海洋柔性管道抗拉铠装钢丝加工力学行为分析

发布时间：2018-03-25 02:29

本文选题：海洋柔性管道　切入点：抗拉铠装钢丝　出处：《大连理工大学》2015年硕士论文

【摘要】：海洋柔性管道是海洋油气开发的重要装备之一,随着海洋油气资源开发逐渐向深水迈进,对柔性管道的抗拉性能有了更高要求。而柔性管道结构中主要由螺旋缠绕形式的抗拉铠装钢丝提供抗拉伸能力。随着水深加深,需要设计更厚的铠装钢丝,这为抗拉铠装钢丝的加工缠绕成型带来挑战,需要精确预测钢丝成型过程中的力学行为,进而调整工艺参数。本文对海洋柔性管道抗拉铠装钢丝的加工装备与工作原理进行分析,总结提炼出其中的关键技术问题,即钢丝缠绕成型问题,并进一步确定缠绕成型中的关键工艺参数,即钢丝预张力。首先建立单根钢丝缠绕圆柱的加工理论模型,对加工预张力的上限值进行分析。同时基于材料弹塑性,建立铠装钢丝缠绕成型的三维有限元数值模型,以8寸柔性管道抗拉铠装钢丝缠绕成型为例,对理论模型的合理性进行验证；对满足缠紧要求的预张力下限值范围进行分析,并对缠绕过程中的钢丝应力状态进行预测。此外,对钢丝连续缠绕多个圆柱滚筒的力学行为进行分析,对考虑塑性应变前后的最大加工应力进行对比讨论。本文对柔性管道抗拉铠装钢丝制造过程中提出的理论及数值模型,为柔性管道抗拉铠装层的加工制造提供技术支撑,同时也为海洋柔性管道截面设计提供理论支持。
[Abstract]:Offshore flexible pipeline is one of the important equipments for offshore oil and gas development. The tensile resistance of flexible pipeline is higher than that of flexible pipeline. But in flexible pipeline structure, tensile resistance is mainly provided by tensile sheathed wire in spiral winding form. As the depth of water deepens, a thicker sheathed steel wire needs to be designed. This poses a challenge to the processing and winding of tensile sheathed steel wire, and requires accurate prediction of mechanical behavior during the forming process of steel wire. In this paper, the processing equipment and working principle of tensile armored steel wire for offshore flexible pipeline are analyzed, and the key technical problems, I. e., the winding forming of steel wire, are summarized and abstracted. Furthermore, the key technological parameters in winding molding, namely wire pretension, are determined. Firstly, the theoretical model of single steel wire winding cylinder is established, and the upper limit value of processing pretension is analyzed. At the same time, based on material elastoplasticity, A three-dimensional finite element numerical model for the winding forming of armored steel wire is established. The rationality of the theoretical model is verified by taking the winding forming of 8 inch flexible pipeline as an example, and the range of the lower limit of pretension to meet the requirements of winding is analyzed. The stress state of steel wire during winding is predicted. In addition, the mechanical behavior of continuous winding of several cylindrical rollers is analyzed. The maximum processing stress before and after considering plastic strain is compared and discussed. In this paper, the theory and numerical model proposed in the manufacturing process of flexible pipeline tensile armored steel wire provide technical support for the processing and manufacture of flexible pipeline tensile armor layer. At the same time, it also provides theoretical support for the section design of marine flexible pipeline.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE973.92

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