| Project/Area Number |
10555028
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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 | 展開研究 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Nagoya University |
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Principal Investigator |
AKINIWA Yoshiaki Nagoya Univ., Grad.School of Eng., Assoc.Professor, 工学研究科, 助教授 (00212431)
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| Co-Investigator(Kenkyū-buntansha) |
KATAYAMA Tyuji Mac Science Ltd., Researcher, 研究員
TANAKA Hiroshi Nagoya Univ., Res.Center for Adv.Waste. and Emis.Manage., Assistant Professor, 難処理人工物研究センター, 講師 (80236629)
TANAKA Keisuke Nagoya Univ., Grad.School of Eng., Professor, 工学研究科, 教授 (80026244)
ADACHI Shuhei Yamaha Motor Co.Ltd., R & D div., Researcher, 技術本部・研究員
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥12,100,000 (Direct Cost: ¥12,100,000)
Fiscal Year 2000: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1999: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1998: ¥9,600,000 (Direct Cost: ¥9,600,000)
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| Keywords | Metal matrix composite / Fatigue / Crack initiation / X-ray stress measurement / Residual stress / Fracture mechanics / Mezo mechanics |
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| Research Abstract |
1). Fatigue process in SiC particulate reinforced aluminum alloy was investigated. For the case of fine particle-reinforced composites, crack initiation was associated with matrix slip in a particle-rich region. The crack is decelerated when it hits the particle. When the crack becomes longer than about 150 μm, the crack does not show large irregularity in the crack growth curve. On the other hand, for the case of coarse particle-reinforced composites, cracks were mainly initiated by particle cracking under cyclic loading. A main crack propagated with coalescence with sub-cracks initiated from particle fracture ahead of a main crack.
2). A new detective system of fatigue damage of metal matrix composite by X-ray diffraction was developed. The irradiated area could be focused within φ0.5mm. Stress distribution near the notch root could be measured by the system. The experimental data agreed well with the analytical value calculated by FEM.
3). The compressive residual stress in both phases increased with stress cycles. On the other hand, phase stresses at the maximum applied stress decreased with stress cycles due to the debonding of the interface between the matrix and the particle. Fatigue damage could be evaluated by the phase stresses.
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