Finite Element Analysis of Stamped Tees Stress in Directly Buried Heating Pipeline

Abstract

In order to provide evidence for optimization design of directly buried heating pipeline tees, finite element models of tees with different ratios of branch-main pipe diameters had been established and simulated by structure analysis soft ANSYS. The change law of maximum equivalent stress values in pipe-nozzle intersection area had been obtained at same temperature, pressure loads and displacement constraints. The results show that maximum equivalent stress values of stamped tees are less than welded tees with same specifications. And stamped tees with lager fillet radius and local wall thickness can effectively decrease maximum equivalent stress values of pipe-nozzle intersection area.

Using Finite Element Method for Stress-Strain Evaluation of Commonly Used Buried Pipelines in Fault

“…According to Saint-Venant's principle, the phenomenon of stress concentration generally appears near the point where the object is subjected to force. However, after a certain distance from the point of application of the force, the stress distribution tends to be uniform, that is, the local load of the object only affects a relatively small area near it, and the local effect of uneven stress can be ignored at a longer distance [11]. In this working condition, the large deformation of the pipe soil is mainly concentrated in a certain range on both sides of the fault, and the pipe section far away from the fault will move with the soil.…”