Presenting a model for prediction of crack growth under simultaneous creep and corrosion

The process of crack growth in parts subjected to hot fluids is studied. The high temperature of the fluid activates the creep and corrosion processes. The hereditary creep theory is used for calculating the stress field. A creep function is introduced to determine the forces acting on the crack at the crack concealment and crack growth stages. The resisting force is calculated by using the Rabotnov method of accumulated small fractures in the crack region. The effect of the corrosive environment is considered in the calculations by using the penetration function. The resultant equations are solved by using the MATLAB software. The effects of the initial crack length and the applied stress on the crack growth curve are investigated.