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Title: An insight into high-order harmonic generation of lamb waves induced by a breathing crack using a spring model and a local interaction simulation approach
Authors: Radecki, RZ
Su, Z 
Cheng, L 
Issue Date: 2015
Publisher: Destech Publications
Source: In FK Chang & F Kopsaftopoulos (Eds.), Structural health monitoring 2015 : system reliability for verification and implementation, p. 1798-1805. Lancaster, Pa. : Destech Publications, 2015 How to cite?
Abstract: The study and use of high-order harmonic generation is the core of recent research conducted regarding Lamb wave-based identification of undersized damage. A numerical study was performed using a Local Interaction Simulation Approach (LISA) to explore the characteristics of high-order harmonic generation of Lamb waves propagating in a medium containing a “breathing” crack. In order to faithfully model the “breathing” pattern of the crack, a Spring Model (SM) was developed, as a spin-off of LISA. The SM substitutes the mechanism of local interaction between waves and the crack to an equivalent set of “tensorial springs”. Using LISA in conjunction with SM, a quantitative insight into the high-order harmonic generation induced by a “breathing” crack of various depths was achieved. It has been demonstrated that the developed model is capable of simulating the non-contact and flawed interface behavior of the “breathing” crack under dynamic loads. In addition, a damage index was established based on the high-order harmonic generation, showing dependence on the depth of the “breathing” crack at different excitation frequencies.
Description: The 10th International Workshop on Structural Health Monitoring (IWSHM), Stanford, CA, Sept. 1-3, 2015
ISBN: 978-1-60595-111-9 (print)
DOI: 10.12783/SHM2015/224
Appears in Collections:Conference Paper

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