TY - GEN
T1 - Residual stress in NiO-YSZ composites and its relationship to microstructure
AU - Akaza, Y.
AU - Syu, T.
AU - Iguchi, Fumitada
AU - Shimizu, M.
AU - Yugami, H.
N1 - Publisher Copyright:
© The Electrochemical Society.
PY - 2015
Y1 - 2015
N2 - Residual stress in NiO-YSZ was numerically simulated using 2D models consisting of the arrays of NiO and YSZ particles to evaluate the influence of thermal stress due to the large difference of thermal expansion coefficient between NiO and YSZ. The influence of geometric microstructure changed by fabrication processes was also evaluated using the models with different arrangements. Numerical simulation revealed that thermal strains introduced from the hetero-interfaces canceled each other, and residual stress in a uniform model was small. But, in non-uniform model, residual stress increased because counterpart stress was absent at homo-interfaces due to non-uniformity. Simulation results also indicated that a part of particles near the interfaces was exposed to high residual stress as a reaction to thermal stress.
AB - Residual stress in NiO-YSZ was numerically simulated using 2D models consisting of the arrays of NiO and YSZ particles to evaluate the influence of thermal stress due to the large difference of thermal expansion coefficient between NiO and YSZ. The influence of geometric microstructure changed by fabrication processes was also evaluated using the models with different arrangements. Numerical simulation revealed that thermal strains introduced from the hetero-interfaces canceled each other, and residual stress in a uniform model was small. But, in non-uniform model, residual stress increased because counterpart stress was absent at homo-interfaces due to non-uniformity. Simulation results also indicated that a part of particles near the interfaces was exposed to high residual stress as a reaction to thermal stress.
UR - http://www.scopus.com/inward/record.url?scp=84938808298&partnerID=8YFLogxK
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U2 - 10.1149/06801.1291ecst
DO - 10.1149/06801.1291ecst
M3 - Conference contribution
AN - SCOPUS:84938808298
T3 - ECS Transactions
SP - 1291
EP - 1296
BT - Solid Oxide Fuel Cells 14, SOFC 2015
A2 - Singhal, S. C.
A2 - Eguchi, K.
PB - Electrochemical Society Inc.
T2 - 14th International Symposium on Solid Oxide Fuel Cells, SOFC 2015; held as part of the Electrochemical Society, ECS Conference on Electrochemical Energy Conversion and Storage
Y2 - 26 July 2015 through 31 July 2015
ER -