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钢丝缠绕增强塑料复合管(PSP)是我国自主研发的一种高新技术产品。由于基体高密度聚乙烯(HDPE)的粘弹性特性,PSP呈现出时间相关的力学行为。提出一个PSP线粘弹性结构力学模型,研究其各层应力、应变随时间变化规律;对PSP样管进行蠕变试验研究表明:在恒定内压下,周向应变随时间变化缓慢,轴向应变随时间逐步增加,6000 min内应变增加较快,然后逐渐变缓,14000 min后轴向应变约增加了0.16%,理论结果与试验值吻合较好,证实了所建立的三层粘弹性模型可用来预测同类管材的蠕变特性。
Steel wire wound reinforced plastic composite pipe (PSP) is China’s independent research and development of a high-tech products. Due to the viscoelastic properties of matrix high-density polyethylene (HDPE), PSP exhibits time-dependent mechanical behavior. Proposed a mechanical model of the viscoelastic structure of PSP wire to study the variation of stress and strain at different layers with time. The creep test of PSP sample tube shows that under constant internal pressure, the circumferential strain changes slowly with time, and the axial strain The results show that the established three-layer viscoelastic model is valid with the increase of time, and the strain increases rapidly within 6000 min, then gradually becomes slower and the axial strain increases about 0.16% after 14000 min. To predict the creep characteristics of similar pipe.