Experimental evaluation of the short and long fatigue crack growth rate of S355 structural steel offshore monopile weldments in air and synthetic seawater

被引:2
作者
Saeed, Hasan [1 ]
Chaudhuri, Somsubhro [1 ,2 ]
De Waele, Wim [1 ]
机构
[1] Univ Ghent, Fac Engn & Architecture, Dept Electromech Syst & Met Engn EMSME, Soete Lab, Technol Pk 46, B-9052 Zwijnaarde, Belgium
[2] Bundesanstalt Mat Forsch & Prufung BAM, Berlin, Germany
关键词
Fatigue crack growth rate; Short crack; Corrosion fatigue; Welded joints; Heat-affected zone (HAZ); Offshore monopile foundation; CORROSION-FATIGUE; BEHAVIOR; STRENGTH; PROPAGATION;
D O I
10.1016/j.apor.2024.104063
中图分类号
P75 [海洋工程];
学科分类号
0814 ; 081505 ; 0824 ; 082401 ;
摘要
Welded steel structures used in the offshore wind industry are exposed to harsh marine environments, which can result in corrosion-induced fatigue damage. Of particular concern is the heat affected zone (HAZ) of welded joints, a region known for its altered microstructure and mechanical properties, which can significantly influence the initiation and propagation of fatigue cracks. This study investigates the short and long fatigue crack growth rates, and the effect of seawater exposure, for the HAZ in S355 steel weldments. Single-edge notch bend (SENB) specimens are used, with a shallow notch in the HAZ. A series of specimens is immersed in synthetic seawater that is continuously circulated at a controlled temperature to assess the synergistic effects of corrosion and fatigue. The experimental method integrates a novel application of front face strain compliance for monitoring short cracks, alongside an extended back-face strain compliance approach for monitoring long crack propagation. It is concluded that the short fatigue crack growth rate of the HAZ is 2.7 to 3.5 times higher in seawater as compared to air. As the crack propagates and enters into the long crack regime, the ratio decreases to 2.2 times at the transition point of the two-stage crack growth curve and further decreases to 1.5 times when the notch advances towards fracture. The findings indicate that the fatigue crack growth rates documented in standards tend to be on the conservative side. This study significantly enriches the fatigue crack growth data available in literature, which will contribute to a more accurate lifetime assessment offshore wind turbine structures.
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页数:17
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