The nature of change in the residual stress-strain state of dovetail lock joints, taking into account nonlinear strains

Abstract

A general algorithm for calculating residual stresses based on the method of successive loadings is presented. The process of formation of residual stresses and strains in dovetail lock joints during its loading by centrifugal forces and subsequent unloading is simulated. The problem is solved in non-linear statement taking into account the elasticity, plasticity and creep strains. The fields of residual stresses and deformations in the grooves of the disk are obtained. The numerical solution of the problem was performed by the finite element method in the ANSYS software package. The influence of the opening angle on the nature of plastic strain zoning is analyzed. The opening angle was changed in the range from 45 to 70. It was established that with the development of creep strain, there is a change in the zone of nonlinear deformations and the nature of the distribution of residual stresses in the zone of the concentrator. The dependences of the value of maximum residual stresses on the opening angle , as well as their variation over time, are obtained.

Keywords

• stress concentration
• residual stresses
• compressor blade lock joints
• titanium alloy
• plasticity
• creep
• aging theory