Abstract
Structural health monitoring has focused on the use of computational models to capture the effect of crack-like discontinuities on the behaviour of acoustic-ultrasonic signals. However, few models have taken into account the effect of geometric complexity in combination with residual stresses generated during the fatigue crack growth (FCG) process. In this study, a finite element analysis model of a C-channel type aeronautical structure is evaluated under a pitch-catch scenario. Three different finite element model configurations were considered in order to understand the effects that residual stresses of a fatigue crack emanating from a through-hole have on the guided Lamb wave propagation behaviour. The results demonstrate that numerical modelling is able to capture the change in amplitude and the effect of a phase shift on the guided Lamb wave behaviour due to the presence of the discontinuity and the stress field generated during the FCG process.
Original language | English |
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Article number | 115004 |
Number of pages | 24 |
Journal | Smart Materials and Structures |
Volume | 26 |
Issue number | 11 |
DOIs | |
Publication status | Published - 29 Sept 2017 |
Keywords
- acoustic-ultrasonic
- complex structures
- fatigue crack growth
- guided lamb wave
- propagation
- residual stress field
- structural health monitoring