| Project/Area Number |
08555030
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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 | Nakanihon Automotive College |
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Principal Investigator |
KO Haeng-Nam Nakanihon Automotive College, Professor, 自動車工業科, 教授 (80141399)
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| Co-Investigator(Kenkyū-buntansha) |
OTSUKA Akio Nagoya University, Professor Emeritus, 工学部, 名誉教授 (60022993)
OGAWA Takeshi Aoyama Gakuin University, Associate Professor, 理工学部, 助教授 (50167318)
KATOH Yasuo Nakanihon Automotive College, Lecturer, 自動車工業科, 講師 (90259292)
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| Project Period (FY) |
1996 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥4,800,000 (Direct Cost: ¥4,800,000)
Fiscal Year 1998: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1997: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1996: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | Rolling contact fatigue / Flaking failure / Mode II fatigue / Testing method for fatigue crack / Ceramics / Aluminum alloy / High tensile strength steel |
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| Research Abstract |
Flaking failure is the most common type of failure in rolling contact fatigue. It is supposed that this type of failure is caused by the subsurface crack growth under the contact surface, and that this subsurface crack growth is mode II fatigue crack growth under superimposed compression stress.
The testing apparatus was developed based on the idea mentioned above. The specimen used is a 15 mm*80 mm and 2 mm thick plate with a side notch, having mode I precrack. Mode II fatigue crack growth tests are carried out according to the following procedure. Firstly, the both sides of the specimen are clamped to the mode II loading device, By this clamping, the static compressive stress parallel to the crack plane is applied. Then, the static K_I of some small amount is applied in order to prevent the friction between mating fracture surfaces during mode II loading. After that, cyclic mode II loading applied through the four-point-shear loading system by fatigue testing machine.
Mode II fatigue crack growth characteristics of aluminum alloy 2017-T3 has been investigated, and the reliability of the newly developed testing apparatus has been confirmed by comparing with the reported results. The superimposed static compression stress parallel to the crack plane seemed to have no effect on the mode II fatigue crack growth behavior. It has also been confirmed that mode II fatigue crack growth occurs in high tensile strength steel HT6O under mode II loading with superimposed compression stress field.
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