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首页> 外文会议>ASME international pipeline conference;IPC2010 >BUCKLING AND UNSTABLE COLLAPSE OF SEAMLESS PIPES AND TUBES
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BUCKLING AND UNSTABLE COLLAPSE OF SEAMLESS PIPES AND TUBES

机译：无缝管材的屈曲和不稳定塌陷

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Deepwater pipelines and high pressure casing and tubing are prone to buckling and unstable collapse under compressive loading and external pressure. The most important parameters governing the unstable collapse behaviour of perfectly round pipes and tubes are the circumferential yield stress of the material, the Young's modulus and the ratio of diameter over thickness (D/t).Initial imperfections in the geometric shape of the pipe, like wall thickness variations or ovality, can have a pronounced influence on the collapse resistance of a pipe. Local dents can reduce the collapse pressure significantly, and trigger propagating buckles along the line. In this paper, buckling and unstable collapse of seamless pipes and tubes are studied.First, collapse pressure experiments for High Collapse Casing grades L80HC and P110HC are presented, showing that the seamless pipe production at ArcelorMittal Tubular Products in Ostrava (Czech Republic) is under tight quality control and complies with the API standards.Then, the critical collapse pressure is calculated for different scenarios. Depending on the ratio of diameter to wall thickness, four regimes are identified: yielding collapse, followed by plastic collapse, a transition range, and finally elastic collapse. For each condition, closed form expressions are derived for the critical collapse pressures. In addition, simplified design equations are reviewed to quickly estimate the collapse pressure.Then, the influence of initial imperfections on the collapse resistance is studied. Both the effects of geometric imperfections (ovality and wall thickness eccentricity) and material properties (especially yield stress and residual stresses) are addressed. In the end, an enhanced design equation is proposed to predict the critical collapse pressure of dented seamless pipes. This equation is validated by collapse experiments, can account for different initial imperfections, and is valid for a wide range of D/t ratios.
机译：深水管道以及高压套管和油管在压缩载荷和外力作用下易于弯曲并不稳定塌陷。决定完美圆形管材不稳定塌陷行为的最重要参数是材料的周向屈服应力，杨氏模量以及直径与厚度之比（D / t）。 管道几何形状的初始缺陷（例如壁厚变化或椭圆度）可能会对管道的抗塌陷性产生显着影响。局部凹痕可显着降低坍塌压力，并触发沿线传播的弯折。本文研究了无缝管的屈曲和不稳定塌陷。 首先，进行了L80HC和P110HC等级高塌陷套管的塌陷压力实验，表明在俄斯特拉发（捷克共和国）的ArcelorMittal管状产品的无缝管生产受到严格的质量控制，并符合API标准。 然后，针对不同情况计算临界坍塌压力。根据直径与壁厚的比率，确定了四种状态：屈服塌陷，然后是塑性塌陷，过渡范围，最后是弹性塌陷。对于每种条件，都导出了临界坍塌压力的闭合形式表达式。此外，还审查了简化的设计方程式，以快速估算坍塌压力。 然后，研究了初始缺陷对抗塌陷性的影响。几何缺陷（椭圆度和壁厚偏心率）和材料特性（尤其是屈服应力和残余应力）的影响都得到了解决。最后，提出了一种改进的设计方程式，以预测凹痕无缝管的临界坍塌压力。该方程已通过坍塌实验验证，可以解释不同的初始缺陷，并且适用于宽范围的D / t比。

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