Papers by Wei Liang Choong
High-power acoustic excitation of components during a thermosonic (or Sonic IR) inspection may de... more High-power acoustic excitation of components during a thermosonic (or Sonic IR) inspection may degrade the structural integrity of the component by propagating existing cracks. Process Compensated Resonance Testing (PCRT) technology can be used to detect changes in material properties by comparing a components resonant spectra to a reference spectra at regular intervals after systematic exposure to high-power excitation associated with thermosonic inspection. The objective of this work is to determine whether a typical thermosonic inspection degrades the structural integrity of a turbine blade. In this work, the resonant spectra of six cracked and six uncracked turbine blades are captured before and after a series of thermosonic inspections. Next, these spectra are analyzed using proprietary software for changes in resonant behavior. Results from this work indicate no change in blade resonant behavior for a typical thermosonic inspection.
The non-destructive Process Compensated Resonance Testing (PCRT) methodology has been used to ins... more The non-destructive Process Compensated Resonance Testing (PCRT) methodology has been used to inspect Ti6Al4V (Ti-64) specimens fabricated by metal injection moulding (MIM). The purpose of this study has been to determine whether PCRT can be used as a non-destructive testing method to evaluate the performance of MIM samples and to use the resonant data to test whether PCRT can be closely correlated to the yield strength, which is represented in this study by the offset 0.2% proof stress. In order to do this, resonant frequencies and correlations between the results of the PCRT method and the destructive mechanical test were studied to evaluate performance of the samples. A good performance of the PCRT system was achieved and the results were used to predict the 0.2% proof stress of MIM Ti-64 samples. Correlation analysis results showed that the total variation in 0.2% proof stress that can be attributed to resonant frequencies was above 95% for MIM tensile specimens.
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Papers by Wei Liang Choong