Fatigue Failure Analysis of Twisted Blade

International Journal of Mechanical Engineering

© 2014 by SSRG - IJME Journal

Volume 1 Issue 3

Year of Publication : 2014

Authors : Madan Kumara M C, Nandish. R. V, Madhu E,S Ramachandra

10.14445/23488360/IJME-V1I3P104

How to Cite?

Madan Kumara M C, Nandish. R. V, Madhu E,S Ramachandra, "Fatigue Failure Analysis of Twisted Blade," SSRG International Journal of Mechanical Engineering, vol. 1,  no. 3, pp. 11-15, 2014. Crossref, https://doi.org/10.14445/23488360/IJME-V1I3P104

Abstract:

Usually turbine blades fail due to the various forces acting on the blade during operation in which centrifugal forces is important. The effect of centrifugal forces on the turbine blade is very important in the evaluation of life of the blade. In turbine blades due to the large centrifugal forces the blades susceptible to high cycle fatigue frequently. Sometimes the failure of the turbine blade is eliminated by the design. This can be achieved by twisting the turbine blades and the blade’s cross section varies throughout the length of the blade. The root position of the blade is the region of interest because the stress concentration is high at the root of the blade. Here the failure analysis is done by creating the notches on the leading edge of the blade. In this paper the effect of the notches on the twisted blade is presented. Here the notches are created at the leading edge at different distances from the root of the blade. At the same time the size of the notches are also varied. Fatigue analysis is done for the notched twisted rotating blade, alternating stress, stress intensity, strain energy and life of the blade is found.

Keywords:

High cycle fatigue, twisted blade, FEA, Centrifugal force, Angle of attack.

References:

[1]    G.Narendranath,S.Suresh, “Thermal Analysis of a Gas Turbine Rotor Blade by Using Ansys”,International Journal of Engineering Research and Applications,ISSN: 2248-9622,Vol. 2, Issue 5, September- October 2012, pp.2021-2027.
[2]    Patil.A.A, Shirsat U.M, “Study of Failure Analysis of Gas Turbine Blade”, IOSR Journal of Engineering,2878-8719 PP 37-43.
[3]    S. Bhat and R. Patibandla (2011). Metal fatigue and basic theoretical models: a review, alloy steel - properties and useDr. Eduardo Valencia Morales (Ed.), ISBN: 978-953-307-484-9, InTech, DOI: 10.5772/28911.
[4]    Segersäll, Mikael, “Nickel-Based Single-Crystal Superalloys: the crystal orientation influence on high temperature properties”, Licentiate thesis, Linköping University Electronic Press, Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971; 1568, 2013.
[5]    Madan Kumara M C1, Nandish. R. V2, Madhu E3, “Fatigue Failure Analysis of Rotating Blade of Uniform Varying Cross Section with Damage at the Leading Edge”,International Journal of Innovative Research in Science, Engineering and Technology.ISSN: 2319-8753,Vol. 3, Issue 4, April 2014.
[6]    Dr. Nabeel K. AL-sahib, “Effect of the Mechanical and Thermal Stresses of Rotating Blades” Al-Khwarizmi Engineering Journal, Vol.3, No2,pp32 -48 (2007).
[7]    Mohammad Amin Rashidifar, “Effects of Blades bending on the Flatter speed of Gas Turbine with Timoshenko theory”, Advances in Mechanical Engineering and its Applications (AMEA) Vol. 2, No. 1, 2012, ISSN 2167-6380.