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首页> 外文期刊>Engineering failure analysis >Structural integrity assessment of defected high density poly-ethylene pipe: Burst test and finite element analysis based on J-integral criterion
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Structural integrity assessment of defected high density poly-ethylene pipe: Burst test and finite element analysis based on J-integral criterion

机译：有缺陷的高密度聚乙烯管道的结构完整性评估：基于J积分准则的爆破试验和有限元分析

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The main objective of this study was to analyze the integrity of a defective high density polyethylene (HDPE) pipe by computing the J-integral. To this end, an experimental test was performed to measure the toughness and to determine the mechanical behavior of the HDPE. Many burst tests were achieved on longitudinally notched pipe specimens subjected to internal pressure. The defect was machined by a disc cutter with 0.5 mm thickness. So the notch geometry was given by the disc cutter penetration in the pipe wall. Numerical simulations based on the computation of the J-integral were used to analyze the fracture behavior of these structures (notched pipe and pre-cracked pipe). The numerical results were discussed and compared with the experimental tests. Using the critical value of J-integral, the numerical simulations allowed determining the crack initiation pressure and the opening stress in the vicinity of the defect root. Numerical results show that there is a gap between the crack initiation pressures of pre-cracked pipe and those of the notched pipe. This gap increases when the defect is deeper than half of the wall thickness. These pressures decrease parabolically with the defect depth. (C) 2015 Elsevier Ltd. All rights reserved.
机译：这项研究的主要目的是通过计算J积分来分析有缺陷的高密度聚乙烯（HDPE）管的完整性。为此，进行了实验测试以测量韧性并确定HDPE的机械性能。在承受内压的纵向切口管道试件上实现了许多爆破测试。用厚度为0.5mm的圆盘切割机加工缺陷。因此，槽口的几何形状由圆盘切刀在管壁中的穿透程度决定。基于J积分计算的数值模拟被用来分析这些结构（缺口管和预裂管）的断裂行为。讨论了数值结果，并与实验结果进行了比较。通过使用J积分的临界值，数值模拟可以确定裂纹根部附近的裂纹萌生压力和张应力。数值结果表明，预裂管与缺口管的裂纹萌生压力之间存在一定的差距。当缺陷深于壁厚的一半时，此间隙会增加。这些压力随缺陷深度呈抛物线状下降。 （C）2015 Elsevier Ltd.保留所有权利。

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