Based on the Bodner-Partom visco-elastic-plastic constitutive theory

after developing a self-adaptive time integration method for the constitutive equation

a user defined subroutine was developed and implemented into the general purpose non-linear finite element software ANSYS.The software takes material deformation

cyclic and variable loading condition into account.Compared to the published results

it shows that the calculated results are satisfactory

and the accuracy and efficiency are acceptable.Further

stress analysis of a turbine disc based on B-P constitutive equations was carried out. The calculated results show that the coded subroutine can be applied to the nonlinear structure analysis of aero-engine hot sections.