Textured deformations in liquid crystal elastomers

Textured deformations in liquid crystal elastomers
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液晶弹性体中的纹理变形

DOI:
10.1080/02678290902879224
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发表时间:
2009
期刊:
影响因子:
2.2
通讯作者:
Biggins J
Biggins J
中科院分区:
化学3区
文献类型:
--
作者:
Biggins J

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液晶弹性体表现出非常丰富的弹性行为,因为它们耦合弹性场和移动的液晶序。一个引人注目的现象是纹理变形的形成:均匀的弹性体有时通过形成与施加的应变平均的非常不同的变形(纹理)的空间精细混合物来响应宏观均匀的施加的应变。这是因为一些大的应变可以通过液晶顺序的旋转来适应,所以它们几乎不需要能量来施加,而其他同样大(或更小)的应变不能,因此在能量上是昂贵的。如果宏观地施加这些后一种应变中的一种,则弹性体的能量降低,如果它可以形成平均到所施加的变形的较大但较低能量应变的精细混合物。在过去的10年里,在理解这种行为方面取得了很大的进展。在这里,我们回顾了关键的理论思想,并强调了几个值得实验关注的预测纹理。这篇评论假设很少有弹性或液晶弹性体的先验知识,所以希望它将是可访问的非弹性和弹性从其他领域,特别是马氏体的研究,这是一个高度相似的系统,但小应变和离散破碎对称性,而不是大应变和连续破碎对称性。
Liquid crystal elastomers exhibit very rich elastic behaviour because they couple elastic fields and mobile liquid crystal order. One striking phenomenon is the formation of textured deformations: a homogenous elastomer sometimes responds to a macroscopically homogenous imposed strain by forming a spatially fine mixture of very different deformations (a texture) that average to the imposed strain. This occurs because some large strains can be accommodated by rotation of the liquid crystal order, so they cost little energy to impose, while other equally large (or smaller) strains cannot and hence are energetically expensive. If one of these latter strains is imposed macroscopically, the elastomer's energy is lowered if it can form a fine mixture of larger but lower energy strains that average to the imposed deformation. Great progress has been made in understanding this behaviour over the last 10 years. Here, we review the key theoretical ideas and highlight several predicted textures which merit experimental attention. This review assumes little prior knowledge of elasticity or liquid crystal elastomers so hopefully it will be accessible to both non-elasticians and elasticians from other fields, notably the study of martensite which is a highly analogous system but with small strains and discrete broken symmetries rather than large strains and continuous broken symmetries.
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发表时间: 1997-02
影响因子: 4.6
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热弹性固体中的连续马氏体转变
DOI: 10.1080/01495738108909959
发表时间: 1981
影响因子: 2.8
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