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Proceedings Paper

Analytical modeling of contact acoustic nonlinearity of guided waves and its application to evaluating severity of fatigue damage
Author(s): Kai Wang; Zhongqing Su
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Paper Abstract

Targeting quantitative estimate of fatigue damage, a dedicated analytical model was developed based on the modal decomposition method and the variational principle. The model well interprets the contact acoustic nonlinearity induced by a “breathing” crack in a two-dimensional scenario, and the nonlinear characteristics of guided ultrasonic waves (GUWs) (e.g., reflection, transmission, mode conversion and high-order generation) when GUWs traversing the crack. Based on the model, a second-order reflection index was defined. Using the index, a fatigue damage evaluation framework was established, showing demonstrated capacity of estimating the severity of fatigue damage in a quantitative manner. The approach, in principle, does not entail a benchmarking process against baseline signals pre-acquired from pristine counterparts. The results obtained using the analytical modeling were compared with those from finite element simulation, showing good coincidence. Limitations of the model were also discussed.

Paper Details

Date Published: 1 April 2016
PDF: 13 pages
Proc. SPIE 9805, Health Monitoring of Structural and Biological Systems 2016, 98050L (1 April 2016); doi: 10.1117/12.2218705
Show Author Affiliations
Kai Wang, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Zhongqing Su, The Hong Kong Polytechnic Univ. (Hong Kong, China)

Published in SPIE Proceedings Vol. 9805:
Health Monitoring of Structural and Biological Systems 2016
Tribikram Kundu, Editor(s)

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