含局部减薄缺陷管道剩余强度和剩余寿命的分析预测

Analysis of Residual Strength and Residual Life of Defective Pipes with Local Thinning

局部减薄是压力管道缺陷中常见的一种体积型缺陷,会导致压力管道的剩余强度、承载能力和安全可靠性急剧下降,还会使疲劳裂纹、管体变形、管内输送物料泄漏甚至管道爆破等情况的概率增大,使用寿命降低直至损坏失效。为了防止局部减薄带来的危害,采用ANSYS有限元分析软件,以方形缺陷为研究对象,通过改变缺陷的轴向长度、宽度和深度,考察它对剩余强度和等效应力的影响,并结合采油厂实际数据进行管道寿命预测。

Local thinning is a common volume defect in pressure pipeline defects,which can lead to sharp drop of residual strength,load capacity,safety and reliability of pressure pipelines,including fatigue cracks,pipe deformation,material leakage in pipelines,pipeline bursting and the loose of service life or even damage.In order to prevent the harm caused by local thinning,using ANSYS to study the effect of square residual on residual strength and equivalent stress by changing the defect’s axial length,defect width and defect depth was implemented to predict the pipeline’s service life through considering the actual data of oil production plant.