| Project/Area Number |
16360335
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Composite materials/Physical properties
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| Research Institution | Yamagata University |
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Principal Investigator |
KURIYAMA Takashi Yamagata University, Venture Business Laboratory, Professor, 大学院・ベンチャービジネスラボラトリー, 教授 (10186520)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥12,700,000 (Direct Cost: ¥12,700,000)
Fiscal Year 2006: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2005: ¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 2004: ¥5,700,000 (Direct Cost: ¥5,700,000)
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| Keywords | Fatigue / Acoustic emission / Map of acoustic velocity / Fiber brakeage / Matrix crakes / 複合材料 / 樹脂破壊 / 線形加算則 / クリープ / 結晶化度 / ポリアミド |
|---|
| Research Abstract |
The ability to effectively design and manufacture plastics for engineering applications requires a large body of knowledge on long-term performance of the materials. The fatigue life is a typical long-term property that should be characterized in components and structures where cyclic loads are experienced. There has been considerable research into the basic mechanism that cause fatigue of plastics, but still there is not a clear understanding of the mechanism in many plastics. In this study, the mechanism of the fatigue fracture of glass fiber reinforced nylon66 has been identified using acoustic emission (AE), ultrasonic measurement and optical microscopy (OM) techniques. The acoustic velocity of the edge of specimens decreased by the cyclic loading. This behavior was correlated to matrix cracks and fiber breakages at the edge of the specimens.
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