3-Dimensional Numerical Stress Analysis around a Micro-Channel Wall Crack Tip in a Micro-PEMFC

• Main Authors: Yen-lung Huang, 黃衍龍
• Other Authors: none
• Format: Others
• Language: en_US
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/8vaa7f

碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 95 === The main aim of this study is to develop three dimensional models for micro flow-field plate of PEMFC and use numerical simulations to discuss the reliability of micro flow-field plate which works in real. A crack exists in the plate is loaded by the shear force, which is produced by the fuel H2 enter from inlet, and will propagate. The Ag, which is used to collect the electrons, will peel off and the efficiency of fuel cell will decrease. The commercial package software ANSYS was used to simulate the stress state around crack tip. Three modes of stress intensity factors KΙ, KΙΙ and KΙΙΙ, were calculated in order to describe the stressed behavior of crack. Finally, the inlet pressure, geometry of crack and channel size is changed and Taguchi method with ANOVA is used to find the factors which influence the stressed behavior of crack most. The simulation results show that KΙ and KΙΙ are influenced most by geometry of crack and KΙΙΙ is influenced more by geometry of crack and channel size