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Meso-scale stress response of thin ceramic membranes with honeycomb support

机译:蜂窝支撑陶瓷薄膜的细观应力响应

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Planar solid oxide fuel cells are made up of repeating sequences of electrolytes, electrodes, seals, and current collectors. For electrochemical reasons it is best to keep the electrolyte as thin as possible. However, for electrolyte-supported cells, the thin electrolytes are susceptible to damage during production, assembly, and operation. One of the latest generation electrolytes employs a meso-scale honeycomb layer to support thin, electrochemically efficient membranes. Using finite element analysis, a two-scale model computes distributions of first principal stresses throughout a representative unit cell of the meso-scale structure. Displacement at the macro-scale is informed by meso-scale geometry via a homogenized equivalent stiffness, while the stresses at the two scales are related via a scalar magnification factor. The magnification factor is computed for a variety of geometries and loading conditions. Physical specimens are measured in tension to obtain an experimental magnification factor which agrees well with the simulations. When both the stiffness and magnification factor for a given meso-scale pattern are known, the macro-scale geometry can be analyzed without revisiting the meso-scale model, thus reducing computational time and costs.
机译:平面固体氧化物燃料电池由重复的电解质,电极,密封件和集电器组成。出于电化学原因,最好保持电解质尽可能薄。然而,对于电解质支持的电池,稀薄的电解质在生产,组装和操作过程中易于损坏。最新一代的电解质之一采用中尺度蜂窝层来支撑电化学效率高的薄膜。使用有限元分析,两尺度模型可计算出中尺度结构的代表性晶胞中第一主应力的分布。宏观尺度上的位移是通过均质的等效刚度由中尺度几何结构决定的,而两个尺度上的应力则通过标量放大系数来关联。针对各种几何形状和加载条件计算放大倍数。测量物理样品的张力以获得与模拟吻合的实验放大倍数。当已知给定中尺度图案的刚度和放大倍数时,可以在不重新访问中尺度模型的情况下分析宏观尺度的几何形状,从而减少了计算时间和成本。

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