Influence and Compensation of Temperature Effects for Damage Detection and Localization in Aerospace Composites
Guillermo Azuara1, Eduardo Barrera1
1Instrumentation and Applied Acoustics Research Group, Universidad Politécnica de Madrid, 28031 Madrid, Spain.
Sensors (Basel, Switzerland)
|July 30, 2020
Summary
This study presents a data-driven method to compensate for temperature effects on ultrasonic guided waves for structural health monitoring of Carbon Fiber Reinforced Polymers. The technique accurately locates impact damage even under varying environmental conditions.
Area of Science:
- Materials Science
- Mechanical Engineering
- Non-Destructive Testing
Background:
- Structural Health Monitoring (SHM) of Carbon Fiber Reinforced Polymers (CFRP) is crucial for safety and maintenance.
- Ultrasonic Guided Waves (UGW), specifically Lamb waves using Piezoelectric Transducers (PZT), are effective for Non-Destructive Inspection (NDI).
- Environmental and Operational Conditions (EOC), particularly temperature, significantly affect UGW characteristics like phase, amplitude, and time of flight (ToF).
Purpose of the Study:
- To develop and validate a data-driven methodology for evaluating and compensating temperature-induced effects on UGW for CFRP.
- To assess the effectiveness of the compensation method in the presence of impact damage.
- To accurately locate damage using advanced algorithms after temperature compensation.
Main Methods:
- A data-driven approach was employed to analyze UGW features from a pristine CFRP plate under varying temperatures.
- A compensation method was developed to mitigate temperature effects on wave propagation.
- The methodology was tested on a CFRP sample with induced impact damage.
- Damage localization was performed using the Reconstruction Algorithm for Probabilistic Inspection of Damage (RAPID) and its geometrical variant (RAPID-G).
Main Results:
- The developed method successfully evaluated and compensated for temperature variations impacting UGW.
- The compensation strategy improved the reliability of SHM data under different thermal conditions.
- Impact damage was accurately located using RAPID and RAPID-G after temperature compensation.
Conclusions:
- Temperature compensation is essential for reliable UGW-based SHM of CFRP.
- The data-driven methodology offers a robust solution for mitigating environmental effects.
- The study demonstrates the feasibility of accurate damage detection and localization in CFRP under varying EOC.
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