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光敏液晶弹性体在紫外光的照射下可以发生自发性的弯曲变形。基于各向同性线弹性材料小变形假设,建立了单畴向列相光敏液晶弹性体薄板的光致弯曲模型。通过定义光力矩,将光的效应引入挠度的控制方程和边界条件。均匀光照下,给出了四边简支边界条件下的挠度解析表达式,探讨了相关参数对弯曲行为的影响。均匀照射下,光场参数对单畴向列相液晶弹性体薄板弯曲的形状没有影响,其仅仅影响光致弯曲的程度,而单畴向列相液晶弹性体的指向矢取向不仅影响弯曲程度,更重要地对弯曲形状也产生很大的影响。
The photosensitive liquid crystal elastomer can spontaneously bend under ultraviolet light irradiation. Based on the assumption of small deformation of isotropic linear elastic material, a photo-induced bending model of a single-domain nematic phase-sensitive liquid crystal elastomer sheet was established. By defining the optical moment, the effect of light is introduced into the governing equations of deflection and the boundary conditions. Under uniform illumination, the analytical solution of the deflection under four simple boundary conditions is given, and the influence of relevant parameters on the bending behavior is discussed. Under uniform illumination, the parameters of the light field have no effect on the bending shape of the single-domain nematic liquid crystal elastomer sheet, which only affects the degree of photo-bending. The director orientation of single-domain nematic liquid crystal elastomer not only affects the bending degree, More importantly, the curved shape also has a great impact.