Damage Modeling of Solid Oxide Fuel Cells Accounting for Redox Effects

材料科学 固体氧化物燃料电池 氧化还原 阳极 复合材料 肿胀 的 微观力学 热膨胀 氧化物 刚度 损伤力学 有限元法 电极 结构工程 冶金 化学 复合数 物理化学 工程类
作者
Ba Nghiep Nguyen,Naveen K. Karri,C. J. T. Mason,James F. Fitzpatrick,Brian J. Koeppel
出处
期刊:Journal of The Electrochemical Society [The Electrochemical Society]
卷期号:168 (11): 114514-114514 被引量:4
标识
DOI:10.1149/1945-7111/ac39de
摘要

This work applies a multiscale mechanistic damage model developed for brittle ceramics and implemented in commercial finite element (FE) packages via user subroutines to study progressive damage in solid oxide fuel cells (SOFC) subjected to thermomechanical loading under normal operating and shutdown conditions including redox effects. The damage model captures the micromechanics of stiffness reduction due to material porosity change and microcracking and integrates the as-obtained stiffness reduction law into a continuum damage mechanics (CDM) formulation for the evolution of microcracks up to fracture. The volumetric “swelling” that occurs during redox is treated in constitutive modeling similarly to thermal expansion, but swelling strains are irreversible. This damage model was first validated through predictions of strength and stress-strain response for the SOFC electrode materials. Next, it has been applied to predict the potential for degradation in a generic planar SOFC stack with large active area cells. Multicell stack models were simulated in both co-flow and counter-flow configurations. In addition, a constant temperature redox cycle was also simulated to capture overall cell electrode damage due to volumetric swelling of the nickel (Ni)-based anode in the anode-supported cells.
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