Flow-field stress intensity exceeds simple pressure load at defect

01/06/2014
Yue Cui Hui-qing Lan Beijing Jiaotong University Ren-yang He China Special Equipment Inspection and Research Institute Chao-hui Zhang Beijing Jiaotong University Beijing Analysis of the residual fatigue life of X70-grade pipeline steel with a semi-ellipse defect shows the maximum stress intensity factor under the influence of the flow field to be higher than the value under a simple pressure load at the defect site. The flow field influences stress distribution at the inner wall of the pipe, but changes in concentrated stress advanced by the flow are not obvious at the defect's narrow flow path. Increasing defect length to 30 mm from 10 mm in the axial direction decreases the residual fat...
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