THERMAL SCIENCE

International Scientific Journal

REMAINING LIFE ASSESSMENT OF POWER PLANT COMPONENTS EXPOSED TO HIGH TEMPERATURE STATIONARY CREEP

ABSTRACT
Remaining life of high temperature cracked components has been analysed, using time dependent fracture mechanics parameters. As the most efficient parameter for stationary creep problems and simple component geometry, the C* integral has been used, taking advantage of its complete analogy with the J integral, well established fracture mechanics parameter for elastic-plastic problems. In other cases, the importance of detailed thermal analysis, including numerical evaluation of temperature fields based on accurately determined boundary and initial condition, is emphasized. Three-step assessment procedure has been applied in order to evaluate the influence of material damage and initial crack length on steamline remaining life. The C* integral, as a crucial parameter in this procedure, has been evaluated using EPRI procedure, developed for elastic-plastic problems, but applied here to stationary creep problem. The results indicate significant influence of material damage and initial crack length.
PAPER SUBMITTED: 1999-04-23
PAPER REVISED: 1999-10-04
PAPER ACCEPTED: 1999-11-03
PUBLISHED ONLINE: 2020-09-27
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 1998, VOLUME 2, ISSUE Issue 2, PAGES [75 - 85]
REFERENCES
  1. Sedmak, A. et al. Critical Crack Form and Size Assessment for High and Intermediate Pressure Turbine Rotors in Thermal Power Plants in EPS' (in Serbian), Report 30/90, EPS, 1994
  2. Rice, J. R., Mathematical Analysis in the Mechanics of Fracture, Fracture: An Advance Treatise, Vol. IT, Academic Press, New York, 1968, p. 191
  3. Landes, J. D., Begley, J. A., A Fracture Mechanics Approach to Creep Crack Growth, ASTM STP 590, Philadelphia, 1976, pp. 128-148
  4. Shih, C. F., German, M. D., Kumar, V., An Engineering Approach for Examining Crack Growth and Stability of Flawed Structure, EPRI Report NP-1931, EPRI, Palo Alto, 1981
  5. Grujić, B., Identification of Quality and Reliability of Material Exposed to Creep in Thermal Power Plants (in Serbian), D. Sc. thesis (submitted), Faculty of Technology & Metallurgy, Belgrade, 1999
  6. *** GOST 10500-63
  7. Berković, M., Two- and Three-Dimensional Stress State Problems in Pressure Vessels and Pipelines (in Serbian), Proceedings, The Second Fracture Mechanics Summer School Institute GOSA and Faculty of Technology & Metallurgy, Belgrade, 1983, pp. 35-50
  8. Viswanathan, R., Remaining Life Techniques for Plant Life Extension, Materials Science and Engineering, A103, 1988, pp. 131-139
  9. Nikolić, M., Engineering Estimation of Elastic-Plastic Fracture Mechanics Parameters (in Serbian), M. Sc. thesis, Faculty of Mechanical Engineering, Belgrade, 1995

© 2022 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, 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