| Project/Area Number |
16560083
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | KANAZAWA INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
MIYANO Yasushi KANAZAWA INSTITUTE OF TECHNOLOGY, COLLEGE OF ENGINEERING, PROFESSOR, 工学部, 教授 (80113033)
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| Co-Investigator(Kenkyū-buntansha) |
KIMPARA Isao KANAZAWA INSTITUTE OF TECHNOLOGY, COLLEGE OF ENGINEERING, PROFESSOR, 工学部, 教授 (50011101)
NAKADA Masayuki KANAZAWA INSTITUTE OF TECHNOLOGY, COLLEGE OF ENGINEERING, ASSOCIATE PROFESSOR, 工学部, 助教授 (00247438)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2005: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2004: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | CARBON FIBER REINFORCED PLASTICS / LIFE PREDICTION / ACCELERATED TESTING / FRCTURE MECHANISM / TIME-TEMPERATURE SUPERPOSITION PRINCIPLE / TENSILE STRENGTH / COMPRESSIVE STRENGTH |
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| Research Abstract |
The stress-strain relation of polymer resin exhibits time and temperature dependence, called viscoelastic behavior, not only above the glass-transition temperature T_g but also below T_g. Thus, it can be presumed that the mechanical behavior of polymer composites also depends on time and temperature even below T_g which is within the normal operating-temperature range. We have proposed the accelerated testing methodology to predict the fatigue life of polymer composites under an arbitrary combination of frequency, temperature, and stress ratio based on the time-temperature superposition principle and discussed experimentally about the validity and applicability of our proposed method. It has been clarified from these studies that our proposed method is applicable to predict the fatigue life of all loading directions for all kinds of CFRP laminates using PAN-based carbon fiber and epoxy resin.
In this project, the applicability of our methodology was theoretically confirmed for the longitudinal and transverse tensile and compressive static strength of unidirectional CFRP laminates from the viewpoint of fracture mechanism. As results, the mechanical model of fracture mechanism was successfully constructed and it was theoretically and experimentally indicated that the time-temperature superposition principle holds for these strengths.
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