【作者】 彭瀚旻； 李华峰； 丁庆军； 赵淳生；

【Author】 PENG Han-min,LI Hua-feng,DING Qing-jun,ZHAO Chun-sheng (Nanjing University of Aeronautics and Astronautics,Nanjing,210016,P. R. China)

【机构】 南京航空航天大学精密驱动研究所；

【摘要】 类似于压电材料,离子型人工肌肉材料IPMC(ionicpolymer-metal composite)是一种电活性聚合物,它具有低电压驱动的特点,1～5V电压可以激发出材料末端的大变形。当今世界上有许多关于IPMC材料电激励的分析模型,但是它们中大部分是研究IPMC悬臂梁的自由段的电激励响应模型。然而,论文作者在实验中发现IPMC梁的固定端在激励过程中起到了一定作用。在本论文中,作者将依据Nemat-Nasser的理论模型对IPMC人工肌肉材料的非线性电激励响应进行建模分析。文中选取一块表面电阻很大的IPMC薄膜为算例,当3V激励电压被施加于薄膜的铜电极上时,其自由段上距离根部2mm(自由段总长约为41mm)处就已经下降到40mV左右。目前,本文作者还未见国际上有相关方面的报道,因此本文建立了一个计算模型去解释并仿真由IPMC的根部变形引起的末端变形。通过使用新胡克模型和能量守恒方法,以及数值计算方法可以得到机械、化学和电场三场耦合的分析计算结果,它可以解释根部变形现象,并且显示了一个更加精确的IPMC末端变形仿真结果。所以这个模型有利于提高IPMC薄膜的电激励仿真的精确度,特别适用于IPMC薄膜材料的寿命研究(大表面电阻意味着薄膜老化)。更多还原

【Abstract】 similar to piezoelectric materials,ionic polymer-metal composite (IPMC) as a type of electroactive polymer (EAP) possesses the characteristics:when applying a small voltage (1～5V),there is large deformation of IPMC. Nowadays,there are many modeling methods for discussing the principal of IPMC electric excitation,and most of them focused on the free part of IPMC beam. However,we found that the fixed end of beam also played a significant role in electric actuation. In this paper,based on Nemat-Nasser model,we developed an improved model to explain the initial nonlinear response of electric actuation on the deformation of the fixed end. An IPMC strip sample with a large surface resistance is chosen for analysis,the excitation voltage (3V) was applied completely in the copper electrodes,but it dramatically decreased from 3V to nearly 0 (about 40mV) 2mm away from the electrodes (41mm free length of IPMC strip). There is still not relative IPMC model for explaining or simulating this phenomenon in the world,so in this paper we will build up one for obtaining accurate simulation. Using a neo-Hookean model and conservation of energy,we carry out the numerical analysis based on the mechanical,electrical and chemical coupling field modeling. The results of the modeling for the fixed end show a more accurate simulation on the actual deformation of IPMC strip. Therefore,this model may be beneficial for more precise calculation of IPMC electric excitation response; especially for the IPMC working life research.更多还原