A numerical investigation into the effect of pressure on holes and cracks in water supply pipes
A numerical investigation into the effect of pressure on holes and cracks in water supply pipes
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DOI：
10.1080/15730620903447613
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发表时间：
2010-02
影响因子：
2.7
通讯作者：
A. Cassa;Jean-Pierre van Zyl;R. Laubscher
中科院分区：
文献类型：
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作者：
A. Cassa;Jean-Pierre van Zyl;R. Laubscher
管道中的水压对管道中的泄漏开口的泄漏速率的影响是影响泄漏的主要因素之一，这一点仍然没有得到充分的理解。在这项研究中，不同类型的泄漏开口（圆孔和纵向和周向裂纹）的行为进行了研究，不同的管道材料（uPVC，钢，铸铁和石棉水泥）使用有限元分析。假设为线性弹性行为。研究发现：（1）管道应力受泄漏口的影响很大，在泄漏口附近很容易超过材料的屈服强度;（2）圆孔随压力的膨胀最小，其次是环向裂纹，然后是纵向裂纹;（3）所有泄漏口的面积随压力线性增加;（4）纵向管应力影响圆孔和环向裂纹的行为，而不影响纵向裂纹的行为;（5）压力对泄漏开口的影响随孔径或裂纹长度的增加而呈指数增加。提出了一个方程，模拟压力对单个泄漏的影响。
The effect of water pressure in a pipe on the rate of leakage from leak openings in the pipe is one of the main factors influencing leakage that is still not understood sufficiently. In this study, the behaviours of different types of leak openings (round holes and longitudinal and circumferential cracks) on pressurized pipes were investigated for different pipe materials (uPVC, steel, cast iron and asbestos cement) using finite element analysis. Linear elastic behaviour was assumed. The study found that (1) pipe stresses are significantly affected by a leak opening, and can easily exceed the material's yield strength in the vicinity of the opening; (2) round holes show the smallest expansion with pressure, followed by circumferential cracks and then longitudinal cracks; (3) the areas of all leak openings increase linearly with pressure; (4) longitudinal pipe stresses affect the behaviours of round holes and circumferential cracks, but not that of longitudinal cracks; and (5) the effect of pressure on a leak opening increases exponentially with increasing hole diameter or crack length. An equation is proposed for modelling the effect of pressure on individual leaks.