Subjects: Mechanics >> Solid Mechanics submitted time 2024-04-19 Cooperative journals: 《应用力学学报》
Abstract：
Basalt fiber reinforced composite(BFRP)has the advantages of strong corrosion resistance,high specific strength and environmental protection.The correct evaluation of the reliability and bearing capacity of BFRP pipeline is the basis for its application in the field of high value-added oil and gas transportation.For composite pipes wound by the basalt fiber(BF),the strength of impregnated fiber bundles is obtained on a meso scale firstly.Then,both axial and circumferential specimens were cut from a pipe and the tensile strength of the two kinds of specimens were measured.Based on both experimental measurement and finite element simulation,damage evolution of structure layers of the pipe wall was studied under conditions of tension,compression and shearing,and the constitutive model of the structure layer is obtained.Finally,a finite element model of the BF-wound composite pipe was established,and influences of fiber performances on the pipe’s carrying capacity were studied.It is shown that the effective fiber content exerts a great influence on the bearing capacity of the pipe.It is important to reduce the dispersion of fiber reinforcement from aspects such as fiber production and pipe forming process for predicting load-bearing reliability accurately and promoting BF composites application in oil and gas pipeline field.
Subjects: Mechanics >> Solid Mechanics submitted time 2024-02-07 Cooperative journals: 《应用力学学报》
Abstract：
Small diameter pipelines are widely distributed in oil and gas fields,but the traditional corrosion detection methods are difficult and expensive,and the corrosion degree can only be quantitatively evaluated after the sampling points are excavated.In order to make up for this deficiency,quantitative evaluation under trenchless condition is realized:the magnetic signal characteristics of leakage magnetic field near corrosion defects are obtained by analyzing the magnetic dipole model; the relationship between the depth and width of corrosion defects and the magnetic signal is obtained by finite element simulation; SY/T 6151—2009 “evaluation method for corrosion damage of steel pipeline”,the defect width and depth parameters required for corrosion evaluation are combined with the magnetic dipole model theory to deduce the relationship between calculation and magnetic signal characteristic parameters,and a quantitative evaluation method for pipeline corrosion under trenchless condition by weak magnetic field detection is obtained,which is verified in an oil field pipeline project,and is suitable for Trenchless condition It provides a theoretical basis for the quantitative evaluation of pipeline corrosion detection.
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. submitted time 2023-11-10 Cooperative journals: 《应用力学学报》
Abstract： The buckling and post-buckling behaviors of an elastic rod subjected to both axial force and transverse cylindrical constraints are studied.The axial critical forces of sinusoidal buckling and spiral buckling of slender rod are analyzed by finite element simulation,and the discrimination method for critical point of sinusoidal and spiral buckling is proposed,which is verified by comparison with literature results.The influence of slenderness ratio and boundary conditions on the critical force is also investigated.The results show that the critical forces of sinusoidal buckling and spiral buckling increase with the decrease of the slenderness ratio of the rod.In a certain range of rod length,the influence of end constraint conditions on critical load and buckling mode is not negligible.While the influence of boundary conditions on the critical load can be ignored as the length of the rod is long enough.
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. submitted time 2023-11-10 Cooperative journals: 《应用力学学报》
Abstract： Due to the high pressure in the well and the repeated collision of cuttings,the shell of the rotary blowout preventer will crack,and further expansion of the crack will cause the shell to crack.In this paper,Paris formula is used to study the crack growth life,and the material constant of the Paris formula is determined by the fatigue crack growth rate test.The fatigue crack growth of the CT specimen is studied by finite element simulation.The influence of initial crack size,load size,and stress ratio on fatigue crack growth of rotary blowout preventer shell is analyzed.The analysis results show that the experimental results of fatigue crack growth rate are in good agreement with the finite element simulation results.With the increase of the initial crack size,the SIF of the crack front increases gradually,and the initial crack propagation depth also increases with the increase of stress amplitude and stress ratio,while the crack growth life decreases with the increase of crack length and load,and increases with the increase of stress ratio.The research results can provide a theoretical basis and a simulation process for studying the service life and maintenance of rotary blowout preventer.
Subjects: Mechanics >> Solid Mechanics submitted time 2023-06-21 Cooperative journals: 《应用力学学报》
Abstract：
Based on the principle of metal magnetic memory detection and the theory of force and magnetism,static analysis of the crack defects of the circumferential weld with different relative depths and the force and magnet coupling were carried out by using ANSYS.The magnetic induction intensity signal under different pipeline operating pressure and different crack relative depth was obtained.Using the Lissajous figure closed curve area formed by the girth weld crack magnetic field intensity gradient value K,quantitative analysis of the girth weld crack magnetic signal was carried out,and the relationship between the area of the closed area and the relative crack depth was found.The results show that this method can quantitatively express the relative depth of crack defects,and has good practical application value in the research on quantitative analysis of magnetic memory detection.
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