| Project/Area Number |
24560842
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Hirosaki University |
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Principal Investigator |
SATO Hiroyuki 弘前大学, 理工学研究科, 教授 (10225998)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Shun-Ichiro 東北大学, 多元物質科学研究所, 教授 (00345943)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | 高温変形 / クリープ曲線 / 寿命予測 / 耐熱合金 / アルミニウム / 銅合金 / 組織勾配 / 残留応力 / ひずみ速度 / 内部応力 / 複合負荷 / 応力テンソル |
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| Outline of Final Research Achievements |
A quantitative method of creep curve evaluation by “Strain Acceleration and Transition Objective Index (SATO-Index)” is proposed and studied. The SATO-Index represents a shape of creep curve as strain rate sensitivity on strain during creep, and makes it possible to extrapolate entire creep curve from a part of creep curve. The possibility of better extrapolation of creep life with shorter experiments is suggested.
To obtain modulated microstructures, I made prototype equipment of “Rotary Bend and Tensile loading (RBT loading).” In aluminum alloys, modulated micro structures are formed by the prototype, and creep curves of samples with modulated microstructures are analyzed and compared by SATO-Index. It is concluded that SATO-Index handles and quantitatively characterizes different shapes of creep curve, and is a unique value that represents creep characteristics.
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