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Damage source localisation in complex geometries using acoustic emission and acousto-ultrasonic techniques: an
Claudia Barile1, Claudia Cianci1, Vimalathithan Paramsamy Kannan1
1Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, Bari, Italy.
Scientific Reports
|September 14, 2024
Summary
This study introduces a new method using acousto-ultrasonics (AU) and acoustic emission (AE) to pinpoint damage in clear dental aligners. The approach successfully identified significant damage in specific areas of the aligners, improving non-destructive evaluation.
Area of Science:
- Materials Science
- Biomedical Engineering
- Non-Destructive Evaluation
Background:
- Clear dental aligners are widely used but their mechanical behavior and potential damage are not well understood.
- Accurate damage localization in complex geometries is challenging for traditional non-destructive evaluation (NDE) methods like acoustic emission (AE) and acousto-ultrasonics (AU).
Purpose of the Study:
- To develop and validate a novel acousto-ultrasonics (AU)-guided acoustic emission (AE) frequency interpretation approach for damage localization in complex geometries.
- To investigate the mechanical integrity and identify damage origins in clear dental aligners under cyclic loading.
Main Methods:
- Utilized acousto-ultrasonics (AU) to study the frequency characteristics of stress waves generated at different locations within clear dental aligners.
- Analyzed acoustic emission (AE) signals generated during cyclic compression loading of aligners, examining both frequency and time-domain characteristics (Time of Arrival - ToA).
- Employed the Akaike Information Criterion (AIC) for accurate estimation of Time of Arrival (ToA) to aid in damage source identification.
Main Results:
- Successfully correlated AU-derived frequency characteristics with AE signals to interpret damage.
- Identified specific regions of significant damage within the clear dental aligners, namely the left maxillary premolar and right maxillary third molar.
- Demonstrated the efficacy of the proposed AU-guided AE approach in localizing damage in complex dental aligner geometries.
Conclusions:
- The novel AU-guided AE frequency interpretation method effectively overcomes limitations in damage localization for complex geometries.
- This technique provides a valuable tool for identifying localized damage in clear dental aligners during their usage period.
- The findings highlight the importance of mechanical evaluation for clear aligners and offer a pathway for improved product monitoring and quality control.
