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abstract
Conventional procedures used to assess the integrity of corroded piping systems with axial defects generally employ simplified failure criteria based upon a plastic collapse failure mechanism incorporating the tensile properties of the pipe material. These methods establish acceptance criteria for defects based on limited experimental data for low strength structural steels which do not necessarily address specific requirements for the high grade steels currently used. For these cases, failure assessments may be overly conservative or provide significant scatter in their predictions, which lead to unnecessary
repair or replacement of in-service pipelines. Motivated by these observations, this study examines the applicability of a stress-based criterion based upon plastic instability analysis to predict the failure pressure of corroded pipelines with axial defects. A central focus is to gain additional insight into effects of defect geometry and material properties on the a
摘要

常规使用的程序，以评估的完整性，腐蚀管道系统轴向缺陷通常采用简化的破坏准则为基础的塑性垮塌失效机理纳入拉伸性能的管材。这些方法建立验收标准的基础上的缺陷有限实验数据的低强度结构钢不一定解决具体的要求，高品位钢材目前使用的。在这种情况下，失败的评估可能过于保守，或提供重要的散射在他们的预测，从而导致不必要的

修理或更换提供服务的管道。出于上述意见，本研究的适用性应力为基础的标准为基础的塑料不稳定分析预测失败的压力管道的腐蚀与轴向缺陷。主要重点是获得额外的洞察影响的缺陷几何形状和材料特性的一