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首页> 外文期刊>Chemical and Petroleum Engineering >EFFECT OF STRESS CONCENTRATION IN A WELDED SEAM ON THE LOW-CYCLE FATIGUE OF LARGE-DIAMETER PIPES
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EFFECT OF STRESS CONCENTRATION IN A WELDED SEAM ON THE LOW-CYCLE FATIGUE OF LARGE-DIAMETER PIPES

机译：焊缝应力集中对大口径管低周疲劳的影响

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摘要

The strength of arterial pipelines is analyzed in accordance with the method of limiting state, which is determined by the rupture strength of pipes due to internal static pressure, and is regulated by Construction Rule and Regulation 2.0506-85. A thin-wall shell subject to internal pressure and longitudinal force can be adopted as the basic computational scheme in evaluating the strength of pipelines. Analysis of the operating conditions of arterial conduits carrying petroleum products indicates that a nonstationary loading regime of internal pressure is characteristic of basic components of linear section of the pipelines. It is known that the cyclic longevity of large-diameter pipes (LDP) is determined by the magnitude of local deformations in the zone of the welded seam. Local excitation of the stress state in the welded joint of a pipe is governed by the weld reinforcement, defects in the form of undercuts and poor penetration of the seam, displacement of the edges in the seam, and angularity of shop welds, as well as out-of-roundness of the pipe section. Local excitation of the stress state is determined, above all, by stress concentration (weld reinforcement, undercut, and poor penetration), and bending effects (displacement of edges, angularity of the welded joint, and out-of-roundness of the pipe section). It is important to note that 90% of pipeline failures occur along or near the welded seam.
机译：根据极限状态的方法对动脉管道的强度进行分析，极限状态由内部静压力引起的管道破裂强度确定，并受《施工规范》和《工程规范》 2.0506-85的规定。评估管道强度的基本计算方案可以采用受内压和纵向力作用的薄壁壳体。对运载石油产品的动脉导管的工作条件的分析表明，内部压力的非平稳加载方式是管道线性部分基本组成部分的特征。众所周知，大口径管道（LDP）的循环寿命是由焊缝区域内局部变形的大小决定的。管道焊接接头中应力状态的局部激发受焊缝增强，底切形式的缺陷和接缝渗透性差，接缝中边缘的位移以及车间焊缝的成角度以及管段的不圆度。应力状态的局部激发主要取决于应力集中（焊接增强，底切和不良渗透）以及弯曲效果（边缘位移，焊接接头的角度和管段的不圆度） ）。重要的是要注意，90％的管道故障发生在焊缝附近或附近。

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