双金属衬里复合管制管过程紧密度影响因素研究

目前关于双金属衬里复合管的研究大多没有考虑现场制管时管端焊缝环的影响,且制管防腐工艺中材料的力学性能随温度变化,对双金属衬里复合管的紧密度也有重要影响.为此,建立了"两步法"双金属衬里复合管制管过程力学分析有限元模型,对制管过程中加压→泄压→升温→冷却阶段进行模拟仿真.分析结果表明:所建模型可以准确地模拟衬管-基管紧密...

Study on the Influencing Factors of Compactness of Bimetal-Lined Composite Pipe During Forming Process

At present,most of the current researches on bimetal-lined composite pipes do not consider the influence of the pipe end weld ring during the pipe making process,and the mechanical properties of the materials in the pipe making anticorrosion process change with temperature,presenting significant influence on the compactness of the bimetal-lined composite pipe.For this reason,a"two-step method"finite element model for the mechanics analysis of the bimetal-lined composite pipe making process is established to simulate the pressure loading-pressure releasing-heating-cooling stage of the pipe making process.The analysis results show that the model can accurately simulate the change process of the liner-base pipe compactness.Considering that the axially coupled binding constraint relationship model of the weld is quite different from the plane strain model,the pipe ends of the two pipes of the binding constraint model are shortened at the same time during the pressure loading process,which will cause changes in the radial deformation behavior of the liner and the base pipe before and after contact,and ultimately affect the compactness and its distribution.The compactness increases with the loading internal pressure.Greater difference in expansion coefficient between the two materials leads to smaller compactness.Appropriately increasing the internal pressure and reducing the difference in expansion coefficient will help improve compactness.The results obtained can provide references for the design and application of bimetal-lined composite pipes.