Verification of Accelerated Methods for Determining the S-N Curve


Article Preview

The paper presents accelerated methods for determining the fatigue curve in high cycle fatigue. The estimated fatigue characteristics using these algorithms always show an error, however the applicable literature does not seem to specify how accurate the methods are, which calls for their further examination. To verify the approximation methods, material C45+C was tested to provide reference characteristics. For the experimental results to be received, the test equipment developed applying own design was used. The analysis of the data has confirmed a good operation of the testing machine. To verify the accelerated methods, there was applied the statistics method to compare the coefficients of the regression curve from the experimental data and the coefficients of the analytical regression method. Using that comparison method, it can be assumed that only the estimated curve applying the algorithm by Strzelecki P. & Sempruch J. demonstrates the factors equal to the empirical line.



Edited by:

Amanda Wu




S. Przemysław, "Verification of Accelerated Methods for Determining the S-N Curve", Applied Mechanics and Materials, Vol. 232, pp. 8-13, 2012

Online since:

November 2012




[1] ISO 1143 Metallic materials – Rotating bar bending fatigue testing. (2010).

[2] GUTTIERREZ-SOLANA F., et al., FITNET Basic Training Package, Universidad de Cantabria, http: /www. eurofitnet. org/ index. html. (2006).

[3] M. Kocak. FITNET Final Technical Report, FITNET European Fitness for service network, http: /www. eurofitnet. org/index. html. (2006).

[4] W. Krysicki, et al., Probability theory and mathematical statistics in problem, PWN, Warszawa. (2000).

[5] Lee Yung-Li, Pan Jwo, R. B. Hathaway, M. E. Barkey. Fatigue testing and analysis, University of Alabama, Elsevier. (2005).


[6] A. Neimitz, I. Dzioba, M. Graba, J. Okrajni. Evaluation of strength, life and safety of structural components contain defects. Politechnika Świętokrzyska, Kielce. (2008).

[7] Ł. Pejkowski, D. Skibicki. Analysis of accelerated methods for determination of fatigue curves. Journal of Polish Cimac Selected problems of designing and operating technical systems Vol. 6 No 3; (2011). pp.199-214.

[8] PN-H-04325: 1976, Test of metal fatigue - Basic terms and general guidelines for preparing of samples and carry out tests.

[9] J. Schijve. Fatigue of structures and materials, second edition, Delf Springer, (2009).

[10] J. Sempruch, P. Strzelecki. Error of fatigue life determination according to the FITNET method. 17th International Conference Engineering Mechanics, (2011). pp.531-534.

[11] S.M. Sonsino. Fatigue testing under variable amplitude loading. International Journal of Fatigue Vol. 29 (2007), p.1080–1089.


[12] I. Stephens Ralph, et al., Metal fatigue in engineering, edition 2, New York Wiley, (2001).

[13] P. Strzelecki, J. Sempruch. Modification of selected methods of rapid determination of fatigue characteristics in the range of limited fatigue life, Journal of Polish Cimac Selected problems of designing and operating technical systems Vol. 6 No 3; (2011).