Assessment of correlation-based imaging technique on composites
Abstract »In Structural Health Monitoring, the implementation of model-based imaging techniques regarding detection, positioning and sizing capabilities still poses a challenge for composite assemblies. Current techniques are limited by their model assumptions, that don’t fully consider the effect of anisotropy on guided wave generation and propagation. This article presents the potential of a two-step procedure based on a correlation-based model, used both to identify the mechanical properties of a laminate and detect damage. The modelling of the wave generation is considered using the pin-force model, and the Global Matrix Method (GMM), based on the 3D elasticity theory, is used to model the wave propagation in a composite structures. The performance of the technique is first demonstrated numerically for a unidirectional laminate, and then experimentally for a unidirectional laminate. Results show the strong potential of such a technique for damage detection, even on substrates where the anisotropy has a strong effect on guided wave generation and propagation.