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Holographic Analysis of Turbine Blades FREE

[+] Author Affiliations
J. P. Waters, H. G. Aas

United Aircraft Research Laboratories, East Hartford, CT

Paper No. 71-GT-84, pp. V001T01A084; 11 pages
doi:10.1115/71-GT-84
From:
  • ASME 1971 International Gas Turbine Conference and Products Show
  • ASME 1971 International Gas Turbine Conference and Products Show
  • Houston, Texas, USA, March 28–April 1, 1971
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7982-5
  • Copyright © 1971 by ASME

abstract

Holographic techniques have been employed to study various turbine blade characteristics. The studies were performed using both helium-neon continuous wave (CW) and ruby pulse lasers to generate static double-exposure (CW), dynamic time-average (CW), or dynamic double-exposure (pulsed) interferometric holograms. In general, the interferometric holograms reconstruct the turbine blades in two different states of stress and produce a set of bright and dark interference fringes (on the reconstructed image) which represent contours of equal surface displacement. The turbine blade was stressed in several ways. The displacement contours obtained were used to define and evaluate characteristics of the blade. Described in detail are results of holographic surface strain measurements made on both solid and hollow turbine blades. Comparisons are also made with conventional strain gage measurements. A review of the resonant modes present on turbine blades and an analysis of the resulting interferometric fringe patterns are made. Vibrational excitation, of up to 45,000 Hz, is examined. Also included are preliminary results of studies for inspecting hollow turbine blades using internal pressurization as a means for detecting internal damage or flaws; and for obtaining a qualitative measure of turbine wall thickness using acoustic vibration. Finally, results of an experimental investigation concerned with the effects of temperature on turbine blade holography are described and principal results reviewed.

Copyright © 1971 by ASME
Topics: Turbine blades
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