of the nematic component and of fluctuating model parameters that follow probability laws. This combined analysis may lead to more realistic estimations of subsequent mechanical damage in nematic solid materials.

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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