Fracture Analysis of a First Stage Turbine Blade by FRANC3D

Abstract:

The premature failure of a blade occurred after a service life of 8127 EOH operation houre. This paper presents the fracture analysis of the first stage blade through fractographic and mechanical analysis. Crack growth mechanisms were evaluated based on the microscopic observations of the fracture surfaces by SEM. The analysis of the different region of the fracture surface shows that crack propagation is mainly related with fatigue mechanism. The crack propagation occurred in the pressure-suction side direction. The dynamic characteristics of the blade were evaluated by FEM in order to identify the cause of blade failure. The result depicts that the second mode of vibration might be excited and the vibratory stresses cause to HCF damage of the blade. Eventully fracture analysis of the blade under the presence of a fatigue crack was analyzed by FRACNC3D software.

• Periodical: Key Engineering Materials (Volumes 488-489)
• Pages: 17-20
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.488-489.17
• Online since: September 2011
• Authors: Saeed Asadikouhanjani, Reza Ghorbani
• Keywords: Fatigue, Fracture, Gas Turbine Blade, Stress Intensity Factor (SIF), Tip Rubbing

References

[1] Dj.M. Maric, P.F. Meier and S.K. Estreicher: ENG FAIL ANAL Vol. 9 (2002), p.201.

[2] R. Ghorbani, S. Asadikouhanjani, K. Kusterer and A. H Ayed: Fracture Analysis of a First Stage Turbine Blade, Proceedings of ASME Turbo Expo 2010: Power for Land, Sea and Air.

DOI: 10.1115/gt2010-22802

[3] B. N. J. Persson, E. Tosatti: Physics of sliding friction, chapter I, Kluwer Academic Publishers (1996).

[4] W. Hoffelner: METALL TRANS A Vol. 13A (1982), p.1245.

[5] Information on http: /www. cfg. cornell. edu/software/software. htm.