基于参考应力法的海底腐蚀管道剩余强度评价

在役海底管道所处海洋环境恶劣，管道发生腐蚀后剩余强度降低。为了更加准确地计算管道的剩余强度，基于ANSYS非线性有限元模拟，采用参考应力法，研究了参考应力分别为(SMYS+SMTS)/2，1.1SMYS，SMYS+69，0.8SMTS，0.9SMTS，SMTS的海底管道剩余强度，将结果与爆破实验数据作对比，提出了参考应力和流变应力取值的推荐算法。研究结果表明，在海底腐蚀管道剩余强度有限元分析中，对于X46，X60和X80管道，建议分别使用(SMYS+SMTS)/2，0.9SMTS和SMTS作为参考应力；推荐使用(SMYS+SMTS)/2, SMYS+69和 1.1SMYS三者中的最大值作为流变应力。

Evaluation on residual strength of submarine corrosion pipeline based on reference stress method

The in-service submarine pipeline is in the severe marine environment, so the residual strength of the pipeline decreases after corrosion. In order to calculate the residual strength of the pipeline more accurately, based on the ANSYS nonlinear finite element simulation, the residual strength of submarine pipeline with the reference stress as (SMYS+SMTS)/2, 1.1SMYS, SMYS+69, 0.8SMTS, 0.9SMTS and SMTS respectively were studied by using the reference stress method. The results were compared with the data from blasting experiment, and the recommended algorithm for the valuing of reference stress and flow stress was put forward. The results showed that in the finite element analysis on the residual strength of submarine corrosion pipeline, the suggested reference stress for X46, X60 and X80 pipeline was (SMYS+SMTS)/2, 0.9 SMTS and SMTS respectively. It was recommended that the maximum value of (SMYS+SMTS)/2, SMYS+69 and 1.1 SMYS should be taken as the flow stress in the calculation.