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首页> 外文会议>International Conference on Offshore Mechanics and Arctic Engineering 2007(OMAE2007) vol.2; 20070610-15; San Deigo,CA(US) >THE EFFECT OF STRUCTURAL COMPLIANCE ON FATIGUE CRACK GROWTH IN JACKET STRUCTURES
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THE EFFECT OF STRUCTURAL COMPLIANCE ON FATIGUE CRACK GROWTH IN JACKET STRUCTURES

机译：结构顺应性对外套结构疲劳裂纹扩展的影响

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Quantifying the fatigue crack growth and remaining life in joints making up jacket structures forms one of the basic requirements of a sub sea structural integrity assurance scheme. The accurate prediction of the likely failure time of welds allows a realistic estimate of the risk of structural collapse at any stage in a structure's life. It is current practice to consider the welds making up the member as individual components rather than looking at the whole compliant system of welds, joints, members, and structural framing arrangement. In this approach, the nominal loads in any one member are determined from an analysis of the undamaged structure and are then applied to a crack growth solution using handbook stress intensity factor solutions to determine the fatigue life of that component. This method assumes that the applied load is purely load-controlled whereas in reality it is a combination of both load and displacement controlled. A study was performed to investigate the influence of the surrounding structure on crack growth in tubular members located in jacket structures. The aim of the study was to verify whether the traditional approach, which uses stresses from undamaged structures to evaluate crack growth in individual components, is appropriate. The findings of the study showed that structural compliance has only a beneficial effect on fatigue growth in the latter stage of the crack growth process with crack lengths greater than 40% circumference. It was shown that the beneficial effect of structural compliance on fatigue crack growth in the later stage of the growth process does not significantly increase the overall fatigue life. It was concluded, that the current approach, which uses stresses from undamaged structures to evaluate crack growth in individual components, is valid and safe to use.
机译：量化构成护套结构的接头中的疲劳裂纹扩展和剩余寿命是海底结构完整性保证方案的基本要求之一。对焊缝可能失效时间的准确预测可以对结构寿命中任何阶段的结构坍塌风险进行实际评估。当前的惯例是将构成构件的焊缝视为单独的组件，而不是着眼于焊缝，接头，构件和结构框架布置的整个顺应性系统。在这种方法中，可以通过对未损坏结构的分析来确定任意一个构件中的标称载荷，然后使用手册应力强度因子解将其应用于裂纹扩展解，以确定该组件的疲劳寿命。该方法假定所施加的载荷是纯载荷控制的，而实际上，它是载荷和位移受控的组合。进行了一项研究以调查周围结构对位于外套结构中的管状构件中裂纹扩展的影响。该研究的目的是验证使用未损坏结构的应力来评估单个组件中裂纹扩展的传统方法是否合适。研究结果表明，结构顺应性仅对裂纹长度大于40％周长的裂纹扩展过程的后期阶段的疲劳增长具有有益作用。结果表明，在生长过程的后期阶段，结构顺应性对疲劳裂纹扩展的有益作用不会显着延长整体疲劳寿命。得出的结论是，当前的方法使用未损坏结构的应力来评估单个组件中的裂纹扩展，是有效且安全的方法。

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