Abstract
In this article, a method for addressing temperature effects using Lamb waves is developed with application to baseline comparison damage detection. The proposed method is based on baseline signal stretch with an improved minimum residual allowing correction over a larger temperature range. The effectiveness of the proposed approach in detecting (artificial) damages is demonstrated experimentally over a large temperature. The method is also shown to accurately detect and localise a crack in an aluminium panel and actual impact damage on a carbon fibre reinforced polymer panel.
Highlights
Structural health monitoring (SHM) is an emerging branch of non-destructive testing (NDT), which can provide a real-time in situ alternative to classical NDT methods
SHM methods could potentially allow for adoption of lighter composite materials through early detection of barely visible impact damage (BVID) in carbon fibre reinforced polymer (CFRP) materials
Guided wave SHM principally relies on ultrasonic wave propagation in plate-like mediums and by analysing diagnostic waves it is possible to interpret the health of a structure
Summary
Structural health monitoring (SHM) is an emerging branch of non-destructive testing (NDT), which can provide a real-time in situ alternative to classical NDT methods. The ultimate aim of active SHM for aerospace application would be to detect structural damage, characterise severity and location, in real time under operational environmental conditions. Guided waves are of interest in SHM applications due to Lamb waves’ relative ease of activation and the ability to interrogate large areas with transducers. These waves can form when the wavelength is of the same order as the plate thickness. Depending on the frequency of actuation and the thickness of the structure, many Lamb wave modes can be activated with velocity being dependant on both of these parameters. Lead zirconate titanate (PZT) transducers provide an effective solution to both actuation and sensing by exploiting the direct and inverse piezoelectric effects
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