基于ANSYS分析的带腐蚀海底管道强度计算

采用ANSYS有限元数值计算与理论计算相结合的方法对带腐蚀海底管道进行强度计算，并对比不同腐蚀深度、长宽比以及2个腐蚀坑的不同排列方式和间距对最大应力的影响，得出：腐蚀深度是最关键的因素，腐蚀越深、长宽比越大，腐蚀造成的应力放大现象越明显；当2个腐蚀坑超过某临界间距时，可忽略腐蚀坑之间的相互影响；管道发生屈服之前的临界间距大于管道发生屈服之后的间距。对浅海海域某条海管进行强度分析，得出仅考虑均匀腐蚀计算不够精确，还应考虑腐蚀产生的应力集中现象。研究内容可为今后带腐蚀海管的强度校核提供指导借鉴。

Strength Calculation of Corroded Submarine Pipeline Based on ANSYS Analysis

ANSYS finite element method of numerical calculation combined with theoretical calculation method is used for the strength analysis of the corroded submarine pipeline. The effects of different corrosion pit depths, aspect ratios of the corrosion pits, and arrangement and spacing of two corrosion pits on the maximum stress of the pipelines are compared. It is concluded that: the corrosion depth is the most critical factor, the deeper the corrosion and the greater the aspect ratio are, the more obvious the stress amplification caused by corrosion is; when the distance between two corrosion pits exceeded certain critical value, the interaction between the corrosion pits can be ignored; the critical distance before the pipeline yielding is longer than that after the pipeline yielding. The strength of the constructed pipeline in shallow sea area is analyzed, and it is concluded that only considering the even corrosion is not accurate enough for the calculation, the stress concentration caused by the corrosion should also be considered. The research provides guidance and reference for the strength check of corroded submarine pipeline in the future.