Research on Application of Supported Vector Machine to Creep-Fatigue Lifetime Prediction of P91 Steel

Abstract:

Creep-fatigue tests were carried out to study creep-fatigue property of P91 steel in many references. There are two kinds of loading control methods. One is controlled by stress, and the other is controlled by strain. In this study the creep-fatigue test data loading controlled by stress are summarized. Based on these data Supported Vector Machine(SVM) method is used to build up the models to predict the creep-fatigue lifetime of P91 steel. The results show SVM method can be used to predict the creep-fatigue life of P91 steel, and the value of insensitive factor is very important. When the value of insensitive factor is small and the training error of the model is small too, but the prediction ability decreases. On the contrary when insensitive factor is increased, the training error will become large, and the prediction ability will increase. So during the training, mean square error should not be regarded as the unique goal function.

• Periodical: Advanced Materials Research (Volumes 616-618)
• Pages: 1787-1796
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.616-618.1787
• Online since: December 2012
• Authors: Dong Mei Ji
• Keywords: Creep Fatigue, Life Prediction, P91 Steel, Support Vector Machine (SVM)

References

[1] Hyeong-Yeon Lee , Se-Hwan Lee, Jong-Bum Kim etc. Creep–fatigue damage for a structure with dissimilar metal welds of modified 9Cr–1Mo steel and 316L stainless steel[J]. International Journal of Fatigue ,29 (2007) 1868–1879.

DOI: 10.1016/j.ijfatigue.2007.02.009

[2] N. Le Mat Hamata, I. A. Shibli. Creep crack growth of seam-welded P22 and P91 pipes with artificial defects. Part I: Experimental study and post-test metallography[J]. International Journal of Pressure Vessels and Piping, 78 (2001) 819-826.

DOI: 10.1016/s0308-0161(01)00096-5

[3] N. Le Mat Hamata, I. A. Shibli. Creep crack growth of seam-welded P22 and P91 pipes with artificial defects. Part II: data Analysis[J]. International Journal of Pressure Vessels and Piping, 78 (2001) 827-835.

DOI: 10.1016/s0308-0161(01)00097-7

[4] Hao Yu-long. Research on the creep characteristic and creep-fatigue interaction for P91 steel[D]. Southwest Jiaotong University, 2005,4.

[5] Wei Feng. Research on damage model of creep-fatigue interaction and life accessment for P91 steel[D]. Southwest Jiaotong University, 2006.

[6] J. Granacher A. Klenk, M.Tramer, G.Schellenberg etc. creep fatigue crack behavior of two power plant steels[J]. International Journal of pressure vessel and piping, 78 (2009) 909-920.

DOI: 10.1016/s0308-0161(01)00106-5

[7] B. Fournier, M. Sauzay, C. Ca¨es etc. Creep–fatigue- oxidation interactions in a 9Cr–1Mo martensitic steel .Part I: Effect of tensile holding period on fatigue lifetime[J]. International Journal of Fatigue, 30 (2008) 649–662.

DOI: 10.1016/j.ijfatigue.2007.05.007

[8] B. Fournier, M. Sauzay, C. Ca¨es etc. Creep–fatigue -oxidation interactions in a 9Cr–1Mo martensitic steel . Part II: Study of the influence of creep and stress relaxation holding times on cyclic behaviour[J].International Journal of Fatigue,30 (2008) 663–676.

DOI: 10.1016/j.ijfatigue.2007.05.008

[9] B. Fournier, M. Sauzay, C. Ca¨es etc. Creep–fatigue -oxidation interactions in a 9Cr–1Mo martensitic steel . Part III: Lifetime prediction[J]. International Journal of Fatigue, 30 (2008) 1797–1812.

DOI: 10.1016/j.ijfatigue.2008.02.006

[10] B. Fournier, M. Sauzay, C. Ca¨es etc. High temperature creep–fatigue–oxidation interactions in 9–12%Cr martensitic steels[J]. Journal of Nuclear Materials. (2009) 418–421.

DOI: 10.1016/j.jnucmat.2008.12.139

[11] B. Fournier, M. Sauzay, C. Ca¨es etc. Creep-Fatigue Interactions in a 9 Pct Cr-1 Pct Mo Martensitic Steel: Part I. Mechanical Test Results[J]. Metallurgical and materials transactions A, 40 (2009) 321-329.

DOI: 10.1007/s11661-008-9686-z

[12] Yukio Takahashi. Study on creep-fatigue evaluation procedures for high-chromium steels—Part I: Test results and life prediction based on measured stress relaxation[J]. International Journal of Pressure Vessels and Piping, 85 (2008) 406–422.

DOI: 10.1016/j.ijpvp.2007.11.008

[13] Yukio Takahashi. Study on creep-fatigue evaluation procedures for high chromium steels—Part II: Sensitivity to calculated deformation[J].International Journal of Pressure Vessels and Piping, 85 (2008) 423–440.

DOI: 10.1016/j.ijpvp.2007.11.006