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首页> 外文期刊>Journal of Mechanical Science and Technology >Effects of defect size on failure of butt fusion welded MDPE pipe under tension
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Effects of defect size on failure of butt fusion welded MDPE pipe under tension

机译：缺陷尺寸对MDPE对接熔接MDPE管失效的影响

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摘要

Since medium density polyethylene (MDPE) pipes are increasingly used in the gas industry, welding defects are becoming a safety concern. In this study, butt fusion welded MDPE pipe joints with spherical and planar defects of various sizes were studied by experimental tensile tests and finite element analysis. These defects were considered for simulating lack of bonding during the welding. The tensile test results showed that pipe strength was not reduced by defects that were up to 15% of the pipe's thickness in size. On the other hand, when the size of the defect was increased to 30% and 45% of the thickness, the failure strain decreased considerably. Finite element analysis verified that the effects of steel defects inserted intentionally before welding are comparable to those of air defects, which are close to actual weld defect conditions. Hence, the experimental results obtained in this study can represent the actual situation. It is argued that a single welding defect with a maximum size smaller than 15% of the pipe's thickness can be accepted without compromising the structural integrity of the pipe during short term of usage not considering long term creep or slow crack growth.
机译：由于中密度聚乙烯（MDPE）管在天然气工业中越来越多地使用，因此焊接缺陷正成为安全问题。在这项研究中，通过实验拉伸试验和有限元分析研究了具有各种尺寸的球形和平面缺陷的对接熔接MDPE管接头。考虑这些缺陷是为了模拟焊接过程中粘结的缺乏。拉伸试验结果表明，不超过最大管道厚度15％的缺陷不会降低管道强度。另一方面，当缺陷的尺寸增加到厚度的30％和45％时，破坏应变显着降低。有限元分析证明，焊接前有意插入的钢缺陷的影响与空气缺陷的影响相当，这与实际的焊接缺陷条件相近。因此，在这项研究中获得的实验结果可以代表实际情况。有人认为，在不考虑长期蠕变或裂纹扩展缓慢的情况下，可以接受最大尺寸小于管道厚度15％的单个焊接缺陷，而不会损害管道的结构完整性。

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