Finite Element Simulation of the Creep Behavior of 2.25Cr-1Mo-0.25V Steel Based on Continuum Damage Mechanics

Abstract:

The creep behavior of 2.25Cr-1Mo-0.25V ferritic steel was investigated using a set of physically-based creep damage constitutive equations. The material constants were determined according to the creep experimental data, using an efficient genetic algorithm. The user-defined subroutine for creep damage evolution was developed based on the commercial finite element software ANSYS and its user programmable features (UPFs), and the numerical simulation of the stress distribution and the damage evolution of the semi V-type notched specimen during creep were studied. The results showed that the genetic algorithm is a very efficient optimization approach for the parameter identification of the creep damage constitutive equations, and finite element simulation based on continuum damage mechanics can be used to analyze and predict the creep damage evolution under multi-axial stress states.

• Periodical: Applied Mechanics and Materials (Volume 750)
• Pages: 266-271
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.750.266
• Online since: April 2015
• Authors: Yu Zhou*, Xue Dong Chen, Zhi Chao Fan, Yi Chun Han
• Keywords: Continuum Damage Mechanics, Creep Damage, Finite Element Simulation, Genetic Algorithm (GA)

References

[1] Z.D. Liu, J. Chen, H.Q. Bu, X.D. Chen, Development of 2. 25Cr-1Mo-0. 25V steel hydrogenater and some problems on the fabrication, Pres. Ves. Tech., 28 (2011) 33-40.

[2] R. Mustata, D.R. Hayhurst, Creep constitutive equations for a 0. 5Cr 0. 5 Mo 0. 25V ferritic steel in the temperature range 565°C–675°C, Int. J. Pres. Ves. Pip., 82 (2005) 363-372.

DOI: 10.1016/j.ijpvp.2004.11.002

[3] D.R. Hayhurst, I.W. Goodall, R.J. Hayhurst, Lifetime predictions for high-temperature low-alloy ferritic steel weldments, J. Strain Analysis, 40 (2005) 675-701.

DOI: 10.1243/030932405x30885

[4] R.J. Hayhurst, R. Mustata, D. R. Hayhurst, Creep constitutive equations for parent, Type IV, R-HAZ, CG-HAZ and weld material in the range 565–640°C for Cr–Mo–V weldments, Int. J. Pres. Ves. Pip., 82 (2005) 137-144.

DOI: 10.1016/j.ijpvp.2004.07.014

[5] Q. Xu, Creep damage constitutive equations for multi-axial states of stress for 0. 5Cr0. 5Mo0. 25V ferritic steel at 590°C, Theo. App. Frac. Mech., 36 (2001) 99-107.

DOI: 10.1016/s0167-8442(01)00060-x

[6] T.H. Hyde, W. Sun, J.A. Williams, Prediction of creep failure life of internally pressurised thick walled CrMoV pipes, Int. J. Pres. Ves. Pip., 76 (1999) 925-933.

DOI: 10.1016/s0308-0161(99)00078-2

[7] S.D. Tu. High Temperature Structural Integrity, Science Press, Beijing, (2002).