THERMAL SCIENCE

International Scientific Journal

FRACTURE MECHANICS ANALYSIS OF DAMAGED TURBINE ROTOR DISCS USING FINITE ELEMENT METHOD

ABSTRACT
This paper presents evaluation fracture mechanics parameters in low pressure turbine components. Critical locations such as keyway and dovetail area are experiencing stress concentration leading to crack initiation. Stress intensity factors were evaluated using the J-Integral approach available within ANSYS software code. The finite element method allowed the prediction of the point of crack initiation and the crack propagation using the orientations of the maximum principal stresses. Special attention in this investigation is focused to develop analytic expressions for stress intensity factors at critical location of low pres-sure steam turbine disc. [Projekat Ministarstva nauke Republike Srbije, br. I-174001 i br. TR-35045]
KEYWORDS
PAPER SUBMITTED: 2012-11-07
PAPER REVISED: 2013-03-05
PAPER ACCEPTED: 2013-09-30
PUBLISHED ONLINE: 2014-07-06
DOI REFERENCE: https://doi.org/10.2298/TSCI121107176V
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2014, VOLUME 18, ISSUE Supplement 1, PAGES [S107 - S112]
REFERENCES
  1. Lio, C. and Macdonald, D.D., Prediction of Failures of Low-Pressure Steam Turbine Discs, J. Pressure Vessel Tehnol,Vol.119, Issue 4, pp. 393-400, 1997.
  2. Jovi.i. G., Grabulov V., Maksimovi. S., .ivkovi. M., Jovi.i. N., Bo.kovi. Z., and Maksimovi. K. Residual Life Estimation of a Thermal Power Plant Component . The High-Pressure Turbine Housing Case, Thermal Science, Vol. 13 (2009), No. 4, pp. 99-106.
  3. G. Pluvinage, Fracture Criteria: Global or Local?, Structural Integrity and Life, Vol. 11, No. 3, 2011, p. 147-156
  4. Yu. G. Matvienko, Development of Models and Criteria of Notch Fracture Mechanics, Structural Integrity and Life, Vol. 11, No. 1, 2011 p. 3 - 7
  5. T. Maneski, V. Milo.evi.-Miti., Numerical and experimental diagnostics of structural strength, Structural Integrity and Life, Vol. 10, No. 1, 2010 p.3-10.
  6. P. Agatonovi., Different Strategies for Evaluation Remaining Strength and Life, Structural Integrity and Life, Vol. 1, No 2, p.75-89.
  7. A. Sedmak, H. A. Anyiam Structural Integrity Assessment Using Fracture Mechanics, Structural Integrity and Life, Vol. 1, No 2, p.67-73
  8. S. Sedmak, Z. Radakovi., Lj. Milovi., I. Svetel, Significance and Applicability of Structural Integrity Assessment, Structural Integrity and Life,Vol. 12, No. 1, 2012, p. 3-30
  9. Maksimovic S., Posavljak S., Maksimovic K., Nikolic V., and Djurkovic V., Total Fatigue Life Estimation of Notched Structural Components Using Low-Cycle Fatigue Properties, STRAIN An International Journal for Experimental Mechanics, (2011) 47 (Suppl. 2), pp. 341-349.
  10. Maksimovi. S., Vasovi. I., Maksimovi. M., .uri. M., Residual Life Estimation of Damaged Structural Components Using Low-Cycle Fatigue Properties, The „Shird International Congress of Serbian Society of Mechanics, Vlasina lake, 2011.
  11. R. Wanhill, Some notable aircraft service failures investigated by the National Aerospace Laboratory (NLR), Structural Integrity and Life, Vol. 9, No. 2 p . 71-87
  12. S.A. Barter, L. Molent, P. White, B. Dixon, Recent Australian full-scale F/A-18 fatigue tests, Structural Integrity and Life, Vol. 9, No. 2 p. 89-112
  13. S. Posavljak Damages computation of aircraft engine disks, Structural Integrity and Life, Vol. 9, No. 2 p. 113-124
  14. Barsoum R.S., On the use of isoparametric finite elements in linear fracture mechanics. International Journal for Numerical Methods in Engineering 1976; 10: pp 551-564.
  15. Barsoum RS. Triangular quarter-point elements as elastic and perfectly-plastic crack tip elements. International Journal for Numerical Methods in Engineering 1977; 11: pp 85-98.
  16. M. Berkovi., Determination of Stress Intensity Factors Using Finite Element Method, Structural Integrity and Life,Vol. 4, No.2 p. 57-62.
  17. M. Berkovi., Numerical Methods in Fracture Mechanics, Structural Integrity and Life, Vol. 4, No. 2p. 63-66.
  18. Bla.i. M., Maksimovi. K., Assoul Y., Determination of Stress Intensity Factors of of Structural Elements by Surface Cracks, Third Serbian Congress Theoretical and Applied Mechanics, Vlasina Lake, Serbia, 5-8 July 2011, pp. 374-383.
  19. Rice, J.R., A Path Independent Integral and Approximate Analysis of Strain Concentration by Notches and Cracks, J. Applied Mechanics, Trans. ASME 35, 1968, pp 379-386.
  20. Wilson, W.K. and Yu, I.W., The use of the J-integral in Thermal Stress Crack Problems, Int. Journal of Fracture, Vol. 15, No. 4, August 1979, pp 317-387.
  21. Maksimovic, S., Finite Elements in Thermoelastic and Elastoplastic Fracture Mechanics, Proc. 3rd International Conference FENOMECH, Swansea, UK, 1984, pp 495-504.
  22. Maksimovic, S., An investigation of the Effect of Thermal Gradients on Fracture, 6th Int. Conference on Fracture, New Delhi, India,Vol. 2, 1984, Pergamon Press Oxford.
  23. Boljanovic S., Maksimovic S., Analysis of the crack growth propagation process under mixed-mode loading, Engineering Fracture Mechanics, Volume 78, Issue 8, May 2011, pages 1565-1576.
  24. Maksimovi. K., Nikoli.-Stanojevi. V., Maksimovi. S., Modeling of the surface cracks and fatigue life estimation, ECF 16, Alexandroupolis, Greece, 2006.
  25. Stamenkovic, D., Determination of Fracture Mechanics Parameters using FEM and J-integral Approach, Finite element simulation of the high risk constructions, Special Session, within 2nd WSEAS International Conference on Applied and Theoretical Mechanics (MECHANICS'06), Eds Mijuca, D and Maksimovic, S., Venice, 2006
  26. Stamenkovic, D, Evaluation Fracture Mechanics Parameters of Thermally Loaded structures, Scientific structures, Scientific Technical Review, No. 2, 2008.

© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence