Virtual testing of self-healing ceramics toward backcasting-material design

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04088
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 18010:Mechanics of materials and materials-related
• Research Institution: Yokohama National University
• Principal Investigator: Ozaki Shingo 横浜国立大学, 大学院工学研究院, 准教授 (20408727)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 自己治癒セラミックス / 破壊強度 / 破壊力学 / 有限要素法 / 損傷モデル / 反応速度論 / 構成式 / ワイブル分布

Outline of Final Research Achievements

To achieve social implementation of self-healing ceramics, this study aims to establish a backcasting material design scheme that can relate the microstructural conditions to the required performance as structural members. To this end, a methodology for virtual numerical experiments has been developed as a basis for the backcasting scheme. Specifically, the "damage and self-healing constitutive model" and the "numerical analysis method of fracture statistics" for which the frameworks have been proposed by the authors, were precisely examined. Then, the generalization was achieved by specifying concrete forms such as various evolution laws based on reaction kinetics and probability density functions of defect distribution. The obtained results enables "highly accurate simulation of the crack repair process in conjunction with stochastic fracture simulation".

Free Research Field

機械材料・材料力学

Academic Significance and Societal Importance of the Research Achievements

国内外の研究機関において，自己治癒性を有するセラミックス，ポリマーおよびコンクリートなどの開発が取り組まれている．次世代のスマート材料の本命とされるこれらの材料は，損傷発生時に，化学反応を積極的に活用することで微小き裂を再結合し，健全な状態へと自律的に回復できる．中でも，酸化物系自己治癒セラミックス基複合材は比強度，耐熱性および耐腐食性に優れているため，各種高温部材への適用が期待されている．今後，提案した材料設計スキームが活用されることで，産業界は新材料実用化のリスクやコストを低減でき，さらに学術界との連携より，実用化・標準化までの期間を大幅に短縮し得る可能性がある．