| Project/Area Number |
11450047
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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 |
Materials/Mechanics of materials
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| Research Institution | Kyushu University |
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Principal Investigator |
MURAKAMI Yukitaka Graduate school of Engineering, Kyushu University, Professor, 大学院・工学研究院, 教授 (10038010)
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| Co-Investigator(Kenkyū-buntansha) |
FUKUSHIMA Yoshihiro Graduate school of Engineering, Kyushu University, Research Assistant, 大学院・工学研究院, 助手 (40156774)
SAKAE Chu Graduate school of Engineering, Kyushu University, Assistant Professor, 大学院・工学研究院, 助教授 (00253477)
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| Project Period (FY) |
1999 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥13,600,000 (Direct Cost: ¥13,600,000)
Fiscal Year 2001: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2000: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1999: ¥9,300,000 (Direct Cost: ¥9,300,000)
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| Keywords | Mode II fatigue crack growth / Very hard steel / Stress intensity factor / Mode II threshold stress intensity factor range / Tribology / Fractography / Friction / 【square root】area parameter model / 高強度網 / モードII型き裂展下限界値 / モードII型疲労き裂 / モードIII型疲労き裂 / ΔK_<IIth> / ファクトリールーフ / HV / モードIIき裂 / モードIIIき裂 / 疲労き裂進展下限界値 / レール鋼 / ロール鋼 / 軸受鋼 / き裂先端特異性 |
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| Research Abstract |
Mode II fatigue crack growth rate and Mode II threshold stress intensity factor range for the various materials were measured by using the newly developed testing system designed by head investigator.
The crack in spalling failure of steel making backup rolls : BUR propagates mostly in Mode II. The Mode II fatigue crack fracture surface morphology of the specimen was very similar to that of an actual BUR. The crack growth behavior of the fractured BUR was investigated based on fracture mechanics by using the laboratory test data of Δ K_<II^<th>> for the BUR. The analysis showed the guideline to prevent the spalling of the BUR in designing process.
The fatigue crack growth behavior under mode II and III loadings was studied on a 0.47 % carbon steel. Change in microstructure occurred at the crack tip in the process of crack growth both in mode II and III shear cracks. It is presumed that the crack growth mechanism of the mode II and that of the mode III are essentially the same.
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