| Project/Area Number |
07651131
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
船舶工学
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| Research Institution | Yokohama National University |
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Principal Investigator |
ISHIZUKA Tetsuo Yokohama National University, Faculty of Engineering, Lecturer, 工学部, 講師 (50017927)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1996: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1995: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Fatigue Crack / Crack Growth Rate / Stress Intensity Factor / K Control / 疲労き裂伝播 / き裂伝播速度 / 疲労試験法 |
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| Research Abstract |
Generally, fatigue is known as the main cause of structural failures. Fatigue crack growth rate is random due to various factors.
The investigation was carried out taking into account the main factors that are believed to most affect fatigue crack propagation in steels, namely specimen width W,aspect ratio a/W,and the stress ratio R.Experimental tests were conducted with CT (compact tension) specimens made of BS4360 steel under constant DELTAK level. Two dimensional elastic-plastic analysis using finite element method were also performed.
This study (both tests and calculations) demonstrated that :
(1) Fatigue crack growth rate is accelerated by decreased specimen width.
(2) Fatigue crack growth rate is increased marginally at high aspect rations.
(3) Fatigue crack growth rate is accelerated by stress ratio.
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