2019 Fiscal Year Final Research Report
Fatigue fracture analysis and reliability estimation of ceramic ball subjected to thermal shock under variable temperature difference
| Project/Area Number |
17K14563
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Kagawa University |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | 熱衝撃疲労寿命分布 |
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| Outline of Final Research Achievements |
Cyclic thermal shock fatigue (CTSF) test was performed under constant temperature difference (CT) and two-step variable temperature difference (VT). As the result, the CT-CTSF life distribution was obeyed by 2-parameter Weibull distribution, but the VT-CTSF life distribution wasn't obeyed. Thus, a probabilistic model was established on the basis of slow crack growth (SCG) concept in conjunction with Weibull distribution for a brittle material subjected to multi-stage thermal shock stress. The measured and predicted curves were in good agreement. Therefore, it was theoretically showed that the VT-CTSF lifetime distribution was dominated by the variable temperature difference.
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| Free Research Field |
材料力学，材料強度学，破壊力学
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| Academic Significance and Societal Importance of the Research Achievements |
セラミック軸受球に対する変動温度差下での繰返し熱衝撃疲労（CTSF）データベース（CTSF寿命特性，球径依存性，損傷プロセス，損傷形態）を蓄積することができたため，セラミック軸受球の信頼性向上につながり，世界市場への普及加速に貢献できる．さらに変動温度差でのCTSF寿命を予測するための確率論的モデルが構築できたため，ハイエンド部品適用時の構造設計に活用できることが期待される．
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