In order to improve the efficiency of numeric integral of Chaboche constitutive model

backward Euler integration method

which also called implicit Euler integration method

of Chaboche model was brought forward.As an example

material IN738LC was used.Based on the backward Euler integration equation

FORTRAN programming format was used.Such a program was linked with FEM by user’s program interface HYPELA2 in MSC.Marc of a general FEM software.As a result

backward Euler method applied to Chaboche model could be used for structural analysis.A numerical result was given.Comparison was made between the numerical result and the experimental one.Comparison between the result of backward Euler method and the one of forward Euler method was made

too.It is found that the backward Euler method is accurate and has better convergency than the forward one.