A damage characterization approach was developed in this study by exploiting the second harmonics generated owing to the interaction between incident Lamb waves and a "breathing" crack. The approach can be expanded to deployment of structural health monitoring, whereby fatigue cracks in a plate-like structure can be evaluated quantitatively. A dedicated analytical model, in conjunction with the use of a variational principle-based method and an elasto-dynamic reciprocity method, was established. Using the model, an insight into the modulation mechanism of the crack on Lamb wave propagation was achieved, and the contact acoustic nonlinearity (CAN)-induced second harmonic generation was interrogated. Two scenarios were considered in which the plate bearing a "breathing" crack was modelled in two-dimensional and three-dimensional scenarios, respectively, yielding a quantitative correlation between crack parameters and second harmonic-based nonlinearity index. Results obtained from the proposed approach were compared with those from finite element simulation, to observe good coincidence.
|Title of host publication||8th European Workshop on Structural Health Monitoring, EWSHM 2016|
|Number of pages||10|
|Publication status||Published - 1 Jan 2016|
|Event||8th European Workshop on Structural Health Monitoring, EWSHM 2016 - Bilbao, Spain|
Duration: 5 Jul 2016 → 8 Jul 2016
|Conference||8th European Workshop on Structural Health Monitoring, EWSHM 2016|
|Period||5/07/16 → 8/07/16|
- Contact acoustic nonlinearity (CAN)
- Fatigue crack
- Second harmonic generation
- Structural health monitoring.
ASJC Scopus subject areas
- Health Information Management
- Computer Science Applications