Effects of Fatigue Parameters on Fatigue Crack Growth Rate of Pipe Steels and Girth Weld

被引:1
作者
Park, Dong-Yeob [1 ]
Liang, Jie [2 ]
机构
[1] Nat Resources Canada, CanmetMAT, 3303-33 St NW, Calgary, AB T2L 2A7, Canada
[2] Nat Resources Canada, CanmetMAT, 183 Longwood Rd South, Hamilton, ON L8P 0A5, Canada
来源
JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME | 2024年 / 146卷 / 03期
关键词
STRESS RATIO; LOAD RATIO; ALUMINUM-ALLOYS; CLOSURE; BEHAVIOR; PROPAGATION; FREQUENCY; RANGE; LAW;
D O I
10.1115/1.4065135
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Oil and gas pipeline steels and welds are subjected to a wide variety of cyclic loadings: internal pressure variation, pulsation of gas pressure resulting from the cyclic operation of a reciprocating compressor at a gas compressor station, internal flow-induced vibration resulting from the turbulent flow within the pipe, vortex-induced vibration of a free-spanning section exposed to air (wind) for aboveground pipelines or water for water-crossing pipelines, and cyclic thermal stresses developed by significant changes in temperature due to seasonal changes or changes in operating temperatures. These cyclic loadings are very variable and complex. Considering the fatigue situations, a better understanding of the effects of fatigue test parameters on fatigue behaviors of pipeline steels and welds is required. Hence, in this study, the influences of fatigue test parameters on the Paris law coefficients were studied for pipeline steels and welds. It was analyzed for pipe steels of X65 similar to X100 and a girth weld of X70. Influences of material strength, crack orientation relative to the pipe axis, and frequency in the range of 1 similar to 30 Hz were insignificant. It was found that the coefficients a(1) and b(2) of the m-ln(C) relationships linearly relied on the load ratio. The constants (alpha(1), beta(1), alpha(2), and beta(2)) of these linear relationships between R-ratio and a(1) (and b(2)) were determined for pipe steels.
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页数:10
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