| Project/Area Number |
04452275
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属材料(含表面処理・腐食防食)
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
OIKAWA Hiroshi TOHOKU UNIV.FAC.OF ENG., PROFESSOR, 工学部, 教授 (30005243)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Hiroyuki TOHOKU UNIV.FAC.OF ENG., INSTRUCTOR, 工学部, 助手 (10225998)
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| Project Period (FY) |
1992 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥6,700,000 (Direct Cost: ¥6,700,000)
Fiscal Year 1994: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1993: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1992: ¥4,000,000 (Direct Cost: ¥4,000,000)
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| Keywords | C / C COMPOSITE / FOUR POINT BENDING / CREEP STRENGTH / CREEP / PLASTIC FLOW / HIGH TEMPERATURE STRENGTH / LONG-TERM STRENGTH / Cコンポジット / 曲げ試験 / 高温変形 / 複合材料 / クラリープ / 軽量材料 / 炭素繊維 |
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| Research Abstract |
High temperature bending and high temperature creep tests of eight layr C/C composites have been investigated and following results have been obtained.
(i) C/C composites creep at 1573K.The creep behavior is classified into logarithmic creep.
(ii) Slope of displacement-log (time) diagram depends on the applied load and increases as increasing load.
(iii) No obvious temperature dependence of yield stress has been observed at 1373-1573K.
(iv) C/C composites fracture at lower loads than UTS of fibers.
(v) Flow of the matrix strongly affects the yield strength and creep strength of C/C composites.
These results strongly suggest that strengthening of the matrix is important to improve long-term high-temperature strength.
As conclusions, it is suggested that prediction of long-term deformation characteristics of C/C composite be not possible based on the short-term deformation characteristics. Information of long-term high-temperature deformation characteristics of C/C composites is still lacking and further experimental investigation concerns with effects of deformation conditions are required to improve long-term strength.
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