Mismatch effect of material creep strength on creep damage and failure probability of planar solid oxide fuel cell.

The constraint effect with material parameters mismatch between every parts of planar solid oxide fuel cell (SOFC) plays an important role in the operation life. In this study, the mismatch effect of material creep strength coefficient on creep damage and failure probability of planar SOFC was investigated by finite element method. The results show that the maximum equivalent creep strain and failure probability of SOFC are located in the outer corner of sealant layer. With the increase of the creep strength coefficient of the sealant layer, the maximum creep damage, damage area and failure probability of the sealant layer all increase gradually. The creep strength coefficient of the sealant layer is suggested to be smaller than that of the frame material, which will improve service life of SOFC. • Effect of material constraint on creep and failure probability of SOFC was studied. • The maximum creep damage and failure probability are located in sealant layer. • The higher mismatch with softer sealant makes the SOFC more prone to creep damage failure. • The sealant layer is suggested to has smaller creep coefficient than the frame. [ABSTRACT FROM AUTHOR]