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Effects of External Loads on the Reliability of Welded Pipe with Circumferential Crack

机译：外部载荷对周向裂纹焊管可靠性的影响

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摘要

The reliability of welded pressure pipe with circumferential surface crack was calculated by using 3-D stochastic finite element method. This method has overcome the shortcomings of conservative results in safety assessment with deterministic fracture mechanics method. The calculation of reliability was based on 3-D elastic-plastic stochastic finite element program which was developed by ourselves. The effects of variables such as bending moment, the inner pressure on the structure reliability were discussed. The calculation results indicate that the bending moment has great effect on the reliability of the welded pipe, and the inner pressure has little effect on the reliability of the welded pipe if the inner pressure is less than 10MPa. If the mean value of the inner pressure changed from 0.5MPa to 30MPa, the failure probability will changes from 10~(-6) to 10~(-2). The bending moment also has great effect on the reliability. When the mean value of moment is changed from 10000 Nm to 15000 Nm, the failure probability of the welded pipe increases dramatically for the same inner pressure. Irrespective of the changing of moment, the pipe has higher reliability if the inner pressure is less than 6 MPa. The method has put forward a new way for safety assessment of welded pipe with circumferential surface crack.
机译：采用3-D随机有限元法计算了具有周向表面裂纹的压力焊管的可靠性。该方法克服了确定性断裂力学方法在安全性评估中保守结果的缺点。可靠性的计算基于我们自己开发的3D弹塑性随机有限元程序。讨论了弯矩，内压等变量对结构可靠性的影响。计算结果表明，弯矩对焊接管的可靠性影响很大，而内部压力小于10MPa时，内部压力对焊接管的可靠性影响很小。如果内部压力的平均值从0.5MPa变为30MPa，则失效概率将从10〜（-6）变为10〜（-2）。弯矩也对可靠性有很大影响。当弯矩的平均值从10000 Nm更改为15000 Nm时，在相同的内压下，焊接管的失效概率会急剧增加。如果力矩小于6 MPa，则无论弯矩如何变化，管道的可靠性都更高。该方法提出了一种新的方法，可以对具有周向表面裂纹的焊管进行安全性评估。

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