Ferroelastic constitutive model contributing to prolongation of SOFC life and establishment of next-generation fuel cell design guideline

• Project/Area Number: 16K17977
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Materials/Mechanics of materials
• Research Institution: Keio University (2018); Tohoku University (2016-2017)
• Principal Investigator: Muramatsu Mayu 慶應義塾大学, 理工学部(矢上), 講師 (20609036)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2017: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
• Keywords: SOFC / 強弾性 / Phase-field / 固体酸化物燃料電池 / 均質化法 / 機械材料・材料力学

Outline of Final Research Achievements

In this study, considering the development of microstructure of lanthanum strontium cobalt ferrite (LSCF), which is the cathode electrode of solid oxide fuel cell (SOFC), we developed a mathematical model that can express ferroelastic phenomena in SOFC. We implemented a coupled analysis program of Phase-field and deformation field, calculated macroscopic mechanical properties, and also considered the structure formed in external stress field. In addition, analysis for polycrystalline materials were performed. As a result, it was reproduced that lamellar structures of different variants and orientations were formed depending on the initial nucleation site and crystal orientation. Furthermore, from the analysis in the coupling homogenization method, the macroscopic deformation which occurs during the growth of the ferroelastic phase is shown.

Academic Significance and Societal Importance of the Research Achievements

これまでのSOFC性能評価にはもっぱら熱力学的もしくは電気化学的解析が行われてきたが，SOFC長期健全性予測のためには，長期稼動中の組織変化を考慮した変形シミュレーションこそが必要な数値解析となる．本研究は，実験に基づいて材料ダイナミクスレベルで強弾性の構成モデルを提案した．本解析技術によって，強弾性による特異な力学挙動が反映された長期耐久性解析結果を得ることができると予想され，次世代SOFC設計の指針策定がより簡便になる．これはSOFC内で生じる現象を明らかとする基礎研究の点でも，次世代SOFCの耐久性向上においても大きな意義があると考えている．

