聚乙烯管道热熔接头可靠性评价方法研究

Research progress on reliability assessment methods of polyethylene pipes fusion joint

介绍了目前国内外聚乙烯管道熔接接头可靠性评价的短期力学性能和长期耐慢速裂纹拓展的主要检测方法及其适用性研究。近年来,超声波相控阵被广泛应用于熔接接头可靠性无损检测,其自动化检测和结果智能化判定是一个重要的研究方向。目前我国标准中对熔接接头可靠性检测的项目较少,为使聚乙烯承压管道向厚壁、大口径、高耐压、耐高温、长寿命和更安全的方向发展,需要建立完整、适用的熔接接头可靠性表征和测试方法,建立加速试验和采用较小试样替代完整管材试样的方法。最后,展望了利用现代科技手段和装备实现原材料的性能受控地传递到熔接接头上,促进聚乙烯管道的应用技术随着材料的创新而不断发展。

This manuscript first introduces the main methods for reliability evaluation of polyethylene pipe butt-fused joints in terms of short-term mechanical performance and long-term slow crack growth resistance capability.In recent years,phased-array ultrasonic have been widely used in non-destructive testing of the reliability of welded joints.Its testing automation and intelligent qualification technologies have become a mainstream research direction.At present,there are few tests on the reliability of welded joints in Chinese standards.In order to make polyethylene pressure-bearing pipelines developed in the direction of thick-walled,large-diameter,high-pressure resistance,extreme temperature application,long service life,and more safe,the reliability assessment of welded joints is required.The complete testing methods and package including accelerated testing,use of smaller samples instead of pipeline samples are hoped to be established.Finally,expect to see the new technologies used to transfer the characters of material to fused joints to facilitate the development of pipes application together with materials innovation.