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首页> 外文会议>International Conference on Offshore Mechanics and Arctic Engineering 2007(OMAE2007) vol.4; 20070610-15; San Deigo,CA(US) >PROBABILISTIC FRACTURE MECHANICS METHODOLOGY APPLIED TO PIPES SUBJECTED TO MULTIPLE REELING CYCLES
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PROBABILISTIC FRACTURE MECHANICS METHODOLOGY APPLIED TO PIPES SUBJECTED TO MULTIPLE REELING CYCLES

机译：应用于多个旋转周期的管道的概率断裂力学方法学

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摘要

Reeling process is one of the more used methods for installations of linepipes in recent years. Pipes are welded onshore and subsequently reeled onto a drum. During installation, the line is unreeled, straightened, and then laid into the sea. The pipe is subjected to severe cyclic plastic deformation. Due to the characteristics of the process, it is necessary to guarantee the integrity of the components during and after the process. For this reason, structural reliability analyses are essential requirements. In a previous work [1], a fracture mechanics based methodology was developed to obtain a method to assess the structural reliability of reeled pipes. The problem of several reeling cycles was considered. In addition to a fracture mechanics methodology, a formulation considering fatigue crack growth (FCG) controlled by AJ parameter was developed. This formulation accounts for the crack growth produced during subsequent reeling cycles. In another work [2], a probabilistic fracture mechanics assessment approach to perform the structural reliability analysis of tubes subjected to a reeling process was developed. This procedure takes into account the statistical distributions of the material properties and pipe geometry, using a fracture mechanics approach and the Monte Carlo method. In this work, the probabilistic fracture mechanics approach was applied for the case of multiple reeling cycles that includes AJ-based fatigue crack growth and reliability analysis. A particular case of interest was studied and tolerable defect sizes were determined for different number of reeling cycles taking into account the parameters variability.
机译：绕线工艺是近年来安装管道的一种较常用的方法。将管道焊接在岸上，然后将其卷到鼓上。在安装过程中，将管线松开，拉直，然后铺设到海中。管道承受严重的周期性塑性变形。由于过程的特性，有必要在过程中和之后保证组件的完整性。因此，结构可靠性分析是必不可少的要求。在以前的工作中[1]，开发了一种基于断裂力学的方法，以获得一种评估卷管结构可靠性的方法。考虑了几个卷取周期的问题。除了断裂力学方法外，还开发了一种考虑了AJ参数控制的疲劳裂纹扩展（FCG）的配方。该配方说明了在随后的卷取周期中产生的裂纹扩展。在另一项工作中[2]，开发了一种概率断裂力学评估方法，可以对进行卷取过程的管材进行结构可靠性分析。该过程使用断裂力学方法和蒙特卡洛方法考虑了材料特性和管道几何形状的统计分布。在这项工作中，概率断裂力学方法适用于多个卷取循环的情况，包括基于AJ的疲劳裂纹扩展和可靠性分析。研究了一个特定的案例，并考虑了参数可变性，确定了不同卷取周期的可容许缺陷尺寸。

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