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首页> 外文期刊>Marine Structures >Fitness-for-purpose assessment of cracked offshore wind turbine monopile
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Fitness-for-purpose assessment of cracked offshore wind turbine monopile

机译：裂纹近海风力涡轮机纪用的健身评估

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In this paper, the procedure for flaw acceptability assessment is examined through a case study of a semi-elliptical surface crack in an offshore monopile as it grows till it forms a through thickness crack. Using the procedure prescribed in an industrial standard (BS 7910), the fracture ratio, Kr is shown to increase monotonically with increasing crack depth. The load ratio, Lr, is initially insensitive to the crack depth. However, there is a rapid increase in Lr when the crack depth to thickness ratio exceeds 80%. Lr values obtained from detailed 3D FE limit analysis using elasticperfectly-plastic material behaviour do not exhibit the asymptotic behaviour predicted by BS 7910 as the flaw transitions from deep crack to through-thickness crack. Furthermore, Kr predicted by BS 7910 is shown to be an over-estimation for the typical dimensions of offshore monopiles. The findings suggest that a structure with a deep flaw may be identified as unacceptable based on BS 7910 when it may still possess a non-trivial amount of structural residual life. This is a concern for monopiles where crack growth as a large flaw forms a significant part of the total life.
机译：在本文中，通过在海上单潜水艇中的半椭圆形表面裂缝进行潜水可接受评估程序，因为它的发展使其形成通过厚度裂缝。使用在工业标准（BS 7910）中规定的程序，裂缝比，KR显示随着裂缝深度的增加，单调地增加。负载比LR最初对裂缝深度不敏感。然而，当裂缝深度到厚度比率超过80％时，LR的快速增加。使用弹性射精 - 塑料材料行为的详细3D Fe限制分析获得的LR值不表现出BS 7910预测的渐近行为，因为从深裂纹到通孔裂缝。此外，BS 7910预测的KR被示出为近海单opopiles的典型尺寸的过度估计。结果表明，当仍然具有非琐碎量的结构残余寿命时，可以识别具有深度缺陷的结构，这是不可接受的。这是一个关注的单一，其中裂缝增长为大缺陷，形成了总寿命的重要组成部分。

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