Prediction of Collapse Stress for Pipes With Arbitrary Multiple Circumferential Surface Flaws
Prediction of Collapse Stress for Pipes With Arbitrary Multiple Circumferential Surface Flaws
复制标题
具有任意多个圆周表面缺陷的管道的塌陷应力预测
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
N. Cofie
中科院分区：
文献类型：
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作者：
Yinsheng Li;K. Hasegawa;K. Onizawa;N. Cofie
核电厂不锈钢管道系统在使用中检测到缺陷时，可采用ASMEXI或JSME S NA-1-2008等规范规定的极限载荷估算方法来评定管道的完整性。然而，在现行的规范中，只对含有单一缺陷的管道提供了极限载荷估算方法。在不锈钢管道系统的同一平面上，实际上检测到了多个独立的缺陷，如应力腐蚀裂纹。本文提出了管道同一平面内任意数量、任意分布的多个独立环向缺陷的失效估计公式。利用所提出的方法，将数值解与实验结果进行了比较，验证了模型的有效性，并给出了几个数值算例。
When a flaw is detected in a stainless steel piping system of a nuclear power plant during in-service inspection, the limit load estimation method provided in codes such as ASME Section XI or JSME S NA-1-2008 can be applied to evaluate the integrity of the pipe. However, in the current editions of these codes, a limit load estimation method is only provided for pipes containing a single flaw. Independent multiple flaws, such as stress corrosion cracks, have actually been detected in the same plane of stainless steel piping systems. In this paper, a failure estimation method by formula is proposed for any number and arbitrary distribution of multiple independent circumferential flaws in the same plane of a pipe. Using the proposed method, numerical solutions are compared with experimental results to validate the model, and several numerical examples are provided to show its effectiveness.