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Title: Mechanical Characterization of Electrolyte-supported Solid Oxide Fuel Cells Planar Solid Oxide Fuel Cells (SOFC) are made up of a repeating sequence of thin layers of energy producing ceramics. For electro-chemical reasons it is best to keep these layers as thin as possible, which also means that the cells are more mechanically susceptible to damage during production and/or operation. In electrolyte-supported SOFCs, an electrolyte layer can be designed having properties that are non-uniform across the plane of the layer but follow a repeating pattern. These layers, which are much smaller in thickness than they are in area, require a two-scale approach in order to model using finite elements; the smaller scale focuses on analyzing a representative area of the cell, while the larger examines the cell as a whole. To populate these models, an array of experimental techniques are needed. The small scale model requires bulk elastic properties of the electrolyte material, which are measured over a range of temperatures using a sonic resonance technique. This model then outputs “effective” properties for the large scale, which must be experimentally validated using four-point bend tests on representative samples.