海洋井架腐蚀后力学强度及疲劳性能研究
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1.西南石油大学机电工程学院;2.中国石油集团川庆钻探工程有限公司

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O346.21

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Study on Mechanical Strength and Fatigue Performance of Offshore Derricks after Corrosion
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College of Mechanical and Electrical Engineering, Southwest Petroleum University

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    摘要:

    海洋石油井架长期处于高盐、多负载环境,易发生腐蚀疲劳破坏,严重影响使用寿命。目前关于海洋井架腐蚀疲劳研究尚未有明确定论,据此对井架常用钢材Q345B钢开展加速腐蚀、拉伸及高周疲劳试验,分析探讨不同腐蚀周期试件形貌变化、力学强度和断裂规律,并拟合不同腐蚀周期试件的S-N曲线。结果表明:随着腐蚀时间增加,试件表面腐蚀坑数量增多、体积增大、粗糙度增加;对比真实海洋环境和实验的腐蚀动力学模型,二者具有较好相似性,且实验腐蚀的平均速度为海洋腐蚀的15.96倍;21天腐蚀时间内,腐蚀对试件的屈服强度和抗拉强度影响小;考虑了材料疲劳性能随腐蚀时间的变化,建立的Q345B钢腐蚀后疲劳S-N模型较传统模型更适合海洋井架的工作环境,对于海洋井架腐蚀疲劳寿命评价具有参考意义。

    Abstract:

    Offshore oil derricks’ service life is significantly impacted by high salt and multiple loads, which can lead to corrosion fatigue damage. However, there is no clear conclusion about the corrosion and fatigue research on the marine derrick. Therefore, tests for accelerated corrosion, tensile strength, and high-frequency fatigue were conducted on Q345B steel, which is frequently used for derricks. The morphology change, mechanical strength, and fracture law of specimens with different corrosion cycles were analyzed and explored, and the S-N curves of specimens were fitted. The results show that the specimen's surface corrosion pit number, volume, and surface roughness increase with corrosion time. Additionally, there is a good degree of resemblance between the corrosion kinetic models of the real maritime environment and the experimental corrosion, and the average speed of experimental corrosion is 15.96 times that of marine corrosion. Meanwhile, the corrosion has a small effect on the specimen's yield and tensile strength within the corrosion time of 21 days. Last, considering the change in material fatigue performance with corrosion time, the established post-corrosion fatigue S-N model of Q345B steel is more appropriate for the offshore derrick working environment than the traditional model, which is of reference significance for the evaluation of the corrosion fatigue life of offshore derrick.

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曾浪,蔡灿,廖飞龙,等. 海洋井架腐蚀后力学强度及疲劳性能研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-09-26
  • 最后修改日期:2024-05-24
  • 录用日期:2024-05-29
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