Various tensile strain capacity (TSC) prediction equations have recently been presented by many research organizations such as Pipeline Research Council International and ExxonMobil Corporation. The gas industry uses these equations to determine the allowable strain for the cracked pipe. However, these TSC prediction equations cannot be applied to pipes with other defects such as corrosion or mechanical damage. Corrosion defects are the most common type of defect in actual operating conditions, and thus, they are an essential element for evaluating pipe structural integrity as they are most frequently connected to accidents. Therefore, it is necessary to develop a TSC prediction equation for corroded pipes. In this paper, to propose a new TSC prediction equation for corroded pipes, we conducted parametric finite element (FE) analyses using fracture strain criteria. To determine the appropriate fracture strain criteria, we reviewed several methods to construct the fracture locus. Then, we conducted parametric FE analyses using this fracture locus by considering variables affecting structural integrity, such as corrosion depth, corrosion length, wrap angle, and pressure ratio. Lastly, we presented the TSC prediction equation using these analyses.

最近，许多研究组织（例​​如国际管道研究委员会和埃克森美孚公司）提出了各种拉伸应变能力（TSC）预测方程式。天然气工业使用这些方程式来确定破裂管的允许应变。但是，这些TSC预测方程式不适用于具有其他缺陷（例如腐蚀或机械损坏）的管道。腐蚀缺陷是实际操作条件下最常见的缺陷类型，因此，腐蚀缺陷是评估管道结构完整性的必要元素，因为它们最常与事故有关。因此，有必要建立腐蚀管道的TSC预测方程。在本文中，为腐蚀管道提出一个新的TSC预测方程，我们使用断裂应变准则进行了参数有限元（FE）分析。为了确定合适的断裂应变标准，我们回顾了几种构造断裂位点的方法。然后，我们通过考虑影响结构完整性的变量，例如腐蚀深度，腐蚀长度，包角和压力比，使用该断裂轨迹进行了参数有限元分析。最后，我们使用这些分析提出了TSC预测方程。