凹陷管道水压爆破实验分析

为了研究凹陷管道的失效行为与机理，进行了含凹陷管道的水压爆破实验，对整个爆破过程凹陷管道的变形情况、裂口特征以及应变响应进行了分析。结果表明：实验所制6%OD深度的凹陷不影响管道的承载能力，管道爆破方式为直焊缝撕裂，屈服压力34.2MPa，爆破压力36.8MPa；远离凹陷中心超过200mm的区域，应变响应与凹陷无关；凹陷的存在改变了凹陷以及周围的应变响应状态，产生了较大的应变，容易导致管道疲劳。

Analysis on Dented Pipeline for Burst Experiment

The hydraulic burst experiment was conducted on the dented pipeline to study the failure behaviors and mechanisms of dented pipeline. During the whole experiment, the deformation, crack characteristics and strain response of the dented pipeline were analyzed. The results show that the 6%OD depth of the dent does not affect the bearing capacity of the pipeline. The burst mode of the pipeline is straight weld tearing, and the yield pressure is 34.2MPa, burst pressure is 36.8MPa. The strain response of the area more than 200mm away from the center of the dent has nothing to do with the dent. The existence of the dent changes the state of the strain response of the dent and the surrounding area, results in large strain, which is easy to cause pipeline fatigue failure.