Numerical Simulation Of Creep And Fatigue Damage For Interface Moving Graded Materials

Computers are widely used in the field of materials science. The numerical simulation and calculation of microstructure distribution, stress field and anticipative life for the interface moving graded materials used in industrial engineering are significant to improve the material's working life and the security of production. It can offer the scientific evidence for the detection of materials' damage.Based on the analysis of the typical service condition of the representative of interface moving graded materials - the ethylene cracking tube, a FEM calculation model of damage of the tube is established under the interaction of carburization and creep. The carbon concentration, stress distribution and creep damage fraction of HK40 and HP steel are calculated at 1173K. This model can be used to analyze the failure and to predict the damage and the residual life of the tube. It is helpful for the tube exchanging in time.Considering the well use of Fortran in scientific calculation, VC++ in visual programming and OpenGL in graphic showing, the pilot study of mixed-language programming is practiced in the aftertreatment program. It can vividly display the carbon concentration, stress distribution and the creep damage fraction of the tube during the service process at different time.The model established for the tube can be extended to calculate the interface moving graded materials that have similar character. It provides a method for the simulation of graded materials worked in complex condition. The realization of mixed-language programming lays a foundation for the perfection of the program. On the other hand, we can again utilize a lot of mature Fortran program that handed down, and avoid programming again and wasting resources.