Effects of variations of flow field and geometry of micro-channel on the cracked Ag-SU8 interface in a Micro-PEMFC

The efficiency of the fuel cell depends on both the kinetics of the electrochemical process and performance of the components. The main aim of this research is to analysis the effects of parameter variations of micro-channel on the cracked Ag-SU8 interface in a micro-PEMFC. An existed surface crack on the channel wall subjected to the flow induced compressive stresses and shear stresses will propagate and lead to the spall formation. In this paper, the KI and KII stress intensity factors at the crack tip are analyzed for the different crack sizes and loadings by Taguchi method and ANOVA. The results show that the inlet pressure and crack length affect the stress intensity factors more than the inlet velocity does. Also, the results show that as the crack length increases, the value of KI will increase, but the value of KII decreases slightly.