Bai Chunmei, Lin Rong, Lai Huan Sheng
Architecture and Civil Engineering Institute, Guangdong University of Petrochemical Technology, Maoming 525000, China.
School of Chemical Engineering, Fuzhou University, Fuzhou 350116, China.
Polymers (Basel). 2024 Jun 26;16(13):1803. doi: 10.3390/polym16131803.
The utilization of high-density polyethylene (HDPE) pipes is prevalent in water transportation due to their exceptional durability, resistance to corrosion, and ease of installation. Traditionally, butt fusion welding has been employed to connect HDPE pipes. In this study, scanning electron microscopy (SEM) was utilized to examine the microstructure of butt fusion welded joints of HDPE pipes, while the stepped isostress method (SSM) was employed to investigate their creep behavior at 100 °C in ambient air. SEM results revealed a significant presence of craze or lamellae in the base material, whereas minimal occurrences of craze or lamellae were observed in the melt zone. The results obtained from the SSM indicated that the creep life of butt fusion welded joints of HDPE pipes was not adversely affected by the welding bead, and their creep life was no less than that of the base material when ductile creep failure occurred.
由于其卓越的耐用性、抗腐蚀性和易于安装的特点，高密度聚乙烯（HDPE）管道在输水领域得到广泛应用。传统上，对接热熔焊接一直用于连接HDPE管道。在本研究中，利用扫描电子显微镜（SEM）检查HDPE管道对接热熔焊接接头的微观结构，同时采用阶梯等应力法（SSM）研究其在100°C环境空气中的蠕变行为。SEM结果显示，母材中存在大量的银纹或片晶，而在熔合区观察到的银纹或片晶较少。SSM获得的结果表明，HDPE管道对接热熔焊接接头的蠕变寿命不受焊缝的不利影响，并且当发生延性蠕变失效时，其蠕变寿命不低于母材。
