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31 March 2009 Observation of creep behavior of cellulose electro-active paper (EAPap) actuator
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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.
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Joo-Hyung Kim, Sang-Woo Lee, Gyu-Young Yun, Chulho Yang, Heung Soo Kim, and Jaehwan Kim "Observation of creep behavior of cellulose electro-active paper (EAPap) actuator", Proc. SPIE 7289, Behavior and Mechanics of Multifunctional Materials and Composites 2009, 72891I (31 March 2009);

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