Abstract: A numerical model for predicting the burst failure of corroded pipeline was established using the non-linear finite element method, in which some technical points including the element mesh, material mode, non-linear solution and failure criterion were discussed. The full-size pipe burst experiments of pipelines with different material, various sizes and defect were analyzed and computed using this model. Based on the calculation result, a new formula for predicting failure pressure was presented. The depth, length and width of a defect were involved in this formula. Compared with other assessment methods and experiments, the formula had a satisfactory precision.

Key words: oil and gas pipeline, residual strength, safety evaluation, corrosion, failure pressure, prediction model, finite element method

摘要： 采用非线性有限元法建立了含缺陷管道爆破失效的数值模型,以此预测腐蚀缺陷管道的失效压力。分析了模型中的单元划分、材料模式、非线性求解方法、失效判据等技术要点,对不同管材、规格以及缺陷尺寸的全尺寸管道爆破试验结果进行了分析和计算,验证了所建模型的准确性。基于有限元计算结果,同时考虑缺陷长度、深度、宽度等因素的影响,拟合出含缺陷管道的失效压力预测公式,与其他方法以及试验结果相比,该公式计算误差较小。

关键词: 油气管道, 剩余强度, 安全评定, 腐蚀, 失效压力, 预测模型, 有限元法