Plastic Pipes Conference Association # 2023 Lake Buena Vista
Riwu Yao, Fengyao Ni, Jinkui Wu, Zhiyong Kong, Jianfeng Shi , Jinyang Zheng
Plastic pipelines have been widely used in various industries, such as gas and oil transmission and nuclear power plants. The safe operation of pipelines is a critical concern in applications, and structural health monitoring methods of plastic pipelines are attracting broad interest in both industry and academia. In this work, electrofusion joints were manufactured using short carbon fiber reinforced conductive composites (SCFRCCs), which can be made from recycled carbon fiber composites. The SCFRCCs joints were used for connecting steel wire-wrapped HDPE pipes, and the pipes in this study are 110 mm in diameter and have a wall thickness of 12 mm. A structural health monitoring method for plastic pipelines was then developed based on the piezoresistive behavior of SCFRCCs. By measuring the resistance of the SCFRCCs joints under internal pressure, it was found that the monitored resistance of the SCFRCCs joints followed closely the internal pressure change of the pipe joint, and the monitored results were stable after multiple cycles. The results showed that the monitoring method could provide a real-time response to the internal pressure changes of pipelines, and showed a sensitive resistance response to internal pressure. Furthermore, owing to the improved electrical conductivity of the SCFRCCs joints materials, the monitoring method exhibited an ability to capture the damage initiation and propagation inside the joints. A significant increase in monitored resistance was observed before the joint failure due to damage initiation and propagation inside the joint. The gentle increase in monitored resistance indicates that the SCFRCCs joint is structurally safe, while an obvious increase suggests damage initiation. The results indicate that the proposed SCFRCCs joints and the structural health monitoring method are promising in improving the safety and reliability of plastic pipelines.
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