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| EFFECT OF INTERMITTENT OVERLOAD ON CORROSIN FATIGUE CRACK GROWTH OF A537 OFFSHORE STRUCTURAL STEEL |
| Zang Qishan Liu Kang (Institute of Metal Research; Academia Sinica) Ke Wei and Zheng Yili (Institute of Corrosion and Protection of Metals; Academia Sinica) |
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Abstract It is believed that an overload may have significant influence on fatigue crack growth in air, but what influence it would have on corrosion fatigue crack growth in sea water was seldom reported. In this paper, the intermittent overload which simulated a sltuation that a number of small wave loads follow a big wave overload was investigated to see what would happen to the cracks in critical position, such as undercuts in weld toe or inherent defects in base metal for offshore structures. The results showed that in 3.5％ NaCl solution the overload effect on fatigue crack growth was still active, but the retardation effect of a single overload in tension was less than that in air. The reason for this may be very complex, which related to the dissolution reaction, solution pumping action as well as the effect of corrosion products. It was also found that there was little difference between the crack growth rates in 3.5％ NaCl solution when the overload ratio changed from 1.5 to 2. Fractographic observations of some specimens from SEM showed that high plastic strain appeared in the overload band and secondary cracks were found near those high strain areas.
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Received: 25 June 1989
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Cite this article:
Zang Qishan Liu Kang (Institute of Metal Research; Academia Sinica) Ke Wei and Zheng Yili (Institute of Corrosion and Protection of Metals; Academia Sinica). EFFECT OF INTERMITTENT OVERLOAD ON CORROSIN FATIGUE CRACK GROWTH OF A537 OFFSHORE STRUCTURAL STEEL. J Chin Soc Corr Pro, 1989, 9(3): 169-175.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1989/V9/I3/169
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