【摘要】：運行在惡劣環(huán)境中的海底管道,往往受到內(nèi)壓、軸力和彎矩等復雜荷載的聯(lián)合作用。腐蝕會導致管壁局部變薄,降低管道極限承載力。為保證管道安全高效運行,準確預測和分析復雜荷載作用下的塑性極限承載力和變形行為就顯得尤為重要�？紤]大應變和大變形、應力強化和材料非線性,運用數(shù)值仿真軟件建立腐蝕缺陷管道的三維實體有限元模型,在全尺寸管道破壞試驗驗證的基礎上,對腐蝕管道在內(nèi)壓、軸向壓力和彎矩相互作用下的失效模式和極限彎矩承載力進行了相關研究,并進行了腐蝕缺陷幾何參數(shù)的敏感性分析。研究結果表明:初始內(nèi)壓和初始軸向壓力會顯著降低腐蝕管道的極限彎矩承載力,并且影響最終的失效模式;在腐蝕缺陷幾何尺寸參數(shù)中,腐蝕寬度比腐蝕深度和腐蝕長度的影響更大。
[Abstract]:Submarine pipelines operating in harsh environments are often subjected to complex loads, such as internal pressure, axial force and bending moment. Corrosion will lead to local thinning of the pipe wall and decrease the ultimate bearing capacity of the pipe. In order to ensure the safe and efficient operation of pipeline, it is very important to accurately predict and analyze the plastic ultimate bearing capacity and deformation behavior under complex loads. Considering large strain and large deformation, stress strengthening and material nonlinearity, the three-dimensional solid finite element model of corrosion defect pipeline is established by using numerical simulation software. On the basis of full-scale pipeline failure test, the corrosion pipe is subjected to internal pressure. The failure mode and ultimate moment bearing capacity under the interaction of axial pressure and bending moment are studied, and the sensitivity analysis of geometric parameters of corrosion defects is carried out. The results show that the initial internal pressure and the initial axial pressure can significantly reduce the ultimate bending moment bearing capacity of the corroded pipeline and affect the final failure mode. The influence of corrosion width is greater than corrosion depth and corrosion length in the geometric dimension parameters of corrosion defects.
【作者單位】： 大連理工大學海岸和近海工程國家重點實驗室;
【基金】：國家重點基礎研究發(fā)展計劃(973計劃)(2011CB013702) 新世紀優(yōu)秀人才支持計劃資助(NCET-11-0051)
【分類號】：P756.2
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本文編號：2468614