Elastoplastic Properties of Solid Oxide Fuel Cell Before and After Reduction  

作　　者：Xiang ZHAO Fenghui WANG 

机构地区：[1]Department of Engineering Mechanics, Northwestern Polytechnical University

出　　处：《Acta Metallurgica Sinica(English Letters)》2013年第2期137-142,共6页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.10772146);Excellent Doctorate Foundation of Northwestern Polytechnical University

摘　　要：Oliver Pharr method may overestimate the hardness because of the effect of pile up. In this paper, the mechanical properties of oxide fuel cell, such as hardness and elastic modulus, are determined by a work of indentation, then a reverse analysis algorithms is followed to analyze the yield strength. From the nanoindentation tests carried out for the half-cell structure of solid oxide fuel cells （SOFCs）, the typical mechanical properties are derived by the work of indentation and the reverse analysis algorithms. Due to the differences of Young＇s modulus and the mismatch of thermal expansion coefficients in the half-cell structure （NiO-YSZ/YSZ）, the residual stress, which has effects on the fuel cell＇s performance, is aroused during sintering. Numerical results show that the load-displacement curve is agreement with the experimental curve if the residual stress was considered.Oliver Pharr method may overestimate the hardness because of the effect of pile up. In this paper, the mechanical properties of oxide fuel cell, such as hardness and elastic modulus, are determined by a work of indentation, then a reverse analysis algorithms is followed to analyze the yield strength. From the nanoindentation tests carried out for the half-cell structure of solid oxide fuel cells （SOFCs）, the typical mechanical properties are derived by the work of indentation and the reverse analysis algorithms. Due to the differences of Young＇s modulus and the mismatch of thermal expansion coefficients in the half-cell structure （NiO-YSZ/YSZ）, the residual stress, which has effects on the fuel cell＇s performance, is aroused during sintering. Numerical results show that the load-displacement curve is agreement with the experimental curve if the residual stress was considered.

关 键 词：Solid oxide fuel cell Residual stress NANOINDENTATION Yield strength REDUCTION 

分 类 号：TM911.4[电气工程—电力电子与电力传动] TU352.12[建筑科学—结构工程]