Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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The Numerical Analysis for the Surface Crack Behavior in the Planar Solid Oxide Fuel Cell

평판형 고체산화물 연료전지 표면균열거동에 관한 수치해석

  • Park, Cheol Jun (Department of Safety Engineering, Pukyong National University) ;
  • Kwon, Oh Heon (Department of Safety Engineering, Pukyong National University) ;
  • Kang, Ji Woong (Faculty of Health Science, Daegu Haany University)
  • 박철준 (부경대학교 안전공학과) ;
  • 권오헌 (부경대학교 안전공학과) ;
  • 강지웅 (대구한의대학교 보건학부)
  • Received : 2018.05.18
  • Accepted : 2018.08.24
  • Published : 2018.10.31
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Abstract

A fuel cell is an energy conversion device that converts a chemical energy directly into an electrical energy and has higher energy efficiency than an internal combustion engine, but solid oxide fuel cell (SOFC) consisting of brittle ceramic material remains as a major issue regarding the mechanical properties as the crack formation and propagation. In this study, the stress distribution and crack behavior around the crack tip were evaluated, due to investigated the effects of the surface crack at the operating condition of high temperature. As a result, the difference of the generated stress was insignificant at operating conditions of high temperature according to the surface crack length changes. This is because, the high stiffness interconnect has a closed structure to suppress cell deformation about thermal expansion. The stress intensity factor ratio $K_{II}/K_I$ increased as the crack depth increased, at that time the effect of $K_{II}$ is larger than that of $K_I$. Also the maximum stress intensity factor increased as the crack depth increased, but the location of crack was generated at the electrolyte/anode interface, not at the crack tip.

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References

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