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对内腐蚀缺陷管道建立了三维非线性有限元模型,预测其失效压力,并分析管道壁厚、内压、缺陷尺寸对最小剩余壁厚的影响。研究结果表明:在均匀腐蚀速率下,管道壁厚、内压、缺陷深度和长度是影响最小剩余壁厚的主要因素,缺陷宽度影响较小,可以忽略缺陷宽度方向尺寸的变化;有限元计算的最小剩余壁厚与试验结果吻合较好;最小剩余壁厚与管道壁厚、内压近似呈线性关系,与缺陷长深比近似呈负指数关系。基于有限元计算结果,拟合得到最小剩余壁厚公式,其计算值与爆破试验结果接近,可以为管道剩余寿命评价提供参考。
The three-dimensional non-linear finite element model was built for the inner corrosion-defective pipe, the failure pressure was predicted, and the influence of pipe wall thickness, internal pressure and defect size on the minimum remaining wall thickness was analyzed. The results show that under the uniform corrosion rate, the wall thickness, internal pressure, depth and length of the pipe are the main factors that affect the minimum residual wall thickness. The width of the defect has little influence and the width of the defect can be neglected. The minimum residual wall thickness agrees well with the experimental results. The minimum residual wall thickness is approximately linear with the wall thickness and internal pressure of pipeline, and shows a negative exponential relationship with the depth and depth of defects. Based on the finite element calculation results, the formula of the minimum residual wall thickness is fitted and the calculated value is close to the result of the blasting test, which can provide a reference for the remaining life assessment of the pipeline.