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Structural integrity assessment of floating offshore wind turbine support structures

机译：浮动海上风力涡轮机支撑结构的结构完整性评估

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摘要

Floating offshore wind turbines are becoming more attractive to the wind industry due to their capability to operate larger turbines in deeper waters. The floating support structures are anchored to the seabed via mooring chains to impede the structure's unwanted movements. The combination of cyclic stresses and the corrosive marine environment makes the floating support structures vulnerable to corrosion pitting and subsequently fatigue crack initiation and propagation. In this study a framework is proposed to simulate fatigue crack growth from multiple corrosion pits at critical spots of the Spar-type floating support structures to examine the status of the crack during several years of operation. The proposed advanced fracture mechanics based approach provides a methodology to assess the integrity of the structure and subsequently plan for preventive or curative maintenance. The crack growth rate is examined for both singular and multiple cracks at different R ratios and for different stress levels using ABAQUS XFEM. Following numerical simulations, a sensitivity analysis is carried out using Crackwise software for different values of plate thickness, R ratio and initial crack size. The numerical results are discussed in terms of the corrosion pitting effects on fatigue life assessment of floating offshore wind turbines.
机译：浮动近海风力涡轮机由于其在深水中的较大涡轮机的能力而变得更具吸引力。浮动支撑结构通过系泊链锚定到海底上，以阻止结构的不需要的运动。循环应力和腐蚀性海洋环境的组合使浮动支持结构易受腐蚀点蚀和随后疲劳裂纹引发和繁殖。在该研究中，提出了一种框架，以在翼梁型浮动支撑结构的临界斑点的临界斑点中模拟疲劳裂缝生长，以检查几年后裂缝的状态。所提出的基于先进的骨折力学方法提供了一种方法来评估结构的完整性，并随后计划预防或治疗维护。用ABAQUS XFEM检查不同R比的奇异和多个裂缝的奇异和多个裂缝的裂缝生长速率。在数值模拟之后，使用易于平坦的板厚度，R比和初始裂纹尺寸的致曲面进行灵敏度分析。根据浮动近海风力涡轮机的疲劳寿命评估的腐蚀点效应来讨论数值结果。

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