Three Dimensional Numerical Simulation of Various Thermo-mechanical Processes by FEM (Report III) : Deformation Analysis of Compressors under Assembly by Plug Welding(Mechanics, Strength & Structural Design)

概要

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Residual deformations and stresses after plug welding of a thin-wall cylinder with an inner bearing are analyzed. The numerical simulations are performed using the Thermal-Elastic-Plastic Finite Element Method. In these simulations 3-D solid element in which local coordinate system is introduced. In this element the reduced integration method is employed to prevent the numerical locking phenomena during bending deformation of the cylinder. The eccentricity of the bearing and the radial deformations at the end of the cylinder are analyzed for various cases with different conditions of plug welding. The computed results are compared with the measured values and good agreement is obtained. These simulations provide the possibility to predict the effects of various parameters on welding deformations and to control it to maintain high accuracy of the compressors. The residual stresses during plug welding are also calculated. The results show that the maximum principle stresses appear in the heat affected zone around the plug welds and reach high values.
大阪大学の論文