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 |
Research Field |
Materials/Mechanics of materials
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Research Institution | Kagawa University |
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 |
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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