Abstract
The present work explores the use of nonlinear resonance spectroscopy to detect early fatigue damage in carbon fiber-epoxy composite laminates. The objective is to test composite samples at mid to high cycle fatigue (>10∧3 cycles), so that the damage evolution could be tracked. The nondestructive nature of the testing method ensures that the sample can be loaded and tested till failure, i.e. interrupted fatigue testing. The acoustic nonlinear response tracked over the fatigue life of the sample includes, the nonlinear frequency shift and modal damping ratio. Additionally, slow dynamic diagnostics was also carried out to investigate the recovery rate and recovery time. The samples that were tested were all quasi-isotropic laminates under 4-point bending load. These included a pristine sample, and two samples with impact damage to introduce variability. Tracking the nonlinear parameters over fatigue life showed a non-monotonic increase in nonlinearity. Conjectures based on acoustic response to microdamage and different stages of fatigue were used to explain the observed variation.
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