Observation of creep behavior of cellulose electro-active paper (EAPap) actuator
Observation of creep behavior of cellulose electro-active paper (EAPap) actuator
复制标题
纤维素电活性纸（EAPap）致动器蠕变行为的观察
DOI：
10.1117/12.815565
复制
发表时间：
2009
影响因子：
2.8
通讯作者：
Jaehwan Kim
中科院分区：
文献类型：
--
作者：
Joo;Sangwook Lee;Gyu;Chulho Yang;H. Kim;Jaehwan Kim
了解蠕变对执行机构的影响对于精确地计算材料的行为非常重要。研究了纤维素基电活性纸（EAPap）在不同恒载条件下的蠕变行为。蠕变实验后发现EAPap中的微纤丝结构发生了变化。通过SEM测量比较了制备态和蠕变后试样的结构差异。从不同加载条件下测量的蠕变行为中，随着测量时间的增加，清楚地观察到两个不同的诱导应变和电流区域。据认为，局部缺陷可能会出现，并成为微凹坑或微裂纹的形成，在较低的负载情况下，作为局部变形的进行，而细长纤维的直径收缩，只观察到在高水平的负载。因此，纤维素纳米纤维可以起到抵抗蠕变载荷和防止局部结构变形的作用。研究结果为深入理解薄粘弹性EAPap致动器的力学行为提供了有用的蠕变行为和机理。
Understanding of creep effects on actuating mechanisms is important to precisely figure out the behavior of material. Creep behaviors of cellulose based Electro-Active Paper (EAPap) were studied under different constant loading conditions. We found the structural modification of microfibrils in EAPap after creep test. Structural differences of as-prepared and after creep tested samples were compared by SEM measurements. From the measured creep behaviors by different loading conditions, two different regions of induced strain and current were clearly observed as the measurement time increased. It is consider that local defects may occur and becomes micro-dimple or micro-crack formations in lower load cases as localized deformation proceeds, while the shrinkage of diameter of elongated fibers was observed only at the high level of loading. Therefore, cellulose nanofibers may play a role to be against the creep load and prevent the localized structural deformations. The results provide useful creep behavior and mechanism to understand the mechanical behavior of thin visco-elastic EAPap actuator.