电活性聚合物薄膜的压缩失效
Compression-induced failure of electro-active polymeric thin films
摘要：
基于EAP薄膜的驱动器件由于压力的突然增大而产生裂纹，导致性能急剧下降直至失效。基于经典的弹性薄膜拉伸场论，我们提供了一个分析电活性聚合物（EAP）薄膜面内压缩突变的一般框架。我们的主要结果是推导出一个（电压依赖）域的拉伸空间，代表拉伸配置。在Mooney-Rivlin材料的假设下，我们得到，对于所施加的电压的增长值的域的合同，消失在一个临界电压以上的聚合物是褶皱的任何拉伸配置。我们的方法可以很容易地实现更复杂的材料行为的数值模拟，并提供了一个工具，作为弹性模量的函数的压缩不稳定性的分析。
英文摘要：
The insurgence of compression induces wrinkling in actuation devices based on EAPs thin films leading to a sudden decrease of performances up to failure. Based on the classical tension field theory for thin elastic membranes, we provide a general framework for the analysis of the insurgence of in-plane compression in membranes of electroactive polymers (EAPs). Our main result is the deduction of a (voltage-dependent) domain in the stretch space which represents tensile configurations. Under the assumption of Mooney-Rivlin materials, we obtain that for growing values of the applied voltage the domain contracts, vanishing at a critical voltage above which the polymer is wrinkled for any stretch configuration. Our approach can be easily implemented in numerical simulations for more complex material behaviors and provides a tool for the analysis of compression instability as a function of the elastic moduli.
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