聚乙烯及其复合管电熔接头的失效模式与爆破压力研究

Study on Failure Mode and Burst Pressure of Electrofusion Joints of Polyethylene and Its Composite Pipes

通过Abaqus有限元分析软件,建立聚乙烯(PE)及其复合管电熔接头受内压和轴向力作用下的有限元模型,分析电熔接头的应力分布规律,研究管材种类、强度对电熔接头的失效模式与爆破压力的影响规律,结合电熔接头短时爆破实验验证模型的有效性。结果表明,PE管电熔接头的失效模式是管材韧性破坏;增强热塑性复合管(RTP)电熔接头的失效模式和爆破压力受管材强度影响,随强度增加,失效模式由管材破坏转变为电熔套筒破坏,爆破压力随RTP管材强度增加先升高,随后趋于稳定。

To analyze the stress distributions of electrofusion joints of polyethylene (PE) and its composite pipes, a finite element model of these joints subjected to internal pressure and axial force was established by means of the Abaqus finite element analysis software. The effects of pipe type and strength on the failure mode and burst pressure of electrofusion joints were investigated, and then short-term burst tests were conducted to verify the model. The results indicated that failure mode of electrofusion joint of PE pipe presented a ductile failure. The strength of reinforced thermoplastic pipe (RTP) influenced the failure mode and burst pressure of electrofusion joints. The failure mode transferred from pipe failure to electrofusion coupler failure with an increase of strength. The burst pressure increased with the strength of RTP at first and then tended to became stable.