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首页> 外文会议>International offshore and polar engineering conference;ISOPE-2009 >Fracture Assessment of Elastic-Plastic Steel Pipelines Subject to Multi-cycle Bending
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Fracture Assessment of Elastic-Plastic Steel Pipelines Subject to Multi-cycle Bending

机译：多周期弯曲下的弹塑性钢管断裂评估

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摘要

In this work a large scale bending test, representative of conditionsexperienced under reeling of steel pipelines, is discussed.The pipeline material is an X65 steel and the pipe has a diameterof 273.1 mm (10.75') wall thickness of 14.3 mm. The pipe wassubject to multi-cycle reverse bending in a four-point bending rig.The crack driving force in terms of crack tip opening displacement(CTOD) was measured and compared with the results fromthree-dimensional finite-element analysis of the notched pipe.A number of existing estimation schemes for crack driving force,in addition to a novel estimation scheme developed by the authors,have also been evaluated. An important feature of the latterscheme is the ability to account for a yield plateau in thedeformation response of the material. It has been seen that themeasured CTOD-strain relationships for multi-cycle bending areclosely predicted by the new estimation scheme. The first cycle,in particular, provides a robust validation of the procedure as thematerial response in this case is strongly affected by the existenceof a yield plateau in the material tensile response.
机译：在这项工作中，将讨论代表钢管弯曲过程中所经历条件的大规模弯曲试验。管道材料是X65钢，管的直径为273.1毫米（10.75英寸），壁厚为14.3毫米。在四点弯曲装置中对该管子进行多周期反向弯曲。测量了以裂纹尖端张开位移（CTOD）表示的裂纹驱动力，并将其与缺口管的三维有限元分析结果进行了比较。除了作者开发的新颖的估计方案外，还评估了许多现有的裂纹驱动力估计方案。后一种方案的重要特征是能够在材料的变形响应中说明屈服平稳的能力。可以看出，通过新的估计方案可以精确地预测多循环弯曲的CTOD应变关系。特别地，第一循环提供了程序的可靠验证，因为在这种情况下，材料响应受材料拉伸响应中屈服平稳期的强烈影响。

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