Finite-element modeling of the stress-strain state in disk-shaft type parts from dissimilar Ni-based alloys

Abstract

Abstract Finite element modeling of the stress-strain state of disk-shaft type parts of gas turbine engines during pressure welding has been made. Pressure welding was carried out by three schemes of deformation of a disk and/or a shaft. In Scheme 1, the shaft was inserted into the disk by setting the displacement of the upper die, in Scheme 2 simultaneous action of a die on the upper end surface of the disk and shaft was set, and in Scheme 3 the shaft was inserted into the disk by setting the displacement of the die, then the action of the die on the upper end surface of the disk was set. Computer simulation is performed using the DEFORM-2D software package. The deformable nickel base alloys EP975 and EK79 were taken as materials for a disk and a shaft, respectively. The results of computer simulation have shown that for increasing quality of the welded joint between the disk and the shaft it is preferable to use pressure welding which is carried out with a combination of sequence actions on the shaft and disk, since in this case an effective summarized compressive stresses and radial strain were achieved which leads to an increase of the joint quality.