Dent is a common geometric deformation defect on oil and gas pipelines. Compared with plain dent, composite dent has a greater impact on the pipe’s load-bearing capacity. There are great differences in the evaluation methods about dent under different loads, and it is significant in practical engineering to study the load-bearing capacity of dented pipes under specific working conditions. This paper summarizes the research status of load-bearing capacity of dented pipes under internal pressure, bending moment, axial force and combined loads in recent years from the aspects of experiment and simulation, analyses the progress of relevant evaluation criteria, and points out the shortcomings and future research directions. At present, corresponding evaluation criteria have been proposed for crack dent under internal pressure, plain dent under bending moment and folded dent under axial compression. The formula for calculating the critical compressive strain of plain dent under bending moment is relatively mature. However, the study on the dent at welds is insufficiency, and the depth-based evaluation method is not suitable for folded dent. Furthermore, the residual strength of dented pipes under combined loads has not attracted much attention.

凹痕是石油和天然气管道上常见的几何变形缺陷。与普通凹痕相比，复合凹痕对管道的承重能力影响更大。不同负荷下的凹痕评估方法存在很大差异，研究在特定工作条件下的凹口管的承载能力在实际工程中具有重要意义。本文从实验和仿真的角度总结了近年来内压，弯矩，轴向力和组合载荷作用下缩孔管承载能力的研究现状，分析了相关评价标准的进展，指出了不足之处。和未来的研究方向。目前，已经提出了相应的内压裂纹评价标准，弯曲力矩作用下的普通凹痕，轴向压缩作用下的凹痕。弯矩作用下普通凹痕临界压缩应变的计算公式已经比较成熟。但是，对焊缝凹痕的研究还不够，基于深度的评价方法不适用于折叠凹痕。此外，凹口管在组合载荷下的残余强度并未引起太多关注。