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首页> 外文会议>International offshore and polar engineering conference;ISOPE-2009 >The Influence of Internal Pressure on Ductile Fracture Behavior from a Surface Defect on a Pipe
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The Influence of Internal Pressure on Ductile Fracture Behavior from a Surface Defect on a Pipe

机译：内压对管道表面缺陷造成的韧性断裂行为的影响

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摘要

This paper presents the influence of internal pressure on ductile fracturebehavior conducting three pressurized and un-pressurized pipe tensiontests with machined surface notches. Especially, it is focused oninvestigation of the ductile crack initiation from the aspects on effectiveopening displacement at a notch tip. The influence of internal pressurewas negligible on ductile crack initiation from a surface notch. On theother hand, the crack driving force became higher as internal pressureincreased. Ductile tearing resistance curves (R-curves) obtained frompressurized pipe tests and Single Edge Notched Tension (SENT) testsare also investigated. A R-curve from SENT tests shows goodagreement with that from pipe tests. Therefore, it is possible to use theR-curve of a SENT specimen as that of a pressurized pipe specimen.According to these results, the critical strain on ductile crack initiationand leakage of the pressurized pipe was predicted, and it is verified thatpredicted critical strain was well in agreement with an experimentalresult.
机译：本文介绍了内部压力对延性断裂行为的影响，该行为通过机械加工的表面缺口进行了三个加压和非加压管道张力测试。特别是，从切口尖端的有效开口位移的方面着眼于延性裂纹萌生的研究。内压对从表面缺口开始的延性裂纹萌生的影响可以忽略不计。另一方面，随着内部压力的增加，裂纹驱动力变高。还研究了从加压管试验和单边缺口拉力（SENT）试验获得的延性抗撕裂曲线（R曲线）。 SENT测试的R曲线与管道测试的R曲线显示出良好的一致性。因此，可以将SENT试件的R曲线用作加压管试样的R曲线。根据这些结果，预测了加压管的延性裂纹萌生和泄漏的临界应变，并验证了预测的临界应变为与实验结果非常吻合。

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