The Stress Analysis And Optimization Research Of Steel Plastic Transtion Joint

With the application of polyethylene(PE)pipe in urban pipe network system.The use of steel plastic transition joint has become an inevitable trend.But the stress analysis of the steel plastic transition joint under different working conditions,and the research of nonlinearity caused by the change has not been paid enough attention.There for,in this paper,the stress analysis and optimization of the steel plastic transition joints are deeply studied.At the beginning of this paper the types and application scope of the steel plastic joint are introduced.Furthermore,the working principle of the steel plastic conversion joint is described;Then the basic theory of nonlinearity and contact mechanics are studied;Finally,the finite element software ANSYS WORKBENCH is used to build the model of steel plastic joint.The grid is divided by sweeping method,design Contact pairs and boundary conditions,the stress distribution of joints under different working conditions was simulated.According to the numerical simulation results,the influence of different working conditions on the safety and service life of the steel plastic joint is analyzed,the results are as follows:In the buried state,the maximum equivalent stress of bending moment and internal pressure loads are 1.9065e7 Pa,2.1641e7 Pa respectively;under the unburied condition,the maximum equivalent stress of bending load and bending moment and the internal pressure load are2.0286e7 Pa,2.296e7 Pa;under different working conditions,with the increase of the number of grooves,the equivalent stress value of the steel plastic transition joint decreases gradually;and the maximum equivalent stress value of the steel-plastic conversion joint of the trapezoidal groove is smaller than that of the circular groove;under the condition of different load,the maximum equivalent stress value of the steel plastic transition joint of under the ground is smaller than that under the unburied condition.