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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) >CONTROLLED WELD TOE PROFILES FOR FATIGUE LIFE EXTENSION IN FSO'S FPSO'S
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CONTROLLED WELD TOE PROFILES FOR FATIGUE LIFE EXTENSION IN FSO'S FPSO'S

机译：FSO和FPSO中疲劳寿命延长的受控焊趾轮廓

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Application of controlled weld toe profiles can be considered an option to extend the fatigue life of welded connections when ongoing tankers are converted in dry docks to serve like offshore ships (FPSOs and FSOs). Very slim chances to implement such fatigue improvement will arise when these vessels are in service, since a converted ship is designed to be inspected, maintained and repaired in situ and not in dry dock as it is uneconomical to interrupt production. Codes recognize fatigue life extension by means of a controlled weld toe profile, e.g. [1]. Application of a controlled weld toe profile during conversion in selected areas previously identified by stress analysis of the hull structure can lead to extend the converted vessel fatigue life to comply with an expected field life. The American Bureau of Shipping S-N curves allow a credit of 2.2 on fatigue life when suitable toe grinding and NDE are provided. A controlled weld toe profile can be applied in fatigue crack repaired welds during ship conversion or even on those that during ship conversion are found in a non-cracked condition but were identified prone to fatigue cracking in a stress assessment analysis under in-service conditions. Credit on fatigue life in various codes and results from experimental data obtained from fatigue tested specimens with a controlled weld toe profile are given. Comments on the design of a controlled weld toe profiles and recommendations based on experimental experience for the implementation of equipment to perform a controlled weld toe profile are also given. A Fracture Mechanics approach for the assessment of controlled weld toe profiles for fatigue life extension purposes is described. Initially, a comparison of SCFs for a typical ship hull plate connection with and without weld toe profile control determined by Finite Element Analysis (FEA) is presented. Then, results obtained from the FEA connection such as through plate stress distribution are used in a Fracture Mechanics Analysis to compare the fatigue crack growth curve in as-welded condition to that with controlled weld toe profile.
机译：当将进行中的油轮在干船坞中改装成像海上船舶（FPSO和FSO）一样使用时，可控的焊趾轮廓可以被认为是延长焊接连接疲劳寿命的一种选择。这些船只在使用中时，实现这种疲劳改善的机会非常渺茫，因为改装后的船被设计为在现场而不是在干船坞进行检查，维护和修理，因为这不经济，会中断生产。规范通过控制焊趾轮廓来识别疲劳寿命的延长，例如[1]。在转换期间在先前通过船体结构的应力分析确定的选定区域中应用受控的焊趾轮廓可以导致延长转换后的船舶疲劳寿命，以符合预期的现场寿命。当提供适当的脚趾磨削和NDE时，美国船级社的S-N曲线可得出2.2的疲劳寿命。可以将受控的焊趾轮廓应用于船舶改装过程中的疲劳裂纹修复焊缝，甚至可以应用于在船舶改装过程中发现的非裂纹条件下但在使用条件下的应力评估分析中被确定易于疲劳裂纹的焊缝。给出了各种代码中的疲劳寿命，并给出了从具有受控脚趾轮廓的疲劳测试样本获得的实验数据得出的结果。还给出了关于可控焊趾轮廓的设计的评论，并根据实验经验提出了用于实施可控焊趾轮廓的设备的建议。描述了一种断裂力学方法，用于评估可控制的焊趾轮廓，以延长疲劳寿命。最初，对通过有限元分析（FEA）确定的具有和不具有焊趾轮廓控制的典型船体板连接的SCF进行了比较。然后，将从FEA连接获得的结果（例如通过板应力分布）用于断裂力学分析，以比较焊接条件下的疲劳裂纹扩展曲线与受控焊趾轮廓的疲劳裂纹扩展曲线。

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