Evolution of residual stress during whole forming process of submarine pipeline pipes
To study the evolution of residual stress during the whole forming process of submarine pipeline pipes,considering the inherit-ance of stress in the forming process,the finite element simulation of the JCO forming,welding and multi-directional compression calibra-tion of the pipeline pipe during the whole forming process was carried out by ABAQUS software.Firstly,the JCO forming process was sim-ulated,and then the welding process simulation of pipeline pipes after JCO forming was carried out based on the Gaussian surface heat source subroutine,and finally the multi-directional compression calibration forming process of the welded pipeline pipe was simulated,and the influence of the multi-directional compression calibration process parameters on the residual stress of the pipeline pipe was discussed.The simulation results show that the multi-directional compression calibration can realize the synchronous control of the geometry and residual stress of the pipeline pipes.Compared with the traditional 2 die-petals compression,the residual stress distribution of the pipeline pipe cali-brated by 4 die-petals and 8 die-petals is more uniform.The effect of friction factor on the residual stress is not obvious.Under the 4 die-petals,0.04 fraction factor and 1.6％compression ratio,the ovality of the pipeline pipe can reach 0.05％.Excepet for the welding heat af-fected zone,the maximum hoop residual stress on the inner and outer surfaces of the pipeline pipe is 28 and-45 MPa,respectively.And the mean Mises residual stress on the section is(120±20)MPa,and the mean Mises residual stress on the welded area and non-welded area is reduced by 79％and 30％,respectively.
万方数据
维普
