TY - JOUR
T1 - Lamb Wave-Based Structural Health Monitoring for Aluminum Bolted Joints with Multiple-Site Fatigue Damage
AU - Chen, Chung De
AU - Hsieh, Chia Hung
AU - Liu, Chi Yuan
AU - Huang, Yao Hung
AU - Wang, Po Hao
AU - Chien, Rong Der
N1 - Funding Information:
The authors appreciate the Aerospace Industrial Development Corporation (AIDC) for the financial support and for providing instruments used in the experiments. The authors are grateful to Chuen-Yu Chen and Gow-Ming Lin for their support of the research project management. The authors also are grateful to Ju-Ming Chen for his regular participation in technical meetings during this research.
Publisher Copyright:
© 2022 American Society of Civil Engineers.
PY - 2022/11/1
Y1 - 2022/11/1
N2 - In this paper, the Lamb wave based structural health monitoring for aluminum bolted joints with multiple-site fatigue damages was investigated experimentally. In the experiments, the Lamb waves were generated and received by piezoelectric transducers. Three specimens were prepared for fatigue testing and monitored by the Lamb wave signals. Due to the complex geometry of the specimen, multiple fatigue cracks were observed at different bolt holes during the fatigue testing. The signals before and after the initiation of the fatigue cracks were compared to calculate the damage index (DI). In general cases, DI can serve an indicator to map the fatigue crack size. In the experiments, it was found that the phase shifts between the baseline signal before fatigue crack initiates, Sb(t), and the signal with fatigue cracks, S(t), can result in an overestimated DI. To solve this problem, the envelope damage index (EDI) was introduced to monitor the fatigue cracks. The envelope curves of Sb and S are considered in the calculation of EDI. In the experiments, three specimens were prepared for fatigue testing. Crack-size observations of the specimens indicated that the EDI is a better parameter than DI for monitoring the fatigue crack size and location.
AB - In this paper, the Lamb wave based structural health monitoring for aluminum bolted joints with multiple-site fatigue damages was investigated experimentally. In the experiments, the Lamb waves were generated and received by piezoelectric transducers. Three specimens were prepared for fatigue testing and monitored by the Lamb wave signals. Due to the complex geometry of the specimen, multiple fatigue cracks were observed at different bolt holes during the fatigue testing. The signals before and after the initiation of the fatigue cracks were compared to calculate the damage index (DI). In general cases, DI can serve an indicator to map the fatigue crack size. In the experiments, it was found that the phase shifts between the baseline signal before fatigue crack initiates, Sb(t), and the signal with fatigue cracks, S(t), can result in an overestimated DI. To solve this problem, the envelope damage index (EDI) was introduced to monitor the fatigue cracks. The envelope curves of Sb and S are considered in the calculation of EDI. In the experiments, three specimens were prepared for fatigue testing. Crack-size observations of the specimens indicated that the EDI is a better parameter than DI for monitoring the fatigue crack size and location.
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U2 - 10.1061/(ASCE)AS.1943-5525.0001499
DO - 10.1061/(ASCE)AS.1943-5525.0001499
M3 - Article
AN - SCOPUS:85138722996
SN - 0893-1321
VL - 35
JO - Journal of Aerospace Engineering
JF - Journal of Aerospace Engineering
IS - 6
M1 - 04022101
ER -