- 學位論文
燃料電池質子交換膜應力分析與模擬
Stress Analysis and Simulation of Polymer Electrolyte Membrane (PEM) in the Fuel Cell
摘要
由於社會的進步及人口的快速成長，對能源的需求量有增無減，若没有開發新的能源與技術，人類很快便會面臨生存危機。傳統的一些發電方式，各有其不同的缺點，相形之下與具有零污染、低噪音、高效率及能廣範圍使用的燃料電池之相關研究，遂成為國際上爭相研發新能源科技的重點。 國內外對質子交換膜燃料電池的研究行之有年，由於質子交換膜會因反覆乾濕作用而遭到破壞，因此本研究目的針對質子交換膜乾濕狀態下的機械性質進行探討，以有限元素法與黏彈性理論分析乾濕膨脹所產生的應力與應變，同時也對於運作中的燃料電池進行潛變與鬆弛的分析，進而比較PTFE-Nafion複合膜與Nafion 211的差異。結果顯示，在相同的測試條件下，PTFE-Nafion複合膜因乾濕膨脹所產生的應力比Nafion 211小。另外在經由有限元素模擬結果可得知應力集中於材料的四個角，因此推測膜材破壞的區域。
並列摘要
Due to progress of human society and growing of population, the needs of energy resources were increased day by day. It is necessary to exploit new energy resources and energy technology. There were some deficiencies in traditional methods for generating electric power. Polymer electrolyte membrane of full cell (PEMFC) is a new material with non-pollution, few noise, high efficiency and could be generally applied. It has become an alteration in developing energy technology. The studies on PEMFC have been developed for several years. Because PEMFC will be deteriorated by cycling between wet and dry. The purposes of this study was to investigate the mechanical properties of cycling between wet and dry of PEMFC, to analyze swelling and shrinkage and stress by using finite element analysis based on Viscoelasticity ,to analyze creep and relaxation of PEMFC, and to compare the differences between PTFE-Nafion composite membranes and Nafion 211. The results showed under the same experimental condition, The stress generated from swelling of wet and dry of PTFE-Nafion composite membranes was smaller than that from Nafion 211.According to finite element analysis, stress was concentrated on the four corners of the material, these could be inferred to the destructive area of membrane.