X80鋼隔水管焊接接頭疲勞性能研究
[Abstract]:As a very important part of deep-sea oil and gas exploration and development, the safety of drilling risers is the most important part of the current research on risers. Therefore, in order to ensure that offshore drilling risers do not fail due to fatigue fracture during their planned lifetime, It is very important to analyze the fatigue performance of drilling riser, and X80 pipeline steel is due to its high strength and toughness. Corrosion resistance is widely used in the construction of riser. The welded joint of riser formed by steel .X80 is regarded as the most vulnerable place in the whole welding component, and the high fatigue strength is the guarantee of the normal operation of the whole riser. In this paper, the fatigue test and numerical simulation of welded joints are carried out on the X80 steel riser pipe to investigate the fatigue properties of welded joints, fatigue influencing factors and ways to improve their fatigue properties. The microstructure and mechanical properties of welded joints were analyzed by means of ultrasonic shock stress relief equipment, electro-hydraulic servo fatigue testing machine, optical microscope (OM) KJ3-3 indentation stress tester, scanning electron microscope (SEM) and microhardness tester. At the same time, the life of welded joints is simulated by finite element analysis software ANSYS Workbench, and the fatigue properties of welded joints of different forms are analyzed. The results show that there is stress concentration in the toe of welded joint, and fatigue fracture is easy to occur. The fatigue life of welded joint can be improved by 4 ~ 6 times after removing the remaining height, and the surface morphology of weld toe can be improved by ultrasonic impact treatment. The smooth transition can also refine the surface grain, increase the hardness of the surface layer, eliminate the residual tensile stress, produce effective compressive stress, reduce the stress concentration of the welded joint and increase the fatigue life. The simulation results of fatigue properties of welded joints show that ultrasonic impact and removal of residual height can improve the fatigue life of welded joints, and the effect of removing residual high is better than that of ultrasonic impact, without considering the influence of residual stress, the fatigue life of welded joints can be improved by ultrasonic impact. The fatigue properties of welded joints formed by double-sided symmetrical groove are the most excellent. The U-type groove is better than the V-shaped groove, and the stress concentration factor of welded joint decreases with the increase of groove angle. The stress concentration factor of welded joints increases with the increase of toe inclination angle, and the fatigue life decreases with the increase of toe inclination angle.
【學(xué)位授予單位】:中國(guó)石油大學(xué)(華東)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類(lèi)號(hào)】:TE95;TG407
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