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首页> 外文会议>7th Biennial Conference on Engineering Systems Design and Analysis 2004(ESDA 2004) vol.1: Advanced Energy Systems; Advanced Heat Transfer in Engineering Systems; ... >MECHANICAL PROPERTIES MEASUREMENT OF ELECTROACTIVE POLYMERS
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MECHANICAL PROPERTIES MEASUREMENT OF ELECTROACTIVE POLYMERS

机译：电化学聚合物的力学性能测量

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Electroactive polymers (EAPs), such as piezoelectric polymer, polyelectrolyte gels, dielectric elastomer and conducting polymer etc., are emerging as a new type of actuation materials for a broad range of actuator and transducer applications, because of their higher strain, higher response and higher efficiency. Acrylic elastomer films have demonstrated higher specific energy density (0.4J/g) and more than 100% actuated strains, and have been recommended for the artificial muscle actuators. Much research has been carried out to investigate the actuation properties of EAP films, however, little information is available for the mechanical properties of EAP films, which are crucial for designing EAP actuators. This work focuses on developing a means of characterizing the mechanical properties of EAP thin film materials, describing the mechanical behavior with the suitable constitutive models and determining the material parameters for the development of actuators. To measure the mechanical properties of EAP films, a uniaxial testing system is developed, which consists of a small-scale force transducer, a CCD camera, a National Instruments card and a laser displacement transducer. The loading and unloading cycles on film specimens are controlled by an Instron Machine. The applied force and the total are stored in the computer by the National Instrument card. A sequence of 2D images are recorded by the CCD camera to capture the deformation process of the film sample. Then, the displacements of the marks on the film surface vertical to the thickness plane are calculated from the sequential images by image analysis techniques. There are several well-known models available to describe the mechanical behaviors of the EAP films, such as Neo-Hookean, Mooney-Rivlin and Ogden models etc. To determine the most suitable constitutive models and corresponding material constants, a generalized method based on finite element analysis is proposed and implemented by interfacing with ABAQUS finite element package. The kernel of the method is to minimize the difference between the measured displacement field and the computed displacement field. A global optimisation algorithm, simulated annealing (SA), is used to minimize the objective. The experimental investigation on the mechanical properties of the dielectric elastomer film (VHB4910) is presented as an example to demonstrate the functions of the testing system and the developed method. The developed testing system and method can also be used for characterizing the mechanical properties of other EAP film materials.
机译：电活性聚合物（EAP），例如压电聚合物，聚电解质凝胶，介电弹性体和导电聚合物等，由于其较高的应变，较高的响应速度和较高的响应速度，正成为一种新型的致动材料，广泛用于各种致动器和换能器应用。更高的效率。丙烯酸弹性体薄膜已显示出更高的比能量密度（0.4J / g）和超过100％的致动应变，并已推荐用于人造肌肉致动器。已经进行了很多研究来研究EAP薄膜的致动特性，但是，关于EAP薄膜的机械性能的信息很少，这对于设计EAP致动器至关重要。这项工作的重点是开发一种表征EAP薄膜材料的机械性能，描述具有合适本构模型的机械性能以及确定用于执行器开发的材料参数的方法。为了测量EAP薄膜的机械性能，开发了一种单轴测试系统，该系统由小型力传感器，CCD相机，National Instruments卡和激光位移传感器组成。薄膜样品的装卸循环由Instron机器控制。施加的力和总和通过国家仪器卡存储在计算机中。 CCD相机记录一系列2D图像，以捕获胶片样本的变形过程。然后，通过图像分析技术从连续图像计算垂直于厚度平面的膜表面上的标记的位移。有几种描述EAP薄膜力学行为的著名模型，例如Neo-Hookean模型，Mooney-Rivlin模型和Ogden模型等。为了确定最合适的本构模型和相应的材料常数，一种基于有限元的通用方法通过与ABAQUS有限元程序包的接口提出并实施了有限元分析。该方法的核心是最小化测得的位移场和计算出的位移场之间的差异。全局优化算法（模拟退火（SA））用于最小化目标。以介电弹性体薄膜（VHB4910）的力学性能为例进行了实验研究，以演示测试系统的功能和开发的方法。开发的测试系统和方法还可用于表征其他EAP薄膜材料的机械性能。

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