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首页> 外文会议>International Conference on Offshore Mechanics and Arctic Engineering, Jun 23-28, 2002, Oslo, Norway >ON REMAINING FATIGUE LIFE FRACTURE MECHANICS ANALYSIS OF FREE-SPANNING PIPELINES USING SHELL AND LINE-SPRING ELEMENTS
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ON REMAINING FATIGUE LIFE FRACTURE MECHANICS ANALYSIS OF FREE-SPANNING PIPELINES USING SHELL AND LINE-SPRING ELEMENTS

机译：自由弹塑性管道的剩余疲劳寿命断裂力学分析

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摘要

The present paper addresses fatigue crack-growth for free-spanning pipelines. The main sources of cyclic stresses which cause the crack-growth are vortex-induced vibrations (VIV) of the pipeline in the cross-flow and in-line directions. In the presence of initial weld defects, such cyclic stresses may lead to leakage and sudden fracture. The crack-growth process is modelled using so-called line-spring elements. These are matched with shell elements which are applied for modelling the pipe itself. The crack-growth is simulated by performing several simulations with different crack sizes. The shape of the crack also allowed to vary during the growth (i.e a/c-ratio). The static equilibrium position of the pipeline for a specific free span is first established by the non-linear Finite Element program ABAQUS. The line-spring elements are matched to interface with the shell elements which represent the pipe outside the region where the crack is located. Based on such simulations, the stress intensity factors at the crack-tip are computed. These calculations are performed for several different crack-sizes. Finally, the remaining fatigue life is estimated by means of fracture mechanics in terms of analytical and semi-empirical approaches.
机译：本文解决了自由跨度管道的疲劳裂纹扩展问题。引起裂纹扩展的循环应力的主要来源是管道在横流方向和管道方向上的涡激振动（VIV）。在存在初始焊接缺陷的情况下，此类循环应力可能会导致泄漏和突然断裂。裂纹生长过程是使用所谓的线弹簧元素建模的。这些与用于对管道本身建模的外壳元素匹配。通过执行多个具有不同裂纹尺寸的模拟来模拟裂纹扩展。裂纹的形状在生长过程中也允许变化（即，a / c比）。对于特定的自由跨度，管道的静态平衡位置首先由非线性有限元程序ABAQUS建立。线弹簧元素与外壳元素相匹配，而外壳元素代表位于裂缝所在区域之外的管道。基于这样的模拟，计算裂纹尖端处的应力强度因子。这些计算是针对几种不同的裂纹尺寸进行的。最后，通过分析和半经验方法，通过断裂力学估算剩余的疲劳寿命。

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