弯曲作用下凹陷海管剩余极限强度研究

Research on Residual Ultimate Strength of Dent Pipe Under Bending

在海洋油气开发中,海底管道一直占据着重要位置,各国学者对其可靠性进行了广泛研究.环境因素或人为因素常常会使海底管道表面产生机械损伤,降低管道极限强度,导致管道失效概率的增加.凹陷是管道表面最典型的机械损伤形式,易造成管壁及截面的永久变形,还可能诱发裂纹、凹槽等其他缺陷,这对管道的可靠性极为不利.文中采用试验与数值仿真相结合的方式,以无缝钢管为对象,对弯曲作用下凹陷海管的剩余极限强度展开研究,探讨了凹陷类型及凹陷深度等参数对管道极限强度的影响.

Environmental factors or human factors will cause mechanical damage to the surface of submarine pipelines,reduce the ultimate strength of pipelines and increase the probability of pipeline failure.Dent is the most typical mechanical damage form on the pipe surface,which is easy to cause permanent deformation of the pipe wall and section,and may also induce cracks,grooves and other defects.In this paper,the residual ultimate strength of dent pipes under bending was studied by combining experiment and numerical simulation,taking seamless steel pipes as the object,and the influence of parameters such as dent type and depth on the ultimate strength of pipes was discussed.