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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) >FATIGUE TESTING AND ANALYSIS OF FULL SCALE GIRTH WELDED TUBULARS
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FATIGUE TESTING AND ANALYSIS OF FULL SCALE GIRTH WELDED TUBULARS

机译：大型周长焊管的疲劳测试与分析

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摘要

Heavy duty girth welded tubulars are used for many critical structural members offshore, e.g. free spanning pipelines, risers and tethers. The fatigue properties of those girth welds are often the design limiting factor. Today's fatigue design rules for girth welded tubulars are mainly based on testing of segment specimens machined from a girth weld. Such specimens do strictly speaking not simulate all the features of a complete girth weld in a tubular. Lately some data have become available from rotating bending of full scale tubulars. However data from axial loading of full scale tubulars are rare. In this study full scale (OD 24", 609.6 mm, thickness 0.812", 20.6 mm) girth welded tubulars were fatigue tested in axial tension. Each tubular specimen contained three girth welds, equalling almost 6 m of weldment for each test. Both as-welded, TIG-dressed and ground weldments were included in the test program. The fracture surfaces were inspected for determination of the initiation point and its relation to welding flaws. The test results are compared to common fatigue design curves. The significance of embedded weld flaws in ground welds and the relationship to S-N curves for ground welds is discussed.
机译：重型环焊管用于海上的许多关键结构构件，例如自由跨接的管道，立管和系绳。这些环缝焊缝的疲劳性能通常是设计的限制因素。当今的环缝焊管疲劳设计规则主要基于对由环缝焊缝加工的扇形试样的测试。从严格的意义上讲，此类样品不能模拟管状中完整环焊的所有特征。最近，一些数据可以从满刻度管的旋转弯曲中获得。但是，全尺寸管的轴向载荷数据很少。在这项研究中，对全尺寸（外径24“，609.6 mm，厚度0.812”，20.6 mm）的环焊管进行了轴向拉伸疲劳试验。每个管状试样包含三个环缝焊缝，每个测试的焊缝约等于6 m。焊接，TIG焊和地面焊件都包括在测试程序中。检查断裂表面以确定起始点及其与焊接缺陷的关系。将测试结果与常见的疲劳设计曲线进行比较。讨论了接地焊缝中埋藏的焊缝缺陷的重要性以及与接地焊缝的S-N曲线的关系。

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