Modelling of thermomechanical stresses in a tubular design sofc

Computer modelling of the mechanical stress state originating at manufacturing and heating to a working temperature of cells of the SOFC of a tubular design with classical functional materials (Ni-YSZ)/YSZ/LSM is developed. Electrolyte-supported and anode-supported cells are observed, and also the residual stresses originating by manufacture of the module a cone-cone with direct anode-cathode contact are simulated. Simulation of process of manufacturing anode-supported cells display that there is no the stress, able to lead to cell rupture. However, the high level of the strain energy stored in the thin electrolyte layer, under certain conditions constitute the driving force for interfacial delamination. Manufacturing of electrolyte-supported cell leads to a high tension stress in an anode layer that leads the anode layer cracking. Heating of cells to a working temperature and reduction of anode material partially removes residual stress in the cell. Lines of boundary of the thin layers with a supporting tube concentrate significant radial stresses and can serve as the centres of delamination. The stress state of a cone electrolyte-supported cell does not exceed dangerous level.


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