2018 Fiscal Year Final Research Report
Repairing Method for Fatigue Cracks Generated by Out-of-plane Bending Stresses
| Project/Area Number |
16H04396
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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 |
Structural engineering/Earthquake engineering/Maintenance management engineering
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| Research Institution | Nagoya University |
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Principal Investigator |
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Keywords | 疲労 / 面外曲げ |
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| Outline of Final Research Achievements |
This study investigated a prediction method of fatigue crack growth behavior generated by cyclic out-of-plane bending stresses and shear stresses. First, the crack fracture surface was obtained in bending fatigue tests for bead-on-plate specimens. Then, finite element analyses were conducted in order to obtain the stress conditions around the crack front. Bending stress, membrane stress and shear stress obtained by the FEA were used for parametric studies with 2D model. Consequently, the crack growth behavior under plate bending can be simulated by simple 2D analysis. Besides, it is demonstrated fatigue crack growth can be drastically reduced by attaching CFRP sheets on the crack surface.
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| Free Research Field |
鋼構造学
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| Academic Significance and Societal Importance of the Research Achievements |
面外曲げ応力によって発生する疲労き裂は，これまでに事例の多い損傷であるにも関わらず，その進展挙動は複雑であり，未解明な点が多い．本研究において，実際の3次元的なき裂の進展挙動を2次元解析で再現することに成功した．これにより，き裂進展シミュレーションが格段に容易に行うことができるようになり，さまざまな要因に支配されるき裂の進展挙動を解析的に予測するための道具が整った．
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