Analysis Of Mechanical Properties Of Shape Memory Alloy Pipe Mender

China has a vast land,and the uneven distribution of energy in various regions is especially obvious.However,the appearance of pipelines transporting natural gas and oil on the ground has solved the problem of insufficient energy supply in some regions.Corrosion and breakage of pipeline structures are inevitable in normal practical engineering applications.Then pipeline repair is particularly important.For example,pipeline repair by welding is a common method of pipeline repair,and it is also the most widely used method of repair.Although welding repair has many advantages,it can also paralyze the whole pipeline structure due to its exposed shortcomings,so these shortcomings cannot be ignored.Scholars and experts from various countries study other new pipeline repair methods.As one of them,shape memory alloy pipeline repair device uses its material characteristics to solve the shortcomings of traditional pipeline repair methods.Because of its safe and convenient construction and excellent repair performance,this repair device will be widely used in actual pipeline repair projects.The main research contents of this topic are as follows:Firstly,a new type of pipeline repair device is designed by using iron-based shape memory alloy connectors,rubber gasket rings,iron-based shape memory alloy nuts,iron-based shape memory alloy bolts,etc.The finite element software ABAQUS is used to carry out numerical simulation on the iron-based shape memory alloy patch,and temperature load is applied to the patch to simulate the process of high-temperature heating of the patch so as to repair the leaking pipeline.Then,axial load is applied to the structure of the prosthesis,and the internal force distribution of the prosthesis under the load is analyzed.And the main parameters affecting its radial stress.This paper also carries out high temperature and axial pull-out tests on the structure of the iron-based shape memory alloy repair device.Through the ultimate pull-out force separating the repaired steel pipe from the pipeline repair device,the relationship between the radial stress of the pipeline repair device and various parameters can be obtained.Through the comparison and analysis of numerical simulation and experimental results,it is found that the main factors affecting the shape memory alloy pipe repair device include interference,length of the repair device,wall thickness of the repair device,etc.By optimizing various parameters in the model,the mechanical properties of the repairer can be better improved and the repair effect can be improved.