深海夹层管复合结构非线性屈曲失稳机理研究
发布时间：2018-08-16 09:49
【摘要】：随着海洋油气资源的勘探开发迈向深水和超深水海域,对海底油气管道也提出了更高的要求。传统的单层海底管道由于浮重度较大,绝热性能较差,已不适合应用于于深水和超深水海域。夹层管复合结构是近年才发展起来的海底管束技术,在深海油气资源开发和输运中具有显著的优势。深水海底管道在安装和服役期间,需要承受巨大的外部静水压力和不同程度的弯曲作用,同时材料非线性和几何非线性的存在使得管道受力更为复杂。深海高压环境容易诱发管道发生局部屈曲,在静水压力作用下屈曲将沿管道轴向传播,导致整条管道发生失稳破坏,造成重大的经济损失和生态影响。因此,开展深海夹层管复合结构非线性屈曲失稳机理研究具有重大的工程意义。 本文采用具有较高结构强度和良好保温绝热性能的聚丙烯作为夹芯层材料,通过试验测得聚丙烯夹芯层与内外钢管之间的粘结特性,考虑不同的层间粘结性能,分别对夹层管在外压和弯曲作用下的屈曲失稳进行了精确的数值模拟分析,主要研究工作概述为以下几个方面： (1)夹层管层间粘结性能试验研究。通过单轴拉伸试验和单轴压缩试验测得聚丙烯材料的应力应变关系曲线,设计不同的试验方案分别研究夹层管层间环向粘结性能和轴向粘结性能,探究了不同黏结剂和接触面粗糙程度对层间粘结性能的影响。 (2)外压作用下夹层管非线性屈曲失稳研究。将外压作用下夹层管的屈曲失稳简化为平面应变问题,运用有限元分析软件ABAQUS建立了相应的数值模型,采用节点间非线性弹簧模拟夹芯层与内外管之间的粘结性能,通过广泛的参数化分析,研究了层间粘结性能、钢管初始几何缺陷、截面几何构型以及材料特性等因素对夹层管屈曲失稳的影响。 (3)纯弯作用下夹层管非线性屈曲失稳研究。建立了夹层管在纯弯作用下的三维数值模型,通过一系列的参数敏感性分析,研究了管道长度、层间粘结性能、截面几何构型以及材料特性等因素对夹层管屈曲失稳的影响。 研究结果表明,无论是外压,还是弯曲作用下,夹层管的屈曲性能相比传统单层管都有较大幅度的提升；外压作用下,层间粘结性能对夹层管屈曲性能影响较大,而弯曲作用下,层间粘结性能对夹层管屈曲性能影响较小；夹层管截面几何构型以及内外管材料特性对夹层管屈曲性能影响较为显著。
[Abstract]:With the exploration and development of offshore oil and gas resources moving into deep and ultra deep water areas, higher requirements for submarine oil and gas pipelines have been put forward. The traditional single-layer submarine pipeline is not suitable for deep water and ultra deep water because of its large floating degree and poor adiabatic performance. Sandwich pipe composite structure is a kind of submarine pipe bundle technology developed in recent years. It has obvious advantages in the exploitation and transportation of deep sea oil and gas resources. During the installation and service of deep-water submarine pipeline, it is necessary to bear huge external hydrostatic pressure and varying degrees of bending, and the existence of material nonlinearity and geometric nonlinearity makes the pipeline force more complicated. The deep sea high pressure environment can easily induce the local buckling of the pipeline, and the buckling will propagate along the pipeline axis under hydrostatic pressure, resulting in the instability of the whole pipeline, resulting in significant economic losses and ecological effects. Therefore, it is of great engineering significance to study the nonlinear buckling failure mechanism of deep sea sandwich tube composite structure. In this paper, polypropylene with high structural strength and good thermal insulation property is used as sandwich layer material. The bonding characteristics between sandwich layer and inner and outer steel pipe are measured by experiments, and different interlaminar bonding properties are considered. The buckling instability of sandwich tube under external pressure and bending is analyzed by numerical simulation. The main research work is summarized as follows: (1) Experimental study on interlaminar bond behavior of sandwich tube. The stress-strain curves of polypropylene were measured by uniaxial tensile test and uniaxial compression test. The effects of different binders and roughness of contact surface on interlaminar bond properties were investigated. (2) nonlinear buckling instability of sandwich tubes under external pressure was investigated. The buckling instability of sandwich tube under external pressure is simplified as a plane strain problem. The corresponding numerical model is established by using the finite element analysis software ABAQUS, and the bond performance between the sandwich layer and the inner and outer tube is simulated by nonlinear spring between the nodes. Based on the extensive parametric analysis, the interlaminar bond properties and initial geometric defects of the steel pipe are studied. The effect of geometric configuration and material characteristics on buckling instability of sandwich tubes. (3) nonlinear buckling instability of sandwich tubes under pure bending. The three-dimensional numerical model of sandwich tube under pure bending is established. Through a series of parameter sensitivity analysis, the influence of pipe length, interlaminar bond property, section geometry configuration and material characteristics on buckling instability of sandwich tube is studied. The results show that the buckling behavior of the sandwich tube is much higher than that of the traditional single-layer tube under the external pressure and bending, and the interlaminar bond property has a great influence on the buckling performance of the sandwich tube. However, the effect of interlaminar bonding on the buckling behavior of sandwich tube is small, and the geometric configuration of sandwich tube section and the characteristics of inner and outer tube material have a significant effect on the buckling performance of sandwich tube.
