Quantitative analysis for fracture behavior of fuel cells = 연료전지에서의 파괴 거동의 정량적 분석

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Fuel cell has received attention for eco-friendly and sustainable energy system. The fuel cells, which convert the chemical energy of fuel into the electrical energy, are classified with the type of electrolyte. PEMFC uses a proton-conducting polymer and SOFC uses an oxide ion-conducting ceramic material as the electrolyte. However, the reliability issues, such as mechanical degradation, has impeded the commercialization of fuel cell systems. To achieve the reliability and durability of the fuel cell, the fracture behavior of fuel cells was investigated. Cracks of PEMFC and interfacial robustness of SOFC were examined to analyze fracture behavior of the fuel cells. Cracks of PEMFC were quantified by crack area density and electrical resistance with electromechanical tests. Crack growth behavior showed difference with respect to the thickness of electrode. Thicker anode had larger and fewer cracks. For SOFCs, interfacial fracture energy was measured by double cantilever beam and subcritical crack growth tests were performed in humid environments. Threshold values of strain energy release rate were 0.04 and $0.03 J m^{-2}$ when relative humidity was 60 and 90 %. SEM observations were also conducted to inspect the surface and the interface precisely. The results have potential in the reliability improvement of fuel cells.
Advisors
Kim, Taek-Sooresearcher김택수researcher
Description
한국과학기술원 :기계공학과,
Publisher
한국과학기술원
Issue Date
2016
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 기계공학과, 2016.2 ,[iii, 26 p. :]

Keywords

Fuel cell; fracture behavior; interfacial fracture energy; crack; humidity; reliability; 연료전지; 파괴 거동; 계면파괴에너지; 균열; 습기; 신뢰성

URI
http://hdl.handle.net/10203/221237
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=649240&flag=dissertation
Appears in Collection
ME-Theses_Master(석사논문)
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