http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
API 5LB鋼管의 高周波電氣抵抗熔接部에 관한 破壞靱性 評價
吳世旭(Sae-Wook Oh),尹漢基(Han-Gi Yoon),安啓元(Kye-Won Ahn) 한국해양공학회 1987 韓國海洋工學會誌 Vol.1 No.1
The evaluation of the elastic-plastic fracture toughness J1C was performed on the center of weld metal (CWM), the heat affected zone (HAZ) and the base metal (BM) of API 5LB steel pipes welded by the high frequency electric resistance welding. The J1C was evaluated by the JSME R-Curve and JSME SZW methods using the smooth and side-grooved specimens.<br/> The results are as follows;<br/> (1) The J1C values by the SZW method are overestimated as compared with those by the R-curve method. because the micro-crack is formed as SZW increase with the deformation at SZ after initiation of the ductile crack.<br/> (2) The average of J1C values by the R-curve and the SZW methods in side-grooved specimens tended to decrease in comparison with smooth specimens 9.42% at CWM, 4.2% at HAZ, 23.2% at BM, respectively.<br/> (3) The boundary of the fatigue pre-crack, stretched zone, and dimple regions appeared more clearly in side-grooved specimens, for the slight change of SZW in the direction of the plate thickness, as compared with smooth specimens.