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Evaluation of Fatigue Crack Growth Characteristics Considering Crack Closure Phenomenon in Weldment of Multi-Pass Welded Pipe
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 Title & Authors
Evaluation of Fatigue Crack Growth Characteristics Considering Crack Closure Phenomenon in Weldment of Multi-Pass Welded Pipe
Kim, Cheol-Han; Jo, Seon-Yeong; Bae, Dong-Ho;
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To obtain representative fatigue crack growth characteristic curve in residual stress field, fatigue crack growth test was carried out at various stress ratio and fatigue crack growth characteristic curve was represented using crack closure concept. Obtained results are as follows;K(sub)op/K(sub)max was independent of K(sub)max when R was lower than 0.5 and crack closure phenomenon was not observed when R is higher than 0.5. therefore neglecting crack closure behaviour, actual fatigue crack growth rate can be underestimated. Thus, considering crack closure phenomenon, fatigue crack growth characteristics curve of A 106 Gr B Steel weldment can be effectively estimated.
Welding Residual Stress;Crack Closure;Crack Opening Point;Stress Intensity Factor by Welding Residual Stress;Effective Stress Intensity Factor Range;K;
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SWS 490B와 Al 7075-T6 합금의 피로균열 열림 및 닫힘시 음향방출 특성 분석,윤동진;정충재;이승석;원창환;

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