\r余建星^{1, 2}，金成行^{1, 2}，王华昆^{1, 2}，余 杨^{1, 2}，王昭宇^{1, 2}，谭玉娜\r^{1, 2}\r
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AuthorsHTML:\r余建星^{1, 2}，金成行^{1, 2}，王华昆^{1, 2}，余 杨^{1, 2}，王昭宇^{1, 2}，谭玉娜\r^{1, 2}\r
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AuthorsListE:\rYu Jianxing^{1, 2}，Jin Chenghang^{1, 2}，Wang Huakun^{1, 2}，Yu Yang^{1, 2}，Wang Zhaoyu^{1, 2}，Tan Yuna\r^{1, 2}\r
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AuthorsHTMLE:\rYu Jianxing^{1, 2}，Jin Chenghang^{1, 2}，Wang Huakun^{1, 2}，Yu Yang^{1, 2}，Wang Zhaoyu^{1, 2}，Tan Yuna\r^{1, 2}\r
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Unit:\r1. 水利工程仿真与安全国家重点实验室(天津大学)，天津 300072；
2. 高新船舶与深海开发装备协同创新中心，上海 200240\r
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Unit_EngLish:\r1. State Key Laboratory of Hydraulic Engineering Simulation and Safety(Tianjin University)，Tianjin 300072，China；
2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration，Shanghai 200240，China\r
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Abstract_Chinese:\r\r针对深海油气输送管道中含冲刷腐蚀损伤的\r90°\r弯管的屈曲问题，建立了一种更符合实际损伤的简化模型，得到了冲刷腐蚀屈曲类型分布图，提出了一个按不同分类屈曲形式计算含冲刷腐蚀损伤的\r90°\r弯管屈曲压力的显式经验表达式．根据试验数据，建立了含冲刷腐蚀损伤的\r90°\r弯管的原尺寸模型，通过用户自定义\rPython\r程序实现自主调整冲刷腐蚀的损伤参数\r(\r轴向范围、周向宽度、径向深度\r)\r及管道几何参数\r(\r椭圆度、径厚比和腐蚀比\r)\r．通过将自定义程序嵌入\rAbaqus\r有限元软件，建立了冲刷腐蚀简化模型，开展系统的敏感性分析．分析表明，径向最大腐蚀深度会限制轴向范围影响和周向宽度影响程度，且径向最大腐蚀深度和冲刷腐蚀轴向范围会影响弯管模型的屈曲类型，出现了\r3\r种屈曲模态，研究表明不同的损伤参数导致\r3\r种不同屈曲模态：\r①\rA\r类屈曲，弯管端部及其附加直管部位率先发生屈曲；\r②\rB\r类屈曲，冲刷腐蚀最大深度截面的环向\r\rφ\r\r＝\r45°\r处率先发生屈曲；\r③\rC\r类屈曲，冲刷腐蚀最大深度处率先发生屈曲．依据屈曲类型划分出冲刷腐蚀屈曲类型分布图．根据数值模拟和敏感性分析结果，结合多参数非线性回归分析\r，\r建立了无量纲屈曲压力\r\rp\r\r_\rc\r\r/p_y\r和椭圆度\r\rD\r\r、径厚比\r\ra\r\r、弯径比\r\rl\r\r、无量纲腐蚀深度\r\rD\r\r_\re,m\r\r/t\r、腐蚀比\r\ra \r\r之间的经验公式．本文的研究结果可为冲刷腐蚀作用下的海底油气输送弯管的屈曲强度评估提供 依据．\r
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Abstract_English:\r\rConsidering the influence of erosional corrosion damage on the buckling pressure of the oil and gas 90° elbow\r，\rthis paper proposes a simplified model that is more suitable for actual damage\r，\rand the scour corrosion buckling-type diagram is divided\r．\rThis paper presents an explicit expression for calculating buckling pressure by classifying buckling forms\r．\rAccording to the relevant experimental data\r，\rthe original size model of the 90° elbow with erosional corrosion damage was established\r．\rUsers could independently adjust the axial range\r，\rcircumferential width\r，\rand radial depth of erosional corrosion\r，\ras well as the ovality\r，\rradial/thickness ratio\r，\rand corrosion ratio of the elbow\r．\rUsing \rthe FE software Abaqus\r，\ra simplified model of elbow with erosional corrosion was established\r，\rand a series of sensitivity analyses were carried out\r．\rThe analysis showed that the maximum radial corrosion depth affected the upper limit of the influence of the axial range and the circumferential width\r，\rand the maximum corrosion depth and axial extent of the erosional corrosion affected the buckling type of the 90° elbow with erosional corrosion damage\r．\rThere were three types of buckling\r：\r① \rA-type buckling\r，\rwherein the end of the elbow and the additional straight pipe were the first to buckle\r；\r② \rB-type buckling\r，\rwherein buckling occurred first in the annular direction \r\rφ\r\r＝\r45° \rof the section with the maximum erosion depth\r；\r③ \rC-type buckling\r，\rwhich occurred first at the maximum depth of erosional corrosion\r．\rAccording to the buckling type\r，\rthe scour corrosion buckling type diagram was divided\r．\rBased on the results of numerical simulation and sensitivity analysis\r，\ran empirical formula between dimensionless buckling pressure p_c/p_y and ovality \r\rD\r\r，\rradial/thickness ratio \r\rα\r\r，\rradial/diameter ratio \r\rl\r\r，\rdimensionless corrosion depth D_e,m/t\r，\rand corrosion ratio \r\rα\r\r was established\r，\rbased on multi-parameter nonlinear regression \ranalysis\r．\rThe results of this paper can be used to evaluate the buckling strength of submarine oil and gas transportation elbows undergoing erosional corrosion\r．\r\r
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Keyword_Chinese:冲刷腐蚀；90°弯管；屈曲压力；数值模拟\r

Keywords_English:erosion corrosion；90° elbow；buckling pressure；numerical simulation\r


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