Journal
SENSORS
Volume 18, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/s18082527
Keywords
fatigue crack detection; ultrasonic nonlinearity; self-sensing; linear and nonlinear parameters; temperature variation; structural health monitoring; nondestructive evaluation
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2015R1C1A1A01052625]
- National Research Foundation of Korea [2015R1C1A1A01052625] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ask authors/readers for more resources
This paper proposes a self-sensing nonlinear ultrasonic technique for fatigue crack detection under temperature variations. Fatigue cracks are identified from linear (alpha) and nonlinear (beta) ultrasonic parameters recorded by a self-sensing piezoelectric transducer (PZT). The self-sensing PZT scheme minimizes the data acquisition system's inherent nonlinearity, which often prevents the identification of fatigue cracks. Also, temperature-dependent false alarms are prevented based on the different behaviors of alpha and beta The proposed technique was numerically pre-validated with finite element method simulations to confirm the trends of alpha and beta with changing temperature, and then was experimentally validated using an aluminum plate with an artificially induced fatigue crack. These validation tests reveal that fatigue cracks can be detected successfully in realistic conditions of unpredictable temperature and that positive false alarms of 0.12% occur.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available