2003 Fiscal Year Final Research Report Summary
Numerical simulation of fatigue crack growth in steel structures
| Project/Area Number |
13450410
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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 |
海洋工学
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| Research Institution | Kyushu University |
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Principal Investigator |
TOYOSADA Masahiro Kyushu University, Faculty of Engineering, Prof., 工学研究院, 教授 (30188817)
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| Co-Investigator(Kenkyū-buntansha) |
GOTOH Koji Kyushu University, Faculty of Engineering, Assoc.Prof., 工学研究院, 助教授 (60274487)
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| Project Period (FY) |
2001 – 2003
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| Keywords | Fatigue / S-N curves / Fatigue crack growth curves / In-service loading / Numerical simulation of crack growth / Corrosion fatigue / Estimation of the stress distribution alone plate thickness direction / Fatigue crack initiation |
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| Research Abstract |
In order to recover the insufficient ability of S-N curves for the evaluation of fatigue strength in the welded built-up steel structures, e.g.ship, offshore structures and bridges, a new fatigue strength evaluation procedure based on the numerical simulation of the, fatigue crack growth(initiation and propagation) is developed by this research project.
Detailed project items are as follows
1.An algorithm to perform the numerical simulation of the fatigue crack growth is proposed.
2.An numerical model for the fatigue crack initiation from the sound(zero defect) stress concentration field is constructed by considering the dislocation theory.
3.Some numerical simulations are performed and the results are compared with the experimental results in order to verify the algorithm.
4.An algorithm for the corrosion fatigue is proposed.
5.The conventional estimation method of stress distributions in the plate thickness is proposed.
Calculation results of the FE analysis by shell type element is the input data of this method.
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