Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/64328
Title: Analytical modeling of contact acoustic nonlinearity of guided waves and its application to evaluating severity of fatigue damage
Authors: Wang, K
Su, ZQ 
Issue Date: 2016
Publisher: SPIE-International Society for Optical Engineering
Source: Proceedings of SPIE : the International Society for Optical Engineering, 2016, v. 9805, 98050L How to cite?
Journal: Proceedings of SPIE : the International Society for Optical Engineering 
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.
Description: Conference on Sensors and Smart Structures Technology for Civil, Mechanical and Aerospace Applications 2016, Las Vegas, USA, 20-24 March, 2016
URI: http://hdl.handle.net/10397/64328
ISSN: 0277-786X
EISSN: 1996-756X
DOI: 10.1117/12.2218705
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