【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
本文编号：2185623
[Abstract]:With the exploration and development of offshore oil and gas resources moving into deep and ultra deep water areas, higher requirements for submarine oil and gas pipelines have been put forward. The traditional single-layer submarine pipeline is not suitable for deep water and ultra deep water because of its large floating degree and poor adiabatic performance. Sandwich pipe composite structure is a kind of submarine pipe bundle technology developed in recent years. It has obvious advantages in the exploitation and transportation of deep sea oil and gas resources. During the installation and service of deep-water submarine pipeline, it is necessary to bear huge external hydrostatic pressure and varying degrees of bending, and the existence of material nonlinearity and geometric nonlinearity makes the pipeline force more complicated. The deep sea high pressure environment can easily induce the local buckling of the pipeline, and the buckling will propagate along the pipeline axis under hydrostatic pressure, resulting in the instability of the whole pipeline, resulting in significant economic losses and ecological effects. Therefore, it is of great engineering significance to study the nonlinear buckling failure mechanism of deep sea sandwich tube composite structure. In this paper, polypropylene with high structural strength and good thermal insulation property is used as sandwich layer material. The bonding characteristics between sandwich layer and inner and outer steel pipe are measured by experiments, and different interlaminar bonding properties are considered. The buckling instability of sandwich tube under external pressure and bending is analyzed by numerical simulation. The main research work is summarized as follows: (1) Experimental study on interlaminar bond behavior of sandwich tube. The stress-strain curves of polypropylene were measured by uniaxial tensile test and uniaxial compression test. The effects of different binders and roughness of contact surface on interlaminar bond properties were investigated. (2) nonlinear buckling instability of sandwich tubes under external pressure was investigated. The buckling instability of sandwich tube under external pressure is simplified as a plane strain problem. The corresponding numerical model is established by using the finite element analysis software ABAQUS, and the bond performance between the sandwich layer and the inner and outer tube is simulated by nonlinear spring between the nodes. Based on the extensive parametric analysis, the interlaminar bond properties and initial geometric defects of the steel pipe are studied. The effect of geometric configuration and material characteristics on buckling instability of sandwich tubes. (3) nonlinear buckling instability of sandwich tubes under pure bending. The three-dimensional numerical model of sandwich tube under pure bending is established. Through a series of parameter sensitivity analysis, the influence of pipe length, interlaminar bond property, section geometry configuration and material characteristics on buckling instability of sandwich tube is studied. The results show that the buckling behavior of the sandwich tube is much higher than that of the traditional single-layer tube under the external pressure and bending, and the interlaminar bond property has a great influence on the buckling performance of the sandwich tube. However, the effect of interlaminar bonding on the buckling behavior of sandwich tube is small, and the geometric configuration of sandwich tube section and the characteristics of inner and outer tube material have a significant effect on the buckling performance of sandwich tube.
【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】
相关期刊论文 前2条
1 李志刚;王琮;何宁;赵冬岩;;An Overview of Deepwater Pipeline Laying Technology[J];China Ocean Engineering;2008年03期
2 赵天奉;段梦兰;潘晓东;;刚性连接双层海底管道高温侧向屈曲分析方法研究[J];海洋工程;2008年03期
，本文编号：2185623
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