力-电-初始取向对液晶凝胶薄膜均匀变形行为影响分析

发布时间：2018-06-07 08:35

本文选题：液晶凝胶 + 力-电耦合　；参考：《力学季刊》2017年04期

【摘要】：针对液晶凝胶在电场作用下的多场耦合多尺度力学行为,基于小应变假设,通过反逆法获得了有不同初始液晶指向方向的液晶凝胶薄膜在力-电耦合作用下均匀变形的解析模型.分析表明,电场与拉应力都可使液晶指向转动到与其平行的方向,当施加电场的方向与液晶初始取向垂直时,指向矢仅在超过一个临界电场强度后方会失稳转动,指向矢方向施加拉应力将增大所需阈值;而当液晶初始取向不与外加电场垂直时,电致指向矢转动将立即发生,其在力-电耦合下的指向矢转动和宏观变形行为与初始取向密切相关.因此,液晶凝胶的变形行为不仅可以通过力-电载荷进行控制,也可通过设计所需的初始液晶取向加以调节.
[Abstract]:In view of the multi-field coupling and multi-scale mechanical behavior of liquid crystal gel under the action of electric field, based on the assumption of small strain, The analytical model of uniform deformation of liquid crystal gel film with different initial liquid crystal orientation was obtained by inverse method under the coupling of force and electricity. The analysis shows that both electric field and tensile stress can make the direction of liquid crystal turn parallel to its direction. When the direction of applied electric field is perpendicular to the initial orientation of the liquid crystal, the direction vector will be unstable and rotate only after the intensity of the critical electric field exceeds one critical field. When the initial orientation of the liquid crystal is not perpendicular to the applied electric field, the electrically induced rotation of the pointing vector will occur immediately. The direction vector rotation and macroscopic deformation behavior are closely related to the initial orientation. Therefore, the deformation behavior of liquid crystal gel can be controlled not only by force and electric load, but also by the design of the initial liquid crystal orientation.
【作者单位】：复旦大学力学与工程仿真研究所;
【基金】：国家自然科学基金(11461161008,11602058) 上海市晨光计划(16CG01)
【分类号】：O648.17;O753.2

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