Research Products

• [Journal Article] Simulation of Ferroelastic Phase Formation Using Phase-field Model (2018)
  • Author(s): Muramatsu, M., Yashiro, K., Kawada, T. and Terada, K.
  • Journal Title: International Journal of Mechanical Sciences Volume: - Pages: 462-474
  • DOI: 10.1016/j.ijmecsci.2017.12.027
  • Peer Reviewed
• [Journal Article] Recent Achievements of NEDO Durability Project with an Emphasis on Correlation Between Cathode Overpotential and Ohmic Loss (2017)
  • Author(s): Yokokawa, H., Hori, H., Shigehisa, T., Suzuki, M., Inoue, S., Suto, T., Tomida, K., Shimazu, M., Kawakami, A., Sumi, H., Ohmori, M., Mori, N., Iha, T., Yamaji, K., Kishimoto, H., Develos-Bagarinao, K., Sasaki, K., Taniguchi, S., Kawada, T., Muramatsu, M., Terada, et al.
  • Journal Title: Fuel Cells Volume: 17 Issue: 4 Pages: 473-497
  • DOI: 10.1002/fuce.201600186
  • Peer Reviewed
• [Journal Article] NUMERICAL PLATE TESTING FOR NON-LINEAR MULTI-SCALE ANALYSIS OF PLATE-SHAPED DEVICE (2017)
  • Author(s): 佐藤維美，村松眞由，松原成志朗，西紳之介，寺田賢二郎，八代圭司，川田達也
  • Journal Title: Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)) Volume: 73 Issue: 2 Pages: I_283-I_294
  • DOI: 10.2208/jscejam.73.I_283
  • NAID: 130006329822
  • ISSN: 2185-4661
  • Peer Reviewed
• [Journal Article] Shape Deformation Analysis of Anode-supported Solid Oxide Fuel Cell by Electro-chemo-mechanical Simulation (2017)
  • Author(s): Muramatsu, M., Sato, M., Terada, K., Watanabe, S., Yashiro, K., Kawada, T., Iguchi, F. and Yokokawa, H.
  • Journal Title: Solid State Ionics Volume: 319 Pages: 194-202
  • DOI: 10.1016/j.ssi.2018.01.027
  • Peer Reviewed
• [Journal Article] A Simulation of Ferroelastic Phase Formation by Using Phase Field Model (2017)
  • Author(s): Muramatsu, M., Kawada, T. and Terada, T.
  • Journal Title: Key Engineering Materials Volume: 725 Pages: 208-213
  • DOI: 10.4028/www.scientific.net/kem.725.208
  • Peer Reviewed
• [Journal Article] Numerical simulations of non-stationary distributions of electrochemical potentials in SOFC (2017)
  • Author(s): Muramatsu, M., Yashiro, K., Kawada, T. and Terada, K.
  • Journal Title: Engineering Computations Volume: 印刷中
  • Peer Reviewed
• [Journal Article] Simulation Technology on SOFC Durability with an Emphasis on Conductivity Degradation of ZrO2-base Electrolyte (2017)
  • Author(s): Yokokawa, H., Kishimoto, H., Yamaji, K., Muramatsu, M., Terada, K., Yashiro, K. and Kawada, T.
  • Journal Title: Journal of Electrochemical Energy Conversion and Storage Volume: 14 Issue: 1
  • DOI: 10.1115/1.4036038
  • Peer Reviewed
• [Journal Article] Analysis System of Transient Electrochemo-mechanical Simulation of Solid Oxide Fuel Cell Implemented in Commercial FEM Software (2017)
  • Author(s): 佐藤維美，村松眞由，寺田賢二郎，渡辺智，八代圭司，川田達也，横川晴美
  • Journal Title: Transactions of the Japan Society for Computational Engineering and Science Volume: 2017 Issue: 0 Pages: 20170004-20170004
  • DOI: 10.11421/jsces.2017.20170004
  • NAID: 130005450288
  • ISSN: 1347-8826
  • Peer Reviewed
• [Presentation] Electrochemical Potential Simulation of Solid Oxide Fuel Cell Considering Phase Transformation of Zirconium Oxide (2018)
  • Author(s): Muramatsu, M., Ishiyama, T., Kishimoto, H., Yamaji, K., Yahiro, K., Kawada, T., Terada, K. and Yokokawa, H.
  • Organizer: 6th European Conference on Computational Mechanics (ECCM 6)-7th European Conference on Computational Fluid Dynamics (ECFD 7)
  • Int'l Joint Research
• [Presentation] An Analysis of Formation of Ferroelastic Phase in Metallic Oxide LSCF in Solid Oxide Fuel Cell (2018)
  • Author(s): Muramatsu, M., Kawada, T. and Terada, K.
  • Organizer: 13th World Congress on Computational Mechanics (WCCM2018)
  • Int'l Joint Research
• [Presentation] Substitution Approach for De-coupled Two-scale Analysis of Composite Plates (2018)
  • Author(s): Sato, M., Muramatsu, M., Terada, K., Kawada, T.
  • Organizer: 13th World Congress on Computational Mechanics (WCCM2018)
  • Int'l Joint Research
• [Presentation] A Simulation of Cubic to Rhombohedral Ferroelastic Phase Transformation of LSCF Based on Phase-field Model (2017)
  • Author(s): Muramatsu, M.*
  • Organizer: 4th Japanese-German Workshop on Computational Mechanics
  • Place of Presentation: Sendai, Tohoku university
  • Year and Date: 2017-03-27
  • Int'l Joint Research / Invited
• [Presentation] A Simulation of Ferroelastic Phase Formation in LSCF Polycrystal Based on Phase-field Model (2017)
  • Author(s): Muramatsu, M.
  • Organizer: 5th International Conference on Material Modeling (ICMM5)
  • Int'l Joint Research
• [Presentation] A Large Scale Electro-chemo-mechanical Analysis of Solid Oxide Fuel Cell Considering Creep Deformation Under Operation (2017)
  • Author(s): Muramatsu, M.
  • Organizer: 21st International Conference on Solid State Ionics (SSI2017)
  • Int'l Joint Research / Invited
• [Presentation] isualization of Potential Distribution in the YSZ Electrolyte under SOFC operation (2017)
  • Author(s): Kishimoto, H.
  • Organizer: 21st International Conference on Solid State Ionics (SSI2017)
  • Int'l Joint Research
• [Presentation] A Simulation of Ferroelastic Phase Formation by Using Phase-field Model (2016)
  • Author(s): Muramatsu, M.*, Kawada, T. and Terada, K.
  • Organizer: 13th Asia-Pacific Symposium on Engineering Plasticity and Its Applications
  • Place of Presentation: Hiroshima, Higashi Hiroshima Arts & Culture Hall Kurara
  • Year and Date: 2016-12-05
  • Int'l Joint Research
• [Presentation] 固体酸化物燃料電池材料LSCFの相変態-変形連成シミュレーション (2016)
  • Author(s): 村松眞由*, 八代圭司, 川田達也, 寺田賢二郎
  • Organizer: 第29回日本機械学会計算力学講演会
  • Place of Presentation: 名古屋, 名古屋大学
  • Year and Date: 2016-09-22
• [Presentation] An Analysis of Formation of Ferroelastic Phase in Metallic Oxide LSCF in Solid Oxide Fuel Cell (2016)
  • Author(s): Muramatsu, M.*, Kawada, T. and Terada, K.
  • Organizer: 12th World Congress on Computational Mechanics
  • Place of Presentation: Korea, Coex Convention & Exhibition Center
  • Year and Date: 2016-07-29
  • Int'l Joint Research
• [Presentation] Electrochemical Potential Analysis of Solid Oxide Fuel Cell Based on Reaction-diffusion Equations Considering Phase Transformation of Zirconium Oxide (2016)
  • Author(s): Muramatsu, M.*, Kishimoto, H., Yamaji, K., Yahiro, K., Kawada, T., Terada, K. and Yokokawa, H.
  • Organizer: VII European Congress on Computational Methods in Applied Sciences and Engineering
  • Place of Presentation: Greece, Creta Maris Conference Centre
  • Year and Date: 2016-06-06
  • Int'l Joint Research
• [Presentation] 強弾性相の発展を伴うLSCFのマルチスケールシミュレーション (2016)
  • Author(s): 村松眞由* 川田達也, 寺田賢二郎
  • Organizer: 第21回計算工学講演会
  • Place of Presentation: 新潟, 朱鷺メッセ 新潟コンベンションセンター
  • Year and Date: 2016-06-01