Identification of Ni-YSZ Anode Creep Property Using PSO for Multiscale Simulation

Watanabe, S.; Iguchi, Fumitada; Sato, Kazuhisa; Yamamoto, Koji; Hashida, Toshiyuki; Terada, Kenjiro; Kawada, Tatsuya

doi:10.1149/05701.1379ecst

Cited by 3 publications

(2 citation statements)

References 7 publications

(12 reference statements)

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“…Non-linear stress-strain behaviors were observed with Ni-YSZ cermet anode at above 400˚C especially when Ni content was high. The creep rate was formulated by a timehardening constitutive equation (19). Inelastic behavior was observed for most nonstoichiometric oxide materials.…”

Section: Mechanical Properties Of Materials At Elevated Temperaturesmentioning

confidence: 99%

(High-Temperature Energy, Materials, & Processes Division Subhash Singhal Award) From Electrochemical to Mechanical Modeling of SOFCs and Their Experimental Validation

Kawada¹,

Watanabe²,

Budiman³

et al. 2023

ECS Trans.

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Tohoku University has been conducting research on the mechanical reliability of SOFCs under the financial support by NEDO (New Energy and Industrial technology Development Organization, Japan). Both numerical and experimental approaches have been taken at various levels, from electrochemical to structural analyses. An in-house code, SIMUDEL, was developed to simulate oxygen potential distribution inside the constituent materials in order to account for the chemical strain in cell/stack analyses. Non-linear stress-strain behaviors and inelastic deformation of the materials were characterized to improve the accuracy of the simulation. Predicting actual cell behavior, however, is still difficult, as unexpected factors often remain for each specific case. It is thus important to have in-situ or operando tools to observe the behavior of cells, such as deformation and stress generation. For that purpose, laser profilometer and X-ray stress analyzer were employed with a specially designed cell holder. Methods for evaluating local current density was also proposed. Currently, we are developing a protocol for testing robustness of planar SOFCs. Severe condition tests will be performed, and the results will be analyzed with the above-mentioned simulation.

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Section: Mechanical Properties Of Materials At Elevated Temperaturesmentioning

confidence: 99%

(High-Temperature Energy, Materials, & Processes Division Subhash Singhal Award) From Electrochemical to Mechanical Modeling of SOFCs and Their Experimental Validation

Kawada¹,

Watanabe²,

Budiman³

et al. 2023

ECS Trans.

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“…A typical creep curve contains three characteristic stages (3) In recent years, bending test methods such as 4-point-bending (4PB) method have been employed for evaluating the creep properties of the electrode materials in SOFCs. Watanabe et al (7) identified creep parameters for Ni-YSZ cermet using test data obtained from 4PB tests by using particle swarm optimization algorithm. J. Laurencin et al (8) measured the creep properties of porous Ni-8YSZ cermet under different temperatures from 700 to 850˚C and different applied stresses from 8.5 to 17 MPa by using 4PB, and found that the creep behavior of Ni-YSZ was controlled by 8YSZ matrix rather than metallic phase.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Creep Properties in Anode Materials for Solid Oxide Fuel Cells by Using Small Punch Testing Method

et al. 2019

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To assess the mechanical reliability and durability of solid oxide fuel cells (SOFCs), a suitable creep test method needs to be developed. The objective of this study is to examine the potential of small punch (SP) method as a simple creep testing method for SOFCs. In this study, the creep properties of Ni-YSZ composites were evaluated at temperatures of 800-900˚C, and at stresses of 47.3 to 89.8 MPa under 1% hydrogen environment. The obtained creep curves by the SP method showed three stages: initial transition creep, secondary creep, and tertiary stages. The central displacement versus time data obtained by the SP method was found to be characterized by a power law relationship. Even though quantitative comparisons need to be made with conventional methods, the above result suggests the usefulness of the SP methods for characterizing the creep properties in constituent materials of SOFCs.

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Creep constitutive law prediction via short-term evaluation using a small size testing method

et al. 2023

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Identification of Ni-YSZ Anode Creep Property Using PSO for Multiscale Simulation

Cited by 3 publications

References 7 publications

(High-Temperature Energy, Materials, & Processes Division Subhash Singhal Award) From Electrochemical to Mechanical Modeling of SOFCs and Their Experimental Validation

(High-Temperature Energy, Materials, & Processes Division Subhash Singhal Award) From Electrochemical to Mechanical Modeling of SOFCs and Their Experimental Validation

Evaluation of Creep Properties in Anode Materials for Solid Oxide Fuel Cells by Using Small Punch Testing Method

Creep constitutive law prediction via short-term evaluation using a small size testing method

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