Monitoring crack propagation in turbine blades caused by thermosonic inspection

G. Bolu, A. Gachagan, G. Pierce, G. Harvey, L. Choong

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

1 Citation (Scopus)

Abstract

High power acoustic excitation of components during a thermosonic (or Sonic IR) inspection may further propagate existing cracks. Monitoring such changes through destructive or non-destructive means is no trivial task. Process Compensated Resonance Testing (PCRT) technology offers the capability to
monitor the growth of fatigue-induced cracks (and other progressive defects) through statistical analysis of changes in a components resonant spectra over time. This technique can be used to detect changes in material properties
by comparing a components spectra to itself at regular intervals after systematic exposure to high power excitation associated with thermosonic inspection. In this work, the resonant spectra of 6 cracked and 6 uncracked turbine blades are captured prior to batch of inspections. Next, these spectra are analysed using proprietary software for changes in resonant behaviour. Results from this work
indicate that a typical thermosonic inspection of a turbine blade for crack detection does not cause crack propagation or degrade a blades structural integrity.
Original languageEnglish
Title of host publicationREVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION
Pages1654
Volume29
Publication statusPublished - Feb 2010
EventReview of Progress in Quantitative NDE - Kingston, Rhode Island, United States
Duration: 26 Jul 200931 Jul 2009

Conference

ConferenceReview of Progress in Quantitative NDE
CountryUnited States
CityKingston, Rhode Island
Period26/07/0931/07/09

Keywords

  • crack propagation
  • turbine blades
  • thermosonic inspection
  • high power acoustic excitation
  • process compensated resonance testing
  • fatigue-induced cracks
  • resonant behaviour

Cite this

Bolu, G., Gachagan, A., Pierce, G., Harvey, G., & Choong, L. (2010). Monitoring crack propagation in turbine blades caused by thermosonic inspection. In REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION (Vol. 29, pp. 1654)