Numerical Simulation Of Failure Of FRP Pipe Flange In Oilfield

Glass fiber reinforced plastic(GFRP,commonly known as glass fiber reinforced plastic),has the characteristics of light weight,low roughness,corrosion resistance,strong temperature resistance,low thermal conductivity,and strong wear resistance.It has been obtained in various petroleum production and transportation related fields at home and abroad.A large-scale application.In practical applications,wax deposition also exists inside the glass steel pipe,which increases the internal energy consumption and increases the economic cost of pipeline transportation.However,the current research on the mechanism and characteristics of wax deposition on the inner surface of FRP pipes is obviously not enough to be widely used in the background,so it is of high guiding significance to carry out the research on the wax-FRP surface bonding and separation mechanism.Based on this,this article conducts the following research on the inner surface of DN50 FRP pipe:The research status of FRP pipe at home and abroad is introduced,and the shear stress and debonding force at any point on the interface of wax-fiberglass steel pipe are theoretically calculated,and the mechanical properties of DN50 FRP pipe are measured.According to the composite material interface bonding theory,the possible wax-glass fiber reinforced plastic interface mechanism theory is summarized and analyzed,and the corresponding cold finger experiment,pull-off adhesion experiment and shear force measurement experiment are designed according to the mechanical locking theory and chemical bonding theory.The three directions of wax combination,vertical and shear direction peeling discuss the actual effect and dominant position of the mechanism theory.The Static Structural module and the Fluent module of ANSYS software were used to establish the numerical simulation of the pull-off adhesion experiment and the numerical simulation of the shear force of the wax block attached to the inner wall of the pipeline.The influence of the mechanism theory was further discussed from the internal force of the wax block,and the wax in the pipeline was further discussed.The corresponding mathematical model is established under the force of the block.The results show that both the mechanical locking theory and the chemical bonding theory affect the wax-FRP bonding interface,specifically the separation in the bonding,vertical and shear directions.The dominant mechanism theories are the mechanical locking theory and the chemical bonding theory.And mechanical locking theory.