实例分析 API 5L X52 t > 360 槡 D D o = mm t =10.30mm σ s = 358MPa σ b = 455MPa ρ =7 850kg/m 3 s > 2 槡 Dt E =206GPa μ = l nm = l m

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1 505 含相互作用缺陷海洋立管极限载荷数值分析 姜 峰 ** 曹鑫周涛 摘要对含相互作用缺陷的海洋立管极限载荷进行分析, 考虑了相邻缺陷间轴向距离对含缺陷管道 极限载荷的影响, 由于材料和缺陷尺寸的非线性, 采用有限元分析软件 ANSYS 进行分析计算, 得到管道 极限载荷与缺陷尺寸和距离的关系曲线, 研究表明相邻缺陷间轴向距离对缺陷管线的影响较大, 特别是 当缺陷间距离较近时结果与国内外相关的海洋管道腐蚀缺陷评价标准中的规定是一致的, 证明含相 互作用缺陷海洋立管极限载荷的分析计算采用有限元非线性分析是可行的 关键词海洋管道相邻缺陷极限载荷非线性数值分析 中图分类号 TQ 文献标识码 A 文章编号 SY /T PARLOC 1 42% 1 管道极限载荷的分析方法 DNV- RP-F * * **

2 实例分析 API 5L X52 t > 360 槡 D D o = mm t =10.30mm σ s = 358MPa σ b = 455MPa ρ =7 850kg/m 3 s > 2 槡 Dt E =206GPa μ = l nm = l m + m - 1 l i + s i 1 i = n 7 m i = nd i l i d nm = n m = 1 2 N 2 l nm 8 d nm mm l nm mm 4 1 /2 25mm 9 25mm 2 ~ t 1. 0t 1. 5t 2. 0t 2. 5t 3. 0t mm 80mm 0. 2t 0. 4t 0. 6t 0. 8t Bin Fu Mike G Kirkwood Von-Mises 1 σ eq = 槡 2 σ 1 - σ σ 2 - σ σ 3 - σ σ 1 σ 2 σ 3 3 图 1 含相互作用缺陷管道模型 2. 2 Von- Mises

3 507 ANSYS 0. 5t 1. 0t 1. 5t 2. 0t 2. 5t 3. 0t 10 ~ Von-Mises t 图 2 相互作用缺陷应力分布 mm 3 管道极限载荷分析 13 图 4 极限载荷随缺陷距离变化曲线 t mm 2. 5t mm t 0. 5t 1. 0t 1. 5t 2. 0t 2. 5t 3. 0t 5 60mm 60mm 3. 2 图 3 极限载荷随缺陷深度变化曲线

4 mm 图 5 极限载荷随缺陷长度变化曲线 图 7 极限载荷随缺陷深度变化曲线 mm 0. 2t 0. 4t 0. 6t 0. 8t 结论 t 0. 4t 0. 6t 0. 8t t 25mm 4. 3 图 6 极限载荷随缺陷长度变化曲线 ANSYS 参 考 文 献 1 PARLOC 2001 The Update of Loss of Containment 7 Data for Offshore Pipelines R. Prepared by Mott

5 509 MacDonald Ltd. for The Health and Safety Executive The UK Offshore Operators Association and The Institute of Petroleum M. J ~ DNV-RP-F101 Corroded Pipeline S. Oslo DET NOR- SKE VERITAS SY /T 6151 S GB /T S Bin Fu Mike G Kirkwood. Predicting Failure Pressure of Internally Corroded Pipeline Using the Finite Element Method C. ASME OMAE 13th International Conference of Mechanic Arctic Engineering. Houston ASME ~ M ~ 388. Abstract ~ J ~ ANSYS M ANSYS Workbench M ANSYS M. 13 Liang R Zhou T Cao X et al. Numerical Analysis of Ultimate Load for a Marine Riser Containing Corrosion Defects C. Proceedings of 2012 International Symposium on Structural Integrity-from Failure to Better Design Manufacture and Construction. Shanghai East China University of Science and Technology Numerical Analysis of Ultimate Load for Marine Riser with Interacting Defects JIANG Feng CAO Xin ZHOU Tao School of Petrochemical Engineering Lanzhou University of Technology Lanzhou Gansu The ultimate load of marine riser with interacting defects was analyzed including the effect of adjacent defects axial distance on the riser s ultimate load and considering the nonlinearity of the riser s material and defects size and through ANSYS the relation curves of the ultimate load defect sizes and distance were obtained. The research results show that the effect of adjacent defects axial distance is obvious especially at the time that the distance between defects stays closely. This conclusion consistent with the corrosion defect criterion for marine pipelines at home and abroad proves the feasibility of applying the finite element non-linear analysis to the ultimate load of marine pipeline with interacting defects. Key words marine riser adjacent defects ultimate load non linearity numerical analysis ( Continued from Page 500) Automation,Fuzhou University,Fuzhou ,China; 2. Xiamen Special Equipment Inspection Institute,Xiamen ,China; ) Abstract Aiming at the PE pipe s viscoelastic properties,the Ansys was used to simulate and analyze the hot melting connector s mechanical properties of the PE pipe with circumferential surface cracks,and the Prony series was used to analog material s viscoelastic properties,as well as the 1 /4 node singular element was used to mesh the volumes at the crack boundary and to calculate the stress intensity factor of the PE pipe under the well-distributed internal pressure. The finite element simulation shows that the time of PE pipe rupture is just the moment that the crack occurs,and it is unnecessary to take PE pipe s viscoelasticity into account while calculating the stress intensity factor of circumferential surface cracks. The crack depth-pe pipe thickness ratio mainly influences the circumferential cracks. Key words PE pipe,stress intensity factor,viscoelasticity,numerical simulation