纤维缠绕增强复合管在轴对称荷载下的力学行为研究

发布时间：2018-02-03 15:42

本文关键词： 纤维缠绕增强复合管拉伸内压拉伸与内压组合荷载理论计算有限元分析　出处：《浙江大学》2015年硕士论文　论文类型：学位论文

【摘要】：管道运输是输送石油和天然气的主要方式,随着我国加大对油气资源的开发利用,管道在我国的使用将会继续增加。纤维缠绕增强复合管(RTP管)因其耐腐蚀、耐高压、柔韧性好等优良性能成为近年来油气运输的新选择。RTP管由高性能增强纤维和热塑性材料两种材料复合而成,结构复杂,并且RTP管在安装和服役过程中会承受多种荷载,因此针对RTP管在不同荷载作用下的力学行为分析十分必要。本文针对RTP管在轴对称荷载作用下的力学行为采用理论方法和有限元方法进行研究,所涉及的轴对称荷载包括：拉伸,内压,拉伸与内压组合荷载。本文所做工作主要包括以下方面： (1)本文借鉴光缆在拉扭荷载下的理论模型,提出了研究RTP管在三种轴对称荷载下力学行为的理论方法。在该理论方法中对RTP管截面进行了简化,考虑了材料非线性,分析了缠绕纤维变形、管道截面变形,利用势能驻值原理建立平衡方程,并采用数值方法进行求解。 (2)本文利用ABAQUS有限元软件建立模型,采用与理论方法一致的边界条件和加载方式,分别模拟RTP管在三种轴对称荷载下的力学行为,通过有限元结果与理论结果的对比,验证理论方法的有效性。 (3)通过对影响RTP管性能的重要参数,如径厚比、缠绕角度、纤维数量等进行敏感性分析,可以得到不同参数对RTP管力学性能的影响。通过理论和有限元方法的分析计算,不但能得到RTP管的荷载位移曲线、截面变形等,而且能得到单根缠绕纤维的变化形态、应力分布等,从而可以对RTP管中不同材料的工作机制有更深刻的了解。而针对重要的管道参数进行敏感性分析,可以把握影响管道性能的多方面因素,从而为管道的设计和应用提供有价值的建议。
[Abstract]:Pipeline transportation is the main way to transport oil and natural gas, with the increasing development and utilization of oil and gas resources in our country, our country continue to increase in the pipeline will be used. Fiber reinforced composite pipe (RTP pipe) because of its corrosion resistance, high pressure resistance, good flexibility and excellent performance in recent years become a new choice of.RTP oil and gas transport pipe of reinforced fiber and thermoplastic composite materials of two kinds of materials, the high performance of complex structure, and the RTP tube in the process of installation and service to be able to withstand a variety of load, so the mechanical behaviors of RTP tube under different load of ten points.
In this paper, the mechanical behavior of RTP tube under axisymmetric load is studied by theoretical method and finite element method. The axisymmetric loads involved include tensile, internal pressure, tensile and internal pressure combined load.
(1) based on the theoretical model in tension torsion loading cable, the paper presents a method in three kinds of mechanical behavior under axisymmetric loading. In this study RTP theory method for RTP tube section is simplified, considering material nonlinear analysis, the fiber cross section of the pipeline deformation, deformation, using the potential energy the value of balance equation principle, and solved by numerical method.
(2) in this paper, ABAQUS finite element software is used to establish the model, and the boundary conditions and loading modes which are consistent with the theoretical method are used to simulate the mechanical behavior of RTP tube under three kinds of axisymmetrical loads. The validity of the theoretical method is verified by the comparison between the finite element results and the theoretical results.
(3) through the sensitivity analysis of important parameters that affect the performance of RTP tube, such as diameter thickness ratio, winding angle and fiber number, we can get the effect of different parameters on the mechanical properties of RTP pipe.
Through theoretical analysis and finite element calculation method, not only can get the load displacement curves of RTP pipe, the cross section deformation, and can get the morphological change of single fiber, stress distribution, so we can have a better understanding of the working mechanism of different materials in RTP pipes. According to the important parameters of pipeline sensitivity analysis, can grasp the factors affecting pipeline performance, so as to provide valuable suggestions for the design and application of pipeline.

【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE973

【参考文献】