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The behaviour of strength and fatigue crack propagation of various steels in steel bridges
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 Title & Authors
The behaviour of strength and fatigue crack propagation of various steels in steel bridges
Han, Seung-Ho; Kim, Jung-Kyu;
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 Abstract
The residual safety assessment of steel structures, an important subject in practice, is given to much attention. Life prediction in the planning course of steel structures under fatigue loading is mainly based on fatigue design criteria resulting from S-N curves. But for any reason cracks have to be assumed due to fabrication failures or fatigue loading in service which can lead total fracture of structures. The life prediction can be carried out by means of fracture mechanics using Paris-Erdogan equation(). The paper presents results from charpy test to interpret transition behaviour of charpy energy() in a wide temperature range and from constant-load-amplitude test to measure fatigue crack growth of various steels widely used in steel bridges since beginning of 20 centuries in Europe. In the normal service temperature range of steel bridges, the steel S355M shows higher maximum charpy energy() and lower transition temperature() than other steels considered. The C and m of Paris-Erdogan equation on the steels appear to be correlated, and to be affected by the R-ratios due to crack closure, especially at a low fatigue crack growth rate. Scanning electron microscopy analysis was carried out to interpret an influence of the crack closure effects on the correlation of C and m.
 Keywords
Residual Safety Assessment;Life Prediction;Fatigue Design Criteria;Charpy Energy;Fatigue Crack Propagation;Crack Closure;
 Language
Korean
 Cited by
1.
구조용 내화강의 기계적 성질과 피로균열전파 특성에 관한 연구,김현수;남기우;강창룡;

대한기계학회논문집A, 2001. vol.25. 1, pp.54-60 crossref(new window)
2.
구조용 압연강재와 스테인리스 강재의 MIG 용접에 대한 기계적 특성연구,임종영;윤명진;김상윤;김태규;

한국기계가공학회지, 2014. vol.13. 1, pp.100-106 crossref(new window)
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