复合柔性软管用HDPE的蠕变性能
发布时间:2018-03-18 12:05
本文选题:复合柔性软管 切入点:压缩蠕变 出处:《海洋工程装备与技术》2016年02期 论文类型:期刊论文
【摘要】:海洋复合柔性软管内衬层材料的蠕变行为可能造成软管内层厚度的过度减少,从而导致内衬层结构受损。采用有限元分析方法对内衬层高密度聚乙烯(HDPE)材料的受力情况进行分析,结果表明:在20 MPa内压下,不考虑软管各层之间的相互作用时,内衬层受到的径向压应力为11 MPa;考虑HDPE内衬层与外层扁钢的实际接触状态,内衬层受到的径向压应力为19.9 MPa。研究了HDPE内衬层材料在11 MPa下的压缩蠕变行为,计算得到HDPE内衬层在60℃、30年设计寿命下,压缩蠕变量预期为17.5%。设计了带凹槽的侧向约束压缩蠕变工装,模拟了内衬层HDPE和其外层扁钢的接触形式,测试了20 MPa下HDPE内衬层在不同温度的侧向约束压缩蠕变性能,计算了HDPE在其30年的设计寿命下,厚度减薄率预期为6.6%。通过内衬层的厚度和扁钢缠绕缝隙的尺寸,可计算由于蠕变而造成的缝隙填充量,对于HDPE复合软管的结构设计具有指导意义。
[Abstract]:Creep behavior of marine composite flexible hose lining material may result in excessive reduction in the thickness of the inner layer of the hose. The finite element analysis method is used to analyze the stress situation of HDPE liner material. The results show that when the internal pressure is 20 MPa, the interaction between the different layers of the hose is not considered. The radial compressive stress of inner liner is 11 MPA, considering the actual contact state between HDPE liner and outer flat steel, the radial compression stress of inner liner is 19.9 MPA. The compressive creep behavior of HDPE liner material at 11 MPa is studied. At 60 鈩,
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