Warner M, Mahadevan L
Cavendish Laboratory, Madingley Road, Cambridge, CB3 0HE, United Kingdom.
Phys Rev Lett. 2004 Apr 2;92(13):134302. doi: 10.1103/PhysRevLett.92.134302.
Photoresponsive solids such as nematic photoelastomers can undergo large deformations induced by light absorbed into rodlike molecules which bend and disrupt liquid crystal order. Significant variation of photoabsorption through the solid leads to nonuniform elastic deformations such as bending of beams and plates and pitting of layers. Such effects are also found in the presence of inhomogeneous thermal or swelling fields in solids or gels. We analyze the small deflection limit of these problems and show that beams made of these materials can have two elastically neutral planes, and that plates of these materials have a typical saddle shape. We also give a scaling analysis of the elasticity of photoinduced mounds and pits and speculate on their applications.
诸如向列型光弹性体之类的光响应性固体，可因棒状分子吸收光而发生大变形，这些分子弯曲并破坏液晶有序性。光在固体中的吸收存在显著变化，会导致诸如梁和板的弯曲以及层的点蚀等非均匀弹性变形。在固体或凝胶中存在不均匀热场或溶胀场时，也会出现此类效应。我们分析了这些问题的小挠度极限，表明由这些材料制成的梁可具有两个弹性中性面，且这些材料制成的板具有典型的鞍形。我们还对光致隆起和凹坑的弹性进行了标度分析，并推测了它们的应用。
