Residual stress change with time of a segmented-in-series solid oxide fuel cell using an in situ X-ray stress measuring method

► We succeeded in making real-time observation of change with time of residual stress on electrolyte. ► Real-time changes with time of mechanical behaviour in anode during re-oxidation were revealed. ► In ASP-type SOFC, the destruction was observed 20 min after the beginning of re-oxidation. ► In the SIS-type SOFC, the residual stress was almost constant for more than 4 